Independent Bank (INDB) 10-K 28 Feb 19 2018 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2018	Feb. 25, 2019
Document and Entity Information [Abstract]
Entity Registrant Name	Independent Bank Corp
Entity Central Index Key	776,901
Document Type	10-K
Document Period End Date	Dec. 31, 2018
Amendment Flag	false
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	FY
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Public Float	$ 2,113,770,437
Entity Common Stock, Shares Outstanding	28,080,000	28,121,819
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Assets
Cash and due from banks	$ 127,503	$ 103,485
Interest-earning deposits with banks	122,952	109,631
Securities
Debt Securities, Trading, and Equity Securities, FV-NI	1,504	1,324
Equity Securities, FV-NI	19,477	0
Debt Securities, Available-for-sale	442,752	447,498
Held to maturity (fair value $603,640 and $494,194)	611,490	497,688
Total securities	1,075,223	946,510
Loans held for sale (at fair value)	6,431	4,768
Loans
Commercial and industrial		888,528
Commercial real estate		3,116,561
Commercial construction		401,797
Small business		132,370
Residential real estate		754,329
Loans and Leases Receivable Consumer Home Equity in First Position	654,083	612,990
Loans and Leases Receivable Consumer Home Equity in Subordinated Position	438,001	439,098
Other consumer		9,880
Total loans	6,906,194	6,355,553
Less: allowance for loan losses	(64,293)	(60,643)
Net loans	6,841,901	6,294,910
Federal Home Loan Bank stock	15,683	11,597
Bank premises and equipment, net	97,581	94,722
Goodwill	256,105	231,806
Other intangible assets	15,250	9,341
Cash surrender value of life insurance policies	160,456	151,528
Other real estate owned and other foreclosed assets		612
Other assets	132,507	123,119
Total assets	8,851,592	8,082,029
Deposits
Demand deposits	2,450,907	2,159,396
Savings and interest checking accounts	2,865,349	2,599,922
Money market	1,399,761	1,325,634
Time certificates of deposit of $100,000 and over	351,629	278,531
Other time certificates of deposits	359,474	365,770
Total deposits	7,427,120	6,729,253
Borrowings
Advances from Federal Home Loan Banks	147,806	53,264
Junior subordinated debentures (less unamortized debt issuance costs of $118 and $125)	76,173	73,073
Subordinated debentures (less unamortized debt issuance costs of $272 and $318)	34,728	34,682
Securities Sold under Agreements to Repurchase	0	162,679
Total borrowings	258,707	323,698
Other liabilities	92,275	85,269
Total liabilities	7,778,102	7,138,220
Commitments and contingencies	0	0
Stockholders' Equity
Preferred stock, $.01 par value; authorized: 1,000,000 shares, outstanding: none	0	0
Common stock, $.01 par value; authorized: 75,000,000 shares, issued and outstanding: 28,080,408 shares at December 31, 2018 and 27,450,190 shares at December 31, 2017 (includes 153,459 and 177,191 shares of unvested participating restricted stock awards, respectively)	279	273
Value of shares held in rabbi trust at cost: 153,226 shares at December 31, 2018 and 164,438 shares at December 31, 2016	(4,718)	(4,590)
Compensation and Benefits Trust	4,718	4,590
Additional paid in capital	527,648	479,430
Retained earnings	546,736	465,937
Accumulated other comprehensive loss, net of tax	(1,173)	(1,831)
Total stockholders' equity	1,073,490	943,809
Liabilities and Equity	$ 8,851,592	$ 8,082,029

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Time certificates of deposit least amount	$ 100,000	$ 100,000
Securities held to maturity, fair value	$ 603,640,000	$ 494,194,000
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	75,000,000	75,000,000
Common stock, shares issued	28,080,408	27,450,190
Common stock, unvested restricted Stock awards	153,459	177,191
Shares held in rabbit trust at cost	153,226	164,438
Common Stock Outstanding
Common stock, shares outstanding	28,080,408	27,450,190
Junior Subordinated Debt [Member]
Unamortized Debt Issuance Expense	$ 118,000,000	$ 125,000,000
Subordinated Debt [Member]
Unamortized Debt Issuance Expense	$ 272,000,000	$ 318,000,000

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Interest income
Interest and fees on loans	$ 294,293,000	$ 253,131,000	$ 224,244,000
Interest Income, Securities, Operating, Taxable	26,513,000	22,465,000	20,851,000
Nontaxable interest and dividends on securities	60,000	88,000	117,000
Interest on loans held for sale	159,000	92,000	235,000
Interest on federal funds sold and short-term investments	2,676,000	1,418,000	1,190,000
Total interest and dividend income	323,701,000	277,194,000	246,637,000
Interest expense
Interest on deposits	19,995,000	12,702,000	11,140,000
Interest on borrowings	5,541,000	5,632,000	7,653,000
Total interest expense	25,536,000	18,334,000	18,793,000
Net interest income	298,165,000	258,860,000	227,844,000
Provision (benefit)	4,775,000	2,950,000	6,075,000
Net interest income after provision for loan losses	293,390,000	255,910,000	221,769,000
Noninterest income
Deposit account fees	18,327,000	17,822,000	18,652,000
Interchange and ATM fees	18,916,000	17,291,000	16,210,000
Investment Banking, Advisory, Brokerage, and Underwriting Fees and Commissions	26,155,000	23,802,000	21,809,000
Fees and Commission Mortgage Banking	4,071,000	4,960,000	6,607,000
Increase in cash surrender value of life insurance policies	4,060,000	4,127,000	4,089,000
Gain Realized on Life Insurance Policies	1,463,000	0
Loan level derivative income	2,373,000	3,836,000	6,155,000
Other noninterest income	13,140,000	11,156,000	8,906,000
Total noninterest income	88,505,000	82,994,000	82,428,000
Noninterest expenses
Salaries and employee benefits	124,328,000	116,600,000	108,636,000
Occupancy and equipment expenses	27,098,000	24,693,000	22,867,000
Data processing & facilities management	5,125,000	4,988,000	4,975,000
FDIC assessment	2,774,000	3,068,000	3,380,000
Advertising expense	4,942,000	4,989,000	5,202,000
Consulting expense	3,891,000	4,038,000	3,486,000
Debit Card Expense	3,429,000	3,430,000	2,993,000
Gains (Losses) on Extinguishment of Debt	0	0	437,000
Merger and acquisition expense	11,168,000	3,393,000	5,455,000
Software Maintenance	4,202,000	3,636,000	3,061,000
Other noninterest expenses	39,012,000	35,524,000	31,630,000
Total noninterest expenses	225,969,000	204,359,000	192,122,000
Income before income taxes	155,926,000	134,545,000	112,075,000
Provision for income taxes	34,304,000	47,341,000	35,427,000
Net Income	$ 121,622,000	$ 87,204,000	$ 76,648,000
Basic earnings per share (in dollars per share)	$ 4.41	$ 3.19	$ 2.90
Diluted earnings per share (in dollars per share)	$ 4.40	$ 3.19	$ 2.90
Weighted average common shares (basic) (in shares)	27,592,380	27,294,028	26,404,071
Common share equivalents (in shares)	61,428	78,076	51,847
Weighted average common shares (diluted) (in shares)	27,653,808	27,372,104	26,455,918
Retained Earnings
Noninterest expenses
Net Income	$ 121,622,000	$ 87,204,000	$ 76,648,000
Cash dividends declared (in dollars per share)	$ 1.52	$ 1.28	$ 1.16

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income		$ 121,622	$ 87,204	$ 76,648
Other comprehensive income (loss), net of tax
Net change in fair value of securities available for sale		(4,501)	(677)	(1,133)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax		4,829	443	2,170
Net change in other comprehensive income for defined benefit postretirement plans	[1]	1,558	(260)	78
Total other comprehensive income (loss)		1,886	(494)	1,115
Total comprehensive income		$ 123,508	$ 86,710	$ 77,763
[1]	The amortization of prior service costs is included in the computation of net periodic pension costs as disclosed in Note 15 - Employee Benefit Plans .

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands		Total		Common Stock Outstanding	Common Stock	Value of Shares Held in Rabbi Trust at Cost	Deferred Compensation Obligation	Additional Paid in Capital	Retained Earnings		Accumulated Other Comprehensive Loss
Beginning balance at Dec. 31, 2015		$ 771,463			$ 260	$ (3,958)	$ 3,958	$ 405,486	$ 368,169		$ (2,452)
Beginning balance (in shares) at Dec. 31, 2015				26,236,352
Net income		76,648							$ 76,648
Other comprehensive income		1,115									1,115
Common Stock, Dividends, Per Share, Declared									$ 1.16
Common dividend declared		(30,722)							$ (30,722)
Common stock issued for acquisition		40,730			7			40,723
Common stock issued for acquisition (in shares)				672,665
Proceeds from exercise of stock options, net of cash paid		201						201
Proceeds from exercise of stock options (in shares)				13,449
Tax benefit related to equity award activity		476						476
Stock based compensation		2,965						2,965
Restricted stock awards issued, net of awards surrendered (in shares)				33,432
Restricted stock awards issued, net of awards surrendered		(696)			1			(697)
Stock Issued During Period, Shares, Other				49,915
Stock Issued During Period, Value, Other		2,323						2,323
Increase (Decrease) in Deferred Compensation						(319)	319
Tax benefit related to deferred compensation distributions		187						187
Ending balance (in shares) at Dec. 31, 2016				27,005,813
Ending balance at Dec. 31, 2016		864,690			268	(4,277)	4,277	451,664	414,095		(1,337)
Net income		87,204							$ 87,204
Other comprehensive income		(494)									(494)
Common Stock, Dividends, Per Share, Declared									$ 1.28
Common dividend declared		(34,997)							$ (34,997)
Common stock issued for acquisition		23,468			4			23,464
Common stock issued for acquisition (in shares)				369,286
Proceeds from exercise of stock options, net of cash paid		214			0			214
Proceeds from exercise of stock options (in shares)				19,340
Stock based compensation		3,333						3,333
Restricted stock awards issued, net of awards surrendered (in shares)				31,665
Restricted stock awards issued, net of awards surrendered		(1,422)			1			(1,423)
Stock Issued During Period, Shares, Other				24,086
Stock Issued During Period, Value, Other		1,636						1,636
Increase (Decrease) in Deferred Compensation		0				(313)	313
Ending balance (in shares) at Dec. 31, 2017				27,450,190
Ending balance at Dec. 31, 2017		943,809			273	(4,590)	4,590	479,430	465,937		(1,831)
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets	[1]	177						542	(365)
Prior Period Reclassification Adjustment		0	[2]						397	[3]	(397)	[3]
Net income		121,622							$ 121,622
Other comprehensive income		1,886									1,886
Common Stock, Dividends, Per Share, Declared									$ 1.52
Common dividend declared		(42,051)							$ (42,051)
Common stock issued for acquisition		42,474			5			42,469
Common stock issued for acquisition (in shares)				528,353
Proceeds from exercise of stock options, net of cash paid		184						184
Proceeds from exercise of stock options (in shares)				23,195
Stock based compensation		4,225						4,225
Restricted stock awards issued, net of awards surrendered (in shares)				43,383
Restricted stock awards issued, net of awards surrendered		(1,371)			1			(1,372)
Stock Issued During Period, Shares, Other				35,287
Stock Issued During Period, Value, Other		2,712						2,712
Increase (Decrease) in Deferred Compensation and Other Retirement Benefits						(128)	128
Ending balance (in shares) at Dec. 31, 2018				28,080,408
Ending balance at Dec. 31, 2018		1,073,490			$ 279	$ (4,718)	$ 4,718	$ 527,648	546,736		(1,173)
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets		$ 0	[3]						$ 831	[2]	$ (831)	[2]
[1]	Represents adjustment needed to reflect the cumulative impact on retained earnings for previously recognized stock based compensation, which included an adjustment for estimated forfeitures. Pursuant to the Company's adoption of Accounting Standards Update 2016-09, the Company has elected to recognize stock based compensation without inclusion of a forfeiture estimate, and as such has recognized this adjustment to present retained earnings consistent with this election.
[2]	Represents adjustment needed to reflect the cumulative impact on retained earnings for the classification and measurement of investments in equity securities. Pursuant to the Company's adoption of Accounting Standards Update 2016-01, the Company's investments in equity securities will no longer be classified as available for sale, therefore the Company was required to reclassify the net unrealized gain recognized on the change in fair value of these equity securities from other comprehensive income to retained earnings.
[3]	Represents adjustment needed to reflect the cumulative impact on retained earnings for reclassification of the income tax effects attributable to accumulated other comprehensive income, as a result of the Tax Cuts and Jobs Act (the "Tax Act"). Pursuant to the Company's adoption of Accounting Standards Update 2018-02, the Company has elected to reclassify amounts stranded in other comprehensive income to retained earnings.

Consolidated Statements of Cash

Consolidated Statements of Cash Flows	12 Months Ended
	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Cash flow from operating activities
Net income	$ 121,622,000	$ 87,204,000	$ 76,648,000
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	15,994,000	15,681,000	14,354,000
Provision for loan losses	4,775,000	2,950,000	6,075,000
Deferred income tax expense (benefit)	(4,497,000)	9,211,000	(5,000)
Tax Expense related to a change in tax law	0	466,000	0
Equity Securities, FV-NI, Gain (Loss)	1,225,000
Loss on write-down of investments in securities available for sale		(3,000)	26,000
Net (gain) loss on bank premises and equipment	(1,126,000)	(108,000)	114,000
Net loss on other real estate owned and foreclosed assets	112,000	288,000	29,000
Realized gain on sale leaseback transaction	(730,000)	(1,034,000)	(1,034,000)
Stock based compensation	4,225,000	3,333,000	2,965,000
Excess tax benefit related to equity award activity	0	0	(476,000)
Increase in cash surrender value of life insurance policies	(4,060,000)	(4,127,000)	(4,089,000)
Gain Realized on Life Insurance Policies	(1,463,000)	0
Change in Fair Value on Loans Held for Sale	51,000	113,000	(87,000)
Net change in:
Trading assets	(180,000)	(520,000)	(448,000)
Loans held for sale	(1,714,000)	1,258,000	(62,000)
Other assets	503,000	20,022,000	7,627,000
Other liabilities	7,100,000	(3,825,000)	(8,738,000)
Total adjustments	20,215,000	43,705,000	16,251,000
Net cash provided by operating activities	141,837,000	130,909,000	92,899,000
Cash flows used in investing activities
Proceeds from Sale of Debt and Equity Securities, FV-NI, Held-for-investment	5,752,000
Increase (Decrease) in Equity Securities, FV-NI	(6,315,000)	0	0
Proceeds from Sale of Available-for-sale Securities, Equity		0	0
Proceeds from Sale of Debt Securities, Available-for-sale		1,027,000	618,000
Proceeds from maturities and principal repayments of securities available for sale	82,418,000	54,191,000	69,775,000
Payments to Acquire Debt Securities, Available-for-sale	(78,990,000)	(140,885,000)	(69,671,000)
Proceeds from maturities and principal repayments of securities held to maturity	82,355,000	78,757,000	90,991,000
Purchases of securities held to maturity	(195,538,000)	(89,033,000)	(100,198,000)
Net redemption (purchases) of Federal Home Loan Bank stock	(2,376,000)	386,000	5,229,000
Investments in low income housing projects	(3,434,000)	(7,645,000)	(7,626,000)
Purchases of life insurance policies	(164,000)	(164,000)	(163,000)
Proceeds from Life Insurance Policy	2,850,000	0	0
Net increase in loans	(258,633,000)	(204,702,000)	(227,838,000)
Cash Acquired in Excess of Payments to Acquire Business		6,289,000	8,668,000
Net cash acquired (paid) in business combinations	(6,906,000)
Purchases of bank premises and equipment	(11,106,000)	(25,080,000)	(10,395,000)
Proceeds from the sale of bank premises and equipment	2,189,000	6,306,000	345,000
Proceeds from the sale of other real estate owned and foreclosed assets	387,000	3,784,000	1,583,000
Net payments relating to other real estate owned and foreclosed assets	0	0	(204,000)
Net cash used in investing activities	(387,511,000)	(316,769,000)	(238,886,000)
Cash flows provided by financing activities
Net decrease in time deposits	(1,430,000)	(19,509,000)	(104,803,000)
Net increase in other deposits	280,017,000	177,241,000	350,739,000
Net proceeds from (repayments of) short-term Federal Home Loan Bank borrowings	67,046,000		(37,000,000)
Repayments of long-term Federal Home Loan Bank borrowings	(2,475,000)	0	(65,791,000)
Net increase (decrease) in customer repurchase agreements	(21,503,000)	(14,234,000)	42,955,000
Gain (Loss) on Extinguishment of Debt	0	0	(437,000)
Net proceeds from exercise of stock options	184,000	214,000	201,000
Restricted stock awards issued, net of awards surrendered	(1,371,000)	(1,422,000)	(696,000)
Excess tax benefit from stock based compensation			476,000
Tax benefit from deferred compensation distribution			187,000
Proceeds from shares issued under the direct stock purchase plan	2,712,000	1,636,000	2,323,000
Common dividends paid	(40,167,000)	(34,045,000)	(29,711,000)
Net cash provided by financing activities	283,013,000	109,881,000	159,317,000
Net increase (decrease) in cash and cash equivalents	37,339,000	(75,979,000)	13,330,000
Cash and cash equivalents at beginning of year	213,116,000	289,095,000	275,765,000
Cash and cash equivalents at end of period	250,455,000	213,116,000	289,095,000
Supplemental schedule of noncash investing and financing activities
Interest on deposits and borrowings	25,337,000	18,626,000	18,963,000
Income taxes	27,809,000	32,865,000	33,473,000
Transfer of loans to other real estate owned and foreclosed assets		511,000	1,322,000
Capital commitment relating to Low Income Housing Project investments, noncash	2,833,000	20,000	5,180,000
Transfer of customer repurchase agreements to deposits noncash	141,176,000	0	0
In conjunction with the Company's acquisitions, assets were acquired and liabilities were assumed as follows
Common stock issued for acquisition	42,474,000	23,468,000	40,730,000
Fair value of assets acquired, net of cash acquired	362,286,000	179,252,000	266,242,000
Fair value of liabilities assumed	$ 312,906,000	$ 162,073,000	$ 234,180,000

SUMMARY OF SIGNIFICANT ACCOUNTI

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	12 Months Ended
	Dec. 31, 2018
Accounting Policies [Abstract]
Significant Accounting Policies [Text Block]	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Nature of Operations Independent Bank Corp. (the “Company”) is a bank holding company whose principal subsidiary is Rockland Trust Company (“Rockland Trust” or the “Bank”). Rockland Trust is a state-chartered commercial bank, which operates eighty-seven full service and two limited service retail branches, thirteen commercial banking centers, eight investment management offices and one mortgage lending center, all of which are located in Eastern Massachusetts, including Cape Cod and Martha's Vineyard, with the exception of an investment management group/commercial lending office located in Providence, Rhode Island. Rockland Trust deposits are insured by the Federal Deposit Insurance Corporation, subject to regulatory limits. The Company’s primary source of income is from providing loans to individuals and small-to-medium sized businesses in its market area. Rockland Trust is a community-oriented commercial bank, and the community banking business is the Company's only reportable operating segment. Principles of Consolidation The consolidated financial statements include the accounts of the Company, the Bank and other wholly-owned subsidiaries, except subsidiaries that are not deemed necessary to be consolidated. All significant intercompany balances and transactions have been eliminated in consolidation. The Company determines whether it has a controlling financial interest in an entity by first evaluating whether the entity is a voting interest entity or a variable interest entity under GAAP. Voting interest entities are entities in which the total equity investment at risk is sufficient to enable the entity to finance itself independently and provides the equity holders with the obligation to absorb losses, the right to receive residual returns and the right to make decisions about the entity’s activities. The Company would consolidate voting interest entities in which it has all, or at least a majority of, the voting interest. As defined in applicable accounting standards, variable interest entities (“VIEs”) are entities that lack one or more of the characteristics of a voting interest entity. A controlling financial interest in a VIE is present when the Company has both the power and ability to direct the activities of the VIE that most significantly impact the VIE's economic performance and an obligation to absorb losses or the right to receive benefits that could potentially be significant to the VIE. The Company also owns the common stock of various trusts which have issued trust preferred securities. These trusts are VIEs in which the Company is not the primary beneficiary and, therefore, are not consolidated. The trust's only assets are junior subordinated debentures issued by the Company, which were acquired by the trust using the proceeds from the issuance of the trust preferred securities and common stock. The junior subordinated debentures are included in long-term debt and the Company’s equity interest in the trust is included in other assets in the accompanying Consolidated Balance Sheets. Interest expense on the junior subordinated debentures is reported in interest expense on long-term debt in the accompanying Consolidated Statements of Income. Reclassification Certain previously reported amounts have been reclassified to conform to the current year’s presentation. Use of Estimates The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America ("GAAP") requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting periods. Actual results could vary from these estimates. Material estimates that are particularly susceptible to significant changes in the near-term relate to the determination of the allowance for loan losses, income taxes, valuation and potential impairment of investment securities, other-than-temporary impairment (“OTTI”) of certain investment securities, as well as valuation of goodwill and other intangibles and their respective analyses of impairment. Significant Concentrations of Credit Risk The vast majority of the Bank’s lending activities are conducted in the Commonwealth of Massachusetts and Rhode Island. The Bank originates commercial and industrial loans, commercial and residential real estate loans, including construction loans, small business loans, home equity loans, and other consumer loans for its portfolio. The Bank considers a concentration of credit to a particular industry to exist when the aggregate credit exposure which includes direct, indirect or contingent obligations to a borrower, an affiliated group of borrowers or a nonaffiliated group of borrowers engaged in one industry, exceeds 10% of the Bank’s loan portfolio. Loans originated by the Bank to lessors of nonresidential buildings represented 15.1% and 15.4% of the total loan portfolio at December 31, 2018 and 2017 , respectively. Within this concentration category, the Company believes it is well diversified among collateral property types and tenant industries. Cash and Cash Equivalents For purposes of reporting cash flows, cash and cash equivalents may include cash on hand, amounts due from banks, inclusive of interest-earning deposits held at banks, and federal funds sold. Generally, federal funds are sold for up to two week periods. Securities Investment securities are classified at the time of purchase as “available for sale,” “held to maturity,” “trading,” or "equity." Classification is constantly re-evaluated for consistency with corporate goals and objectives. Trading and equity securities are recorded at fair value with subsequent changes in fair value recorded in earnings. Debt securities that management has the positive intent and ability to hold to maturity are classified as “held to maturity” and recorded at amortized cost. Securities not classified as held to maturity, trading or equity, are classified as “available for sale” and recorded at fair value, with changes in fair value excluded from earnings and reported in other comprehensive income, net of related tax. Purchase premiums and discounts are recognized in interest income, using the interest method, to arrive at periodic interest income at a constant effective yield, thereby reflecting the securities market yield. Gains and losses on the sale of securities are recorded on the trade date and are determined using the specific identification method. Declines in the fair value of held to maturity and available for sale securities below their amortized cost deemed to be OTTI are written down to fair value as determined by a cash flow analysis. To the extent the estimated cash flows do not support the amortized cost, the deficiency is considered to be due to credit loss and recognized in earnings. Unless the Company intends to sell the security, or if it is more likely than not that the Company will be required to sell the debt security before its anticipated recovery, the remainder of the OTTI charge is considered to be due to other factors, such as liquidity or interest rates, and thus is not recognized in earnings, but rather through other comprehensive income, net of related tax. The Company evaluates individual securities that have fair values below cost for six months or longer, or for a shorter period of time if considered appropriate by management, to determine if the decline in fair value is other-than-temporary. Consideration is given to the obligor of the security, whether the security is guaranteed, whether there is a projected adverse change in cash flows, the liquidity of the security, the type of security, the capital position of security issuers, and payment history of the security, amongst other factors when evaluating such securities. Loans Held for Sale The Bank primarily classifies new residential real estate mortgage loans as held for sale based on intent, which is determined when loans are underwritten. Residential real estate mortgage loans not designated as held for sale are retained based upon available liquidity, for interest rate risk management and other business purposes. The Company has elected the fair value option to account for originated closed loans intended for sale. Accordingly, changes in fair value relating to loans intended for sale are recorded in earnings and are offset by changes in fair value relating to interest rate lock commitments and forward sales commitments. Gains and losses on residential loan sales (sales proceeds minus carrying amount) are recorded in mortgage banking income. Upfront costs and fees related to items for which the fair value option is elected are recognized in earnings as incurred and are not deferred. Loans Loans are carried at the principal amounts outstanding, or amortized acquired fair value in the case of acquired loans, adjusted by partial charge-offs and net of deferred loan costs or fees. For originated loans, loan fees and certain direct origination costs are deferred and amortized into interest income over the expected term of the loan using the level-yield method. When a loan is paid off, the unamortized portion is recognized in interest income. Interest income on loans is accrued based upon the daily principal amount outstanding except for loans on nonaccrual status. For acquired loans which did not show signs of credit deterioration at acquisition, interest income is also accrued based upon the daily principal amount outstanding and is then further adjusted by the accretion of any discount or amortization of any premium associated with the loan. As a general rule, loans more than 90 days past due with respect to principal or interest are classified as nonaccrual loans, or sooner if management considers such action to be prudent. However, loans that are more than 90 days past due may be kept on an accruing status if the loan is well secured and in the process of collection. The Company may also put a junior lien mortgage on nonaccrual status as a result of delinquency with respect to the first position, which is held by the Bank or by another financial institution, while the junior lien is currently performing. Income accruals are suspended on all nonaccrual loans and all previously accrued and uncollected interest is reversed against current income. A loan remains on nonaccrual status until it becomes current with respect to principal and interest (and in certain instances remains current for up to six months), the loan is liquidated, or when the loan is determined to be uncollectible and is charged-off against the allowance for loan losses. When doubt exists as to the collectability of a loan, any payments received are applied to reduce the recorded investment in the asset to the extent necessary to eliminate such doubt. For all loan portfolios, a charge-off occurs when the Company determines that a specific loan, or portion thereof, is uncollectible. This determination is made based on management's review of specific facts and circumstances of the individual loan, including assessing the viability of the customer’s business or project as a going concern, the expected cash flows to repay the loan, the value of the collateral and the ability and willingness of any guarantors to perform. In cases where a borrower experiences financial difficulties and the Company makes certain concessionary modifications to contractual terms, the loan is classified as a troubled debt restructuring (“TDR”). Modifications may include adjustments to interest rates, extensions of maturity, consumer loans where the borrower's obligations have been effectively discharged through Chapter 7 Bankruptcy and the borrower has not reaffirmed the debt to the Bank, and other actions intended to minimize economic loss and avoid foreclosure or repossession of collateral. The recorded investment of loans classified as TDRs is adjusted to reflect the changes in value, if any, resulting from the granting of a concession. Nonaccrual loans that are restructured remain on nonaccrual for a period of six months to demonstrate that the borrower can meet the restructured terms. If the restructured loan is on accrual status prior to being modified, it is reviewed to determine if the modified loan should remain on accrual status. If the borrower’s ability to meet the revised payment schedule is not reasonably assured, the loan is classified as a nonaccrual loan. Loans classified as TDRs remain classified as such for the life of the loan, except in limited circumstances, when it is determined that the borrower is performing under the modified terms and the restructuring agreement specified an interest rate greater than or equal to an acceptable market rate for a comparable new loan at the time of the restructuring. Acquired loans All acquired loans are recorded at fair value with no carryover of the allowance for loan losses. At acquisition, loans are also reviewed to determine if the loan has evidence of deterioration in credit quality and to review if it is probable, at acquisition, that all contractually required payments will not be collected. Such loans are deemed to be purchased credit impaired ("PCI") loans. Under the accounting model for PCI loans, the excess of cash flows expected to be collected over the carrying amount of the loans, referred to as the "accretable yield", is accreted into interest income over the life of the loans using the effective yield method. Accordingly, PCI loans are not subject to classification as nonaccrual in the same manner as originated loans. Rather, acquired loans are generally considered to be accruing loans because their interest income relates to the accretable yield recognized and not to contractual interest payments at the loan level. The difference between contractually required principal and interest payments and the cash flows expected to be collected, referred to as the "nonaccretable difference", includes estimates of both the impact of prepayments and future credit losses expected to be incurred over the life of the loans. The estimate of cash flows expected to be collected is regularly re-assessed subsequent to acquisition. These re-assessments involve updates, as necessary, of the key assumptions and estimates used in the initial estimate of fair value. Generally speaking, expected cash flows are affected by: • Changes in the expected principal and interest payments over the estimated life - Changes in expected cash flows may be driven by the credit outlook and actions taken with borrowers. Changes in expected future cash flows resulting from loan modifications are included in the assessment of expected cash flows. • Change in prepayment assumptions - Prepayments affect the estimated life of the loans, which may change the amount of interest income expected to be collected. • Change in interest rate indices for variable rate loans - Expected future cash flows are based, as applicable, on the variable rates in effect at the time of the assessment of expected cash flows. A decrease in expected cash flows in subsequent periods may indicate that the loan is impaired which would likely require the recognition of a charge-off against the allowance for loan losses or an establishment of a specific reserve. An increase in expected cash flows in subsequent periods serves, first, to reduce any previously established specific reserve by the increase in the present value of cash flows expected to be collected. Any increase above the previously established specific reserve results in a recalculation of the amount of accretable yield for the loan. The adjustment of accretable yield due to an increase in expected cash flows is accounted for as a change in estimate. The additional cash flows expected to be collected are reclassified from the nonaccretable difference to the accretable yield, and the amount of periodic accretion is adjusted accordingly over the remaining life of the loans. A PCI loan may be resolved either through receipt of payment (in full or in part) from the borrower, the sale of the loan to a third party, or foreclosure of the collateral. In the event of a sale of the loan, a gain or loss on sale would be recognized and reported within noninterest income based on the difference between the sales proceeds and the carrying amount of the loan. For PCI loans accounted for on an individual loan basis and resolved directly with the borrower, any amount received from resolution in excess of the carrying amount of the loan is recognized and reported within interest income. A refinancing or modification of a PCI loan accounted for individually is assessed to determine whether the modification represents a TDR. If the loan is considered to be a TDR, it will be included in the total impaired loans reported by the Company. The loan will continue to recognize interest income based upon the excess of cash flows expected to be collected over the carrying amount of the loan. Allowance for Loan Losses The allowance for loan losses is established based upon the level of estimated probable losses in the current loan portfolio. Loan losses are charged against the allowance when management believes the collectability of a loan balance is doubtful. Subsequent recoveries, if any, are credited to the allowance. The allowance for loan losses is allocated to loan types using both a formula-based approach applied to groups of loans and an analysis of certain individual loans for impairment. The formula-based approach emphasizes loss factors derived from actual historical portfolio loss rates, which are combined with an assessment of certain qualitative factors to determine the allowance amounts allocated to the various loan categories. Allowance amounts are determined based on an estimate of the historical average annual percentage rate of loan loss for each loan category, an estimate of the incurred loss emergence and confirmation period for each loan category, and certain qualitative risk factors considered in the computation of the allowance for loan losses. The qualitative risk factors impacting the inherent risk of loss within the portfolio include the following: • National and local economic and business conditions • Level and trend of delinquencies • Level and trend of charge-offs and recoveries • Trends in volume and terms of loans • Risk selection, lending policy and underwriting standards • Experience and depth of management • Banking industry conditions and other external factors • Concentration risk The formula-based approach evaluates groups of loans with common characteristics, which consist of similar loan types with similar terms and conditions, to determine the appropriate allocation within each portfolio section. This approach incorporates qualitative adjustments based upon management’s assessment of various market and portfolio specific risk factors into its formula-based estimate. Due to the imprecise nature of the loan loss estimation process and ever changing conditions, the qualitative risk attributes may not adequately capture amounts of incurred loss in the formula-based loan loss components used to determine the Bank’s analysis of the appropriateness of the allowance for loan losses. The Bank evaluates certain loans within the commercial and industrial, commercial real estate, commercial construction and small business portfolios individually for specific impairment. A loan is considered impaired when, based on current information and events, it is probable that the Bank will be unable to collect the scheduled payments of principal or interest when due according to the contractual terms of the loan agreement. Factors considered by management in determining impairment include payment status, collateral value, contractual interest rates and the probability of collecting scheduled principal and interest payments when due. Loans that experience insignificant payment delays and payment shortfalls generally are not classified as impaired. Loans are selected for evaluation based upon a change in internal risk rating, occurrence of delinquency, loan classification, troubled debt restructuring or nonaccrual status. A specific allowance amount is allocated to an individual loan when such loan has been deemed impaired and when the amount of the probable loss is able to be estimated. Estimates of loss may be determined by the present value of anticipated future cash flows, the loan’s observable fair market value, or the fair value of the collateral, if the loan is collateral dependent. However, for collateral dependent loans, the amount of the recorded investment in a loan that exceeds the fair value of the collateral less costs to sell is charged-off against the allowance for loan losses in lieu of an allocation of a specific allowance amount when such an amount has been identified definitively as uncollectible. Large groups of small-balance homogeneous loans such as the residential real estate, residential construction, home equity and other consumer portfolios are collectively evaluated for impairment. As such, the Bank does not typically identify individual loans within these groupings as impaired loans for impairment evaluation and disclosure. However, the Bank evaluates all TDRs for impairment on an individual loan basis regardless of loan type. In the ordinary course of business, the Bank enters into commitments to extend credit, commercial letters of credit, and standby letters of credit. Such financial instruments are recorded in the financial statements when they become payable. The credit risk associated with these commitments is evaluated in a manner similar to the allowance for loan losses. The reserve for unfunded lending commitments is included in other liabilities in the balance sheet. At December 31, 2018 and 2017 , the reserve for unfunded loan commitments was $1.3 million and $972,000 , respectively. Transfers and Servicing of Financial Assets Transfers of financial assets are accounted for as sales when control over the assets has been surrendered. Control over transferred assets is deemed to be surrendered when (1) the assets have been isolated from the Company, (2) the transferee obtains the right (free of conditions that constrain it from taking advantage of that right) to pledge or exchange the transferred assets, and (3) the Company does not maintain effective control over the transferred assets through an agreement to repurchase them before their maturity. Loans held for sale are generally sold with servicing rights released, however if rights are retained, servicing assets are recognized as separate assets. Servicing rights are originally recorded at fair value within other assets, but subsequently are amortized in proportion to and over the period of estimated net servicing income, and are assessed for impairment at each reporting date. Fair value is based on market prices for comparable mortgage servicing contracts, when available, or alternatively, is based on a valuation model that calculates the present value of estimated future net servicing income. The valuation model incorporates assumptions that market participants would use in estimating future net servicing income, such as the cost to service, the discount rate, the custodial earnings rate, an inflation rate, ancillary income, prepayment speeds, default rates and losses. Impairment is determined by stratifying the rights based on predominant characteristics, such as interest rate, loan type and investor type. Impairment is recognized through a valuation allowance, to the extent that fair value is less than the capitalized amount. If the Company later determines that all or a portion of the impairment no longer exists, a reduction of the allowance may be recorded as an increase to income. Servicing fee income is recorded for fees earned for servicing loans for investors. The fees are based on a contractual percentage of the outstanding principal or a fixed amount per loan, and are recorded as income when earned. The amortization of mortgage servicing rights is recorded as a reduction of loan servicing fee income. Federal Home Loan Bank Stock The Company, as a member of the Federal Home Loan Bank (“FHLB”) of Boston, is required to maintain an investment in capital stock of the FHLB. Based on redemption provisions, the stock has no quoted market value and is carried at cost. The Company continually reviews its investment to determine if OTTI exists. The Company reviews recent public filings, rating agency analysis and other factors when making its determination. Bank Premises and Equipment Land is carried at cost. Bank premises and equipment are stated at cost less accumulated depreciation. Depreciation is computed using the straight-line convention method over the estimated useful lives of the assets. Leasehold improvements are amortized over the shorter of the lease terms or the estimated useful lives of the improvements. Expected terms include lease option periods to the extent that the exercise of such options is reasonably assured, not to exceed fifteen years . Goodwill and Other Intangible Assets Goodwill represents the excess of the purchase price over the net fair value of acquired businesses. Goodwill is not amortized and is assigned to one reporting unit. Goodwill is evaluated for impairment at least annually, or more often if warranted, using a combined qualitative and quantitative impairment approach. The initial qualitative approach assesses whether the existence of events or circumstances led to a determination that it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If, after assessing the totality of events and circumstances, the Company determines it is more likely than not that the fair value is less than carrying value, the two step quantitative impairment test is performed. Step one of the quantitative impairment test compares book value to the fair value of the reporting unit. If step one is failed, a detailed step two analysis is performed, which involves measuring the excess of the fair value of the reporting unit, as determined in step one, over the aggregate fair value of the individual assets, liabilities, and identifiable intangibles as if the reporting unit was being acquired in a business combination. Other intangible assets subject to amortization consist of core deposit intangibles, noncompete agreements, customer lists and market-based favorable or unfavorable lease positions at time of acquisition, and are amortized over the estimated lives of the intangibles using a method that approximates the amount of economic benefits that are realized by the Company. Other intangible assets are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of the assets may not be recoverable. The range of useful lives is as follows: Core deposit intangibles 10 years Noncompete agreements 1-3 years Customer Lists 12 years Leases 3-30 years The determination of which intangible assets have finite lives is subjective, as is the determination of the amortization period for such intangible assets. Impairment of Long-Lived Assets Other Than Goodwill The Company reviews long-lived assets, including premises and equipment, for impairment whenever events or changes in business circumstances indicate that the remaining useful life may warrant revision or that the carrying amount of the long-lived asset may not be fully recoverable. The Company performs undiscounted cash flow analysis to determine if impairment exists. If impairment is determined to exist, any related impairment loss is calculated based on fair value. Impairment losses on assets to be disposed of, if any, are based on the estimated proceeds to be received, less costs of disposal. Cash Surrender Value of Life Insurance Policies Increases in the cash surrender value (“CSV”) of life insurance policies, as well as benefits received net of any CSV, are recorded in other noninterest income, and are generally not subject to income taxes. The CSV of the policies is recorded as an asset of the Bank, with liabilities recognized for any split dollar arrangements associated with the policies. The Company reviews the financial strength of the insurance carriers prior to the purchase of life insurance policies and no less than annually thereafter. Regulatory requirements limit the total amount of CSV to be held with any individual carrier to 15% of Tier 1 capital (as defined for regulatory purposes) and the total CSV of all life insurance policies is limited to 25% of Tier 1 capital. Other Real Estate Owned and Other Foreclosed Assets Real estate properties and other assets, which have served as collateral to secure loans, are held for sale and are initially recorded at fair value less estimated costs to sell at the date control is established, resulting in a new cost basis. The amount by which the recorded investment in the loan exceeds the fair value (net of estimated costs to sell) of the foreclosed asset is charged to the allowance for loan losses. Subsequent declines in the fair value of the foreclosed asset below the new cost basis are recorded through the use of a valuation allowance. Subsequent increases in the fair value are recorded as reductions in the valuation allowance, but not below zero. Upon a sale of a foreclosed asset, any excess of the carrying value over the sale proceeds is recognized as a loss on sale. Any excess of sale proceeds over the carrying value of the foreclosed asset is first applied as a recovery to the valuation allowance, if any, with the remainder being recognized as a gain on sale. Operating expenses and changes in the valuation allowance relating to foreclosed assets are included in other noninterest expense. Customer Repurchase Agreements In a security repurchase agreement transaction, the Company will generally sell a security, agreeing to repurchase either the same or substantially identical security on a specified later date, at a greater price than the original sales price. The difference between the sale price and purchase price is the cost of the proceeds, which is recorded as interest expense. The securities underlying the agreements are delivered to counterparties as security for the repurchase obligations. Since the securities are treated as collateral and the agreement does not qualify for a full transfer of effective control, the transactions do not meet the criteria to be classified as a sale, and are therefore considered a secured borrowing transaction for accounting purposes. Derivatives Derivative instruments are carried at fair value in the Company’s financial statements. The accounting for changes in the fair value of a derivative instrument is determined by whether it has been designated and qualifies as part of a hedging relationship, and further, by the type of hedging relationship. At the inception of a hedge, the Company documents certain items, including but not limited to the following: the relationship between hedging instruments and hedged items, the Company's risk management objectives, hedging strategies, and the evaluation of hedge transaction effectiveness. Documentation includes linking all derivatives designated as fair value or cash flow hedges to specific assets and liabilities on the balance sheet or to specific forecasted transactions. For those derivative instruments that are designated and qualify for special hedge accounting, the Company designates the hedging instrument, based upon the exposure being hedged, as either a fair value hedge or a cash flow hedge. For derivative instruments that are designated and qualify as a cash flow hedge (i.e., hedging the exposure to variability in expected future cash flows that is attributable to a particular risk), the effective portion of the gain or loss on the derivative instrument is reported as a component of other comprehensive income, net of related tax. The Company considers any economic mismatch between the hedging instrument and the hedged transaction in its ongoing assessment of hedge effectiveness. If the hedging instrument is not highly effective at achieving offsetting cash flows attributable to the revised contractually specified interest rate(s), hedge accounting will be discontinued. At that time, accumulated other comprehensive income would be frozen and amortized, as long as the forecasted transactions are still probable of occurring. For derivative instruments designated and qualifying as

ACQUISITIONS

ACQUISITIONS	12 Months Ended
	Dec. 31, 2018
Business Acquisition [Line Items]
ACQUISITIONS	ACQUISITIONS Blue Hills Bancorp, Inc. On September 20, 2018, the Company, and Blue Hills Bancorp, Inc. (“Blue Hills Bancorp”), parent of Blue Hills Bank, signed a definitive merger agreement for the Company to acquire Blue Hills Bancorp and the Bank to acquire Blue Hills Bank. The merger agreement provides that each Blue Hills Bancorp stockholder will receive 0.2308 of a share of the Company's common stock and $5.25 in cash for each share of Blue Hills Bancorp common stock. The transaction is intended to qualify as a tax-free reorganization for federal income tax purposes and to provide a tax-free exchange for Blue Hills Bancorp stockholders for the Company common stock portion of the consideration they receive. The merger remains subject to regulatory approval and other customary closing conditions. MNB Bancorp On November 16, 2018, the Company completed its acquisition of MNB Bancorp (MNB Bancorp), the parent company of The Milford National Bank and Trust Company. The transaction qualified as a tax-free reorganization for federal income tax purposes and MNB Bancorp shareholders received, for each share of MNB Bancorp common stock, the right to receive either $275 in cash per share or 3.55 shares of the Company's stock (valued at $285.38 per share, based upon the highest trading value of the Company's stock on November 16, 2018 of $80.39 ). The total deal consideration was $56.1 million and was comprised of 25% cash and 75% stock consideration, which equates to 528,353 shares of the Company's common stock issued to MNB Bancorp shareholders valued at $42.5 million , and $13.6 million in cash, inclusive of cash in lieu of fractional shares. In addition to increasing its loan, deposit and wealth management bases, the Company will be able to provide a deeper product set to new customers, as well as benefit from increased operating synergies, improving the long-term operating and financial results of the Company. The Company accounted for the MNB Bancorp acquisition using the acquisition method pursuant to the Business Combinations Topic of the FASB ASC. Accordingly, the Company recorded merger and acquisition expenses of $8.8 million for the year ended December 31, 2018 related to the MNB Bancorp acquisition. Additionally, the acquisition method requires the acquirer to recognize the assets acquired and the liabilities assumed at their fair values as of the acquisition date. The following table summarizes the estimated fair value of the assets acquired and liabilities assumed as of the date of the acquisition: Net Assets Acquired at Fair Value (Dollars in thousands) Assets Cash $ 6,743 Investments 25,358 Loans 293,498 Premises and equipment 1,904 Goodwill 24,299 Core deposit and other intangibles 8,588 Other assets 8,639 Total assets acquired 369,029 Liabilities Deposits 278,204 Borrowings 33,093 Other liabilities 1,609 Total liabilities assumed 312,906 Purchase price $ 56,123 Fair value adjustments to assets acquired and liabilities assumed are generally amortized using either an effective yield or straight-line basis over periods consistent with the average life, useful life and/or contractual term of the related assets and liabilities. Fair values of the major categories of assets acquired and liabilities assumed were determined as follows: Cash and Cash Equivalents The fair values of cash and cash equivalents approximate the respective carrying amounts because the instruments are payable on demand or have short-term maturities. Loans The loans acquired were recorded at fair value without a carryover of the allowance for loan losses. Fair value of the loans is determined using market participant assumptions in estimating the amount and timing of both principal and interest cash flows expected to be collected, as adjusted for an estimate of future credit losses and prepayments, and then applying a market-based discount rate to those cash flows. The overall discount on the loans acquired in this transaction was due to anticipated credit loss, as well as considerations for liquidity and market interest rates. In addition, the acquired loans were reviewed to determine if any loans would be deemed purchased credit impaired, as determined by identifying evidence of deterioration of credit quality at the purchase date combined with an assumption that all contractually required payments will not be collected. No loans were deemed to be purchased credit impaired. Premises and Equipment The fair value of the premises, including land, buildings and improvements, was determined based upon appraisals by licensed real estate appraisers. The appraisals were based upon the best and highest use of the property with final values determined based upon an analysis of the cost, sales comparison and income capitalization approaches for each property appraised. Core Deposit Intangible The fair value of the core deposit intangible is derived by comparing the interest rate and servicing costs that the financial institution pays on the core deposit liability versus the current market rate for alternative sources of financing, while factoring in estimates over the remaining life and attrition rate of the deposit accounts. The intangible asset represents the stable and relatively low cost source of funds that the deposits and accompanying relationships provide the Company, when compared to alternative funding sources. Customer List Intangible The fair value of the customer list intangible is based on the present value of the incremental after-tax cash flows attributable to the trust relationship. Deposits The fair value of acquired savings and transaction deposit accounts was assumed to approximate the carrying value as these accounts have no stated maturity and are payable on demand. The fair value of time deposits was determined based on the present value of the contractual cash flows over the remaining period to maturity using a market interest rate. Borrowings The fair values of borrowings were derived based upon the present value of the principal and interest payments using a current market discount rate. Selected Pro Forma Results The following summarizes the unaudited pro forma results of operations as if the Company acquired MNB Bancorp on January 1, 2018 (2017 amounts represent combined results for the Company and Island Bancorp). The selected pro forma financial information is presented for illustrative purposes only and is not necessarily indicative of the financial results of the combined companies had the acquisition actually been completed at the beginning of the periods presented, nor does it indicate future results for any other interim or full-year period. Years Ended December 31 2018 2017 Net interest income after provision for loan losses $ 304,049 $ 267,104 Net income 129,797 88,518 Excluded from the pro forma results of operations for the year ended December 31, 2018 are merger-related costs of $7.5 million , net of tax, recognized by both the Company and MNB Bancorp in the aggregate. These costs were primarily made up of contract terminations arising due to the change in control, the acceleration of certain compensation and benefit costs, and other merger expenses. Island Bancorp, Inc. On May 12, 2017, the Company completed its acquisition of Island Bancorp, Inc., the parent of The Edgartown National Bank ("Island Bancorp"). The transaction qualified as a tax-free reorganization for federal income tax purposes and Island Bancorp shareholders received, for each share of Island Bancorp common stock, the right to receive either $500 in cash per share or 9.525 shares of the Company's stock (valued at $605.31 per share, based upon the highest trading value of the Company's stock on May 12, 2017 of $63.55 ). The total deal consideration was $28.3 million and was comprised of 20% cash and 80% stock consideration. The cash consideration was $4.8 million in the aggregate, inclusive of cash paid in lieu of fractional shares. The total stock consideration was $23.5 million resulting in an increase to the Company's outstanding shares of 369,286 shares. In addition to increasing its loan and deposit base, the Company will be able to provide a deeper product set to new customers, as well as benefit from increased operating synergies, improving the long-term operating and financial results of the Company. The Company accounted for the Island Bancorp acquisition using the acquisition method pursuant to the Business Combinations Topic of the FASB ASC. Accordingly, the Company recorded merger and acquisition expenses of $3.2 million for the year ended December 31, 2017 related to the Island Bancorp acquisition. Additionally, the acquisition method requires the acquirer to recognize the assets acquired and the liabilities assumed at their fair values as of the acquisition date. The following table summarizes the estimated fair value of the assets acquired and liabilities assumed as of the date of the acquisition: Net Assets Acquired at Fair Value (Dollars in thousands) Assets Cash $ 11,137 Loans 155,551 Premises and equipment 5,828 Goodwill 10,280 Core deposit and other intangibles 2,964 Other assets 4,629 Total assets acquired 190,389 Liabilities Deposits 159,580 Borrowings 2,475 Other liabilities 18 Total liabilities assumed 162,073 Purchase price $ 28,316 Fair value adjustments to assets acquired and liabilities assumed are generally amortized using either an effective yield or straight-line basis over periods consistent with the average life, useful life and/or contractual term of the related assets and liabilities. Fair values of the major categories of assets acquired and liabilities assumed were determined as follows: Cash and Cash Equivalents The fair values of cash and cash equivalents approximate the respective carrying amounts because the instruments are payable on demand or have short-term maturities. Loans The loans acquired were recorded at fair value without a carryover of the allowance for loan losses. Fair value of the loans is determined using market participant assumptions in estimating the amount and timing of both principal and interest cash flows expected to be collected, as adjusted for an estimate of future credit losses and prepayments, and then applying a market-based discount rate to those cash flows. The overall discount on the loans acquired in this transaction was due to anticipated credit loss, as well as considerations for liquidity and market interest rates. In addition, the acquired loans were reviewed to determine if the loan had evidence of deterioration of credit quality at the purchase date and also reviewed to determine if it was probable that all contractually required payments will not be collected. Based on the review of the loan portfolio at the time of the acquisition, it was deemed that there was no evidence to show that any of the acquired loans were purchased credit impaired. Premises and Equipment The fair value of the premises, including land, buildings and improvements, was determined based upon appraisals by licensed real estate appraisers. The appraisals were based upon the best and highest use of the property with final values determined based upon an analysis of the cost, sales comparison and income capitalization approaches for each property appraised. Core Deposit Intangible The fair value of the core deposit intangible is derived by comparing the interest rate and servicing costs that the financial institution pays on the core deposit liability versus the current market rate for alternative sources of financing, while factoring in estimates over the remaining life and attrition rate of the deposit accounts. The intangible asset represents the stable and relatively low cost source of funds that the deposits and accompanying relationships provide the Company, when compared to alternative funding sources. Deposits The fair value of acquired savings and transaction deposit accounts was assumed to approximate the carrying value as these accounts have no stated maturity and are payable on demand. The fair value of time deposits were determined based on the present value of the contractual cash flows over the remaining period to maturity using a market interest rate. Borrowings The fair values of Federal Home Loan Bank ("FHLB") advances were derived based upon the present value of the principal and interest payments using a current market discount rate. Selected Pro Forma Results The following summarizes the unaudited pro forma results of operations as if the Company acquired Island Bancorp on January 1, 2017 (2016 amounts represent combined results for the Company and Island Bancorp). The selected pro forma financial information is presented for illustrative purposes only and is not necessarily indicative of the financial results of the combined companies had the acquisition actually been completed at the beginning of the periods presented, nor does it indicate future results for any other interim or full-year period. Years Ended December 31 2017 2016 Net interest income after provision for loan losses $ 258,017 $ 227,429 Net income 90,025 78,150 Excluded from the pro forma results of operations for the year ended December 31, 2017 are merger-related costs of $2.6 million

SECURITIES

SECURITIES	12 Months Ended
	Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]
SECURITIES	Trading Securities The Company had trading securities of $1.5 million and $1.3 million as of December 31, 2018 and 2017 , respectively. These securities are held in a rabbi trust and will be used for future payments associated with the Company's non-qualified 401(k) Restoration Plan and Non-qualified Deferred Compensation Plan. Equity Securities The Company had equity securities of $19.5 million as of December 31, 2018 . These securities consist primarily of mutual funds held in a rabbi trust and will be used for future payments associated with the Company’s supplemental executive retirement plans. These securities were previously classified as available for sale and were reclassified as equity securities due to a change in accounting guidance effective January 1, 2018. The equity securities had a fair value of $20.6 million as of December 31, 2017 and are reflected accordingly as available for sale in the table below. The following table represents a summary of the gains and losses that relates to equity securities for the periods indicated: Years Ended December 31 2018 2017 2016 Net losses recognized during the period on equity securities $ (1,225 ) n/a n/a Less: net gains recognized during the period on equity securities sold during the period 874 n/a n/a Unrealized losses recognized during the reporting period on equity securities still held at the reporting date $ (2,099 ) n/a n/a Available for Sale and Held to Maturity Securities The following table presents a summary of the amortized cost, gross unrealized holding gains and losses and fair value of securities available for sale and securities held to maturity for the periods indicated: December 31, 2018 December 31, 2017 Amortized Gross Gross Unrealized Fair Amortized Gross Gross Unrealized Fair (Dollars in thousands) Available for sale securities U.S. government agency securities $ 32,477 $ — $ (439 ) $ 32,038 $ 35,475 $ 86 $ (131 ) $ 35,430 Agency mortgage-backed securities 222,491 1,020 (3,406 ) 220,105 214,934 1,897 (1,067 ) 215,764 Agency collateralized mortgage obligations 138,149 197 (3,435 ) 134,911 124,098 78 (2,164 ) 122,012 State, county, and municipal securities 1,719 16 — 1,735 2,237 37 — 2,274 Single issuer trust preferred securities issued by banks 717 — (10 ) 707 2,012 4 — 2,016 Pooled trust preferred securities issued by banks and insurers 1,678 — (349 ) 1,329 2,179 — (539 ) 1,640 Small business administration pooled securities 53,317 — (1,390 ) 51,927 47,852 44 (118 ) 47,778 Equity securities — — — — 19,432 1,594 (442 ) 20,584 Total available for sale securities 450,548 1,233 (9,029 ) 442,752 448,219 3,740 (4,461 ) 447,498 Held to maturity securities U.S. treasury securities 1,004 11 — 1,015 1,006 29 — 1,035 Agency mortgage-backed securities 252,484 1,548 (3,104 ) 250,928 204,768 1,791 (736 ) 205,823 Agency collateralized mortgage obligations 332,775 869 (6,920 ) 326,724 262,998 397 (4,987 ) 258,408 Single issuer trust preferred securities issued by banks 1,500 — (10 ) 1,490 1,500 29 — 1,529 Small business administration pooled securities 23,727 105 (349 ) 23,483 27,416 183 (200 ) 27,399 Total held to maturity securities 611,490 2,533 (10,383 ) 603,640 497,688 2,429 (5,923 ) 494,194 Total $ 1,062,038 $ 3,766 $ (19,412 ) $ 1,046,392 $ 945,907 $ 6,169 $ (10,384 ) $ 941,692 When securities are sold, the adjusted cost of the specific security sold is used to compute the gain or loss on the sale. The actual maturities of certain securities may differ from the contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. A schedule of the contractual maturities of securities available for sale and securities held to maturity as of December 31, 2018 is presented below: Due in one year or less Due after one year to five years Due after five to ten years Due after ten years Total Amortized Cost Fair Value Amortized Cost Fair Value Amortized Cost Fair Value Amortized Cost Fair Value Amortized Cost Fair Value (Dollars in thousands) Available for sale securities U.S. government agency securities $ — $ — $ 20,010 $ 19,903 $ 12,467 $ 12,135 $ — $ — $ 32,477 $ 32,038 Agency mortgage-backed securities 89 90 52,452 51,761 89,408 88,402 80,542 79,852 222,491 220,105 Agency collateralized mortgage obligations — — — — — — 138,149 134,911 138,149 134,911 State, county, and municipal securities — — 770 771 949 964 — — 1,719 1,735 Single issuer trust preferred securities issued by banks — — — — — — 717 707 717 707 Pooled trust preferred securities issued by banks and insurers — — — — — — 1,678 1,329 1,678 1,329 Small business administration pooled securities — — — — — — 53,317 51,927 53,317 51,927 Total available for sale securities $ 89 $ 90 $ 73,232 $ 72,435 $ 102,824 $ 101,501 $ 274,403 $ 268,726 $ 450,548 $ 442,752 Held to maturity securities U.S. Treasury securities $ — $ — $ 1,004 $ 1,015 $ — $ — $ — $ — $ 1,004 $ 1,015 Agency mortgage-backed securities — — 12,098 11,966 35,703 35,310 204,683 203,652 252,484 250,928 Agency collateralized mortgage obligations — — — — 735 732 332,040 325,992 332,775 326,724 State, county, and municipal securities — — — — — — — — — — Single issuer trust preferred securities issued by banks — — — — 1,500 1,490 — — 1,500 1,490 Small business administration pooled securities — — — — — — 23,727 23,483 23,727 23,483 Total held to maturity securities $ — $ — $ 13,102 $ 12,981 $ 37,938 $ 37,532 $ 560,450 $ 553,127 $ 611,490 $ 603,640 Inclusive in the table above is $5.3 million of callable securities at December 31, 2018 . The carrying value of securities pledged to secure public funds, trust deposits, repurchase agreements and for other purposes, as required or permitted by law, was $361.1 million and $547.2 million at December 31, 2018 and 2017 , respectively. At December 31, 2018 and 2017 , the Company had no investments in obligations of individual states, counties, or municipalities, which exceeded 10% of stockholders’ equity . Other-Than-Temporary Impairment The Company continually reviews investment securities for the existence of OTTI, taking into consideration current market conditions, the extent and nature of changes in fair value, issuer rating changes and trends, the credit worthiness of the obligor of the security, volatility of earnings, current analysts’ evaluations, the Company’s intent to sell the security, whether it is more likely than not that the Company will be required to sell the debt security before its anticipated recovery, as well as other qualitative factors. The term “other-than-temporary” is not intended to indicate that the decline is permanent, but indicates that the prospects for a near-term recovery of value are not necessarily favorable, or that there is a lack of evidence to support a realizable value equal to or greater than the carrying value of the investment. The following tables show the gross unrealized losses and fair value of the Company’s investments in an unrealized loss position, which the Company has not deemed to be OTTI, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position: December 31, 2018 Less than 12 months 12 months or longer Total Description of securities # of Fair Value Unrealized Fair Unrealized Fair Value Unrealized (Dollars in thousands) U.S. government agency securities 3 $ 9,960 $ (43 ) $ 22,078 $ (396 ) $ 32,038 $ (439 ) Agency mortgage-backed securities 144 104,616 (1,363 ) 222,850 (5,147 ) 327,466 (6,510 ) Agency collateralized mortgage obligations 48 57,871 (398 ) 279,229 (9,957 ) 337,100 (10,355 ) Single issuer trust preferred securities issued by banks and insurers 2 2,197 (20 ) — — 2,197 (20 ) Pooled trust preferred securities issued by banks and insurers 1 — — 1,329 (349 ) 1,329 (349 ) Small business administration pooled securities 7 28,257 (662 ) 40,621 (1,077 ) 68,878 (1,739 ) Total temporarily impaired securities 205 $ 202,901 $ (2,486 ) $ 566,107 $ (16,926 ) $ 769,008 $ (19,412 ) December 31, 2017 Less than 12 months 12 months or longer Total Description of securities # of Fair Value Unrealized Fair Unrealized Fair Value Unrealized (Dollars in thousands) U.S.government agency securities 4 $ 24,343 $ (131 ) $ — $ — $ 24,343 $ (131 ) Agency mortgage-backed securities 84 $ 235,411 $ (1,493 ) $ 14,886 $ (310 ) $ 250,297 $ (1,803 ) Agency collateralized mortgage obligations 42 178,142 (1,579 ) 159,506 (5,572 ) 337,648 (7,151 ) Pooled trust preferred securities issued by banks and insurers 1 — — 1,640 (539 ) 1,640 (539 ) Small business administration pooled securities 4 34,553 (223 ) 9,647 (95 ) 44,200 (318 ) Equity securities 28 3,290 (39 ) 7,619 (403 ) 10,909 (442 ) Total temporarily impaired securities 163 $ 475,739 $ (3,465 ) $ 193,298 $ (6,919 ) $ 669,037 $ (10,384 ) The Company does not intend to sell these investments and has determined, based upon available evidence, that it is more likely than not that the Company will not be required to sell each security before the recovery of its amortized cost basis. As a result, the Company does not consider these investments to be OTTI and accordingly, there was no OTTI recorded and no cumulative credit related component of OTTI for the years ended December 31, 2018 , 2017 or 2016 . The Company made this determination by reviewing various qualitative and quantitative factors regarding each investment category, such as current market conditions, extent and nature of changes in fair value, issuer rating changes and trends, volatility of earnings, and current analysts’ evaluations. As a result of the Company’s review of these qualitative and quantitative factors, the causes of the impairments listed in the table above by category are as follows at December 31, 2018 : • U.S. Government Agency Securities, Agency Mortgage-Backed Securities, Agency Collateralized Mortgage Obligations and Small Business Administration Pooled Securities: These portfolios have contractual terms that generally do not permit the issuer to settle the securities at a price less than the current par value of the investment. The decline in market value of these securities is attributable to changes in interest rates and not credit quality. Additionally, these securities are implicitly guaranteed by the U.S. Government or one of its agencies. • Single Issuer Trust Preferred Securities: This portfolio consists of two securities, which are investment grade. The unrealized loss on these securities is attributable to the illiquid nature of the trust preferred market in the current economic environment. Management evaluates various financial metrics for the issuers, including regulatory capital ratios of the issuers. • Pooled Trust Preferred Securities:

LOANS, ALLOWANCE FOR LOAN LOSSE

LOANS, ALLOWANCE FOR LOAN LOSSES AND CREDIT QUALITY	12 Months Ended
	Dec. 31, 2018
Loans, Allowance for Loan Losses and Credit Quality [Abstract]
LOANS, ALLOWANCE FOR LOAN LOSSES AND CREDIT QUALITY	LOANS, ALLOWANCE FOR LOAN LOSSES AND CREDIT QUALITY Allowance for Loan Losses The following table summarizes changes in the allowance for loan losses by loan category and bifurcates the amount of allowance allocated to each loan category based on collective impairment analysis and loans evaluated individually for impairment: December 31, 2018 Commercial Commercial Commercial Small Residential Home Other Consumer Total (Dollars in thousands) Allowance for loan losses Beginning balance $ 13,256 $ 31,453 $ 5,698 $ 1,577 $ 2,822 $ 5,390 $ 447 $ 60,643 Charge-offs (355 ) (82 ) — (372 ) (148 ) (293 ) (1,347 ) (2,597 ) Recoveries 182 188 — 46 12 156 888 1,472 Provision (benefit) 2,677 811 (540 ) 505 533 355 434 4,775 Ending balance $ 15,760 $ 32,370 $ 5,158 $ 1,756 $ 3,219 $ 5,608 $ 422 $ 64,293 Ending balance: collectively evaluated for impairment $ 15,753 $ 32,333 $ 5,158 $ 1,755 $ 2,357 $ 5,444 $ 414 $ 63,214 Ending balance: individually evaluated for impairment $ 7 $ 37 $ — $ 1 $ 862 $ 164 $ 8 $ 1,079 Financing receivables ending balance: Collectively evaluated for impairment $ 1,064,800 $ 3,235,418 $ 365,165 $ 164,135 $ 906,959 $ 1,085,961 $ 15,901 $ 6,838,339 Individually evaluated for impairment 28,829 10,839 — 541 12,706 5,948 197 59,060 Purchased credit impaired loans — 4,991 — — 3,629 175 — 8,795 Total loans by group $ 1,093,629 $ 3,251,248 $ 365,165 $ 164,676 $ 923,294 $ 1,092,084 $ 16,098 $ 6,906,194 (1) December 31, 2017 Commercial Commercial Commercial Small Residential Home Other Consumer Total (Dollars in thousands) Allowance for loan losses Beginning balance $ 16,921 $ 30,369 $ 4,522 $ 1,502 $ 2,621 $ 5,238 $ 393 $ 61,566 Charge-offs (3,891 ) (39 ) — (302 ) (207 ) (276 ) (1,494 ) (6,209 ) Recoveries 615 385 — 114 31 198 993 2,336 Provision (benefit) (389 ) 738 1,176 263 377 230 555 2,950 Ending balance $ 13,256 $ 31,453 $ 5,698 $ 1,577 $ 2,822 $ 5,390 $ 447 $ 60,643 Ending balance: collectively evaluated for impairment $ 13,246 $ 31,411 $ 5,698 $ 1,576 $ 1,815 $ 5,125 $ 430 $ 59,301 Ending balance: individually evaluated for impairment $ 10 $ 42 $ — $ 1 $ 1,007 $ 265 $ 17 $ 1,342 Financing receivables ending balance: Collectively evaluated for impairment $ 853,885 $ 3,093,945 $ 401,797 $ 131,667 $ 733,809 $ 1,045,053 $ 9,573 $ 6,269,729 Individually evaluated for impairment 34,643 16,638 — 703 13,684 6,826 307 72,801 Purchased credit impaired loans — 5,978 — — 6,836 209 — 13,023 Total loans by group $ 888,528 $ 3,116,561 $ 401,797 $ 132,370 $ 754,329 $ 1,052,088 $ 9,880 $ 6,355,553 (1) December 31, 2016 Commercial Commercial Commercial Small Residential Other Consumer Total (Dollars in thousands) Allowance for loan losses Beginning balance $ 13,802 $ 27,327 $ 5,366 $ 1,264 $ 2,590 $ 4,889 $ 587 $ 55,825 Charge-offs (593 ) (414 ) — (228 ) (28 ) (602 ) (1,607 ) (3,472 ) Recoveries 859 564 — 195 299 141 1,080 3,138 Provision (benefit) 2,853 2,892 (844 ) 271 (240 ) 810 333 6,075 Ending balance $ 16,921 $ 30,369 $ 4,522 $ 1,502 $ 2,621 $ 5,238 $ 393 $ 61,566 Ending balance: collectively evaluated for impairment $ 13,260 $ 30,173 $ 4,522 $ 1,494 $ 1,535 $ 4,996 $ 372 $ 56,352 Ending balance: individually evaluated for impairment $ 3,661 $ 196 $ — $ 8 $ 1,086 $ 242 $ 21 $ 5,214 Financing receivables ending balance: Collectively evaluated for impairment $ 862,875 $ 2,983,642 $ 320,391 $ 121,855 $ 622,392 $ 982,095 $ 10,666 $ 5,903,916 Individually evaluated for impairment 39,178 16,813 — 871 14,175 5,863 397 77,297 Purchase credit impaired loans — 10,343 — — 7,859 189 1 18,392 Total loans by group $ 902,053 $ 3,010,798 $ 320,391 $ 122,726 $ 644,426 $ 988,147 $ 11,064 $ 5,999,605 (1) (1) The amount of net deferred costs on originated loans included in the ending balance was $7.1 million , $6.1 million and $5.1 million at December 31, 2018 , 2017 and 2016 , respectively. Net unamortized discounts on acquired loans not deemed to be PCI included in the ending balance were $15.2 million , $9.4 million and $8.6 million at December 31, 2018 , 2017 and 2016 , respectively. For the purpose of estimating the allowance for loan losses, management segregates the loan portfolio into the portfolio segments detailed in the above tables. Each of these loan categories possesses unique risk characteristics that are considered when determining the appropriate level of allowance for each segment. Some of the risk characteristics unique to each loan category include: Commercial Portfolio • Commercial and Industrial : Loans in this category consist of revolving and term loan obligations extended to business and corporate enterprises for the purpose of financing working capital and/or capital investment. Collateral generally consists of pledges of business assets including, but not limited to: accounts receivable, inventory, plant and equipment, or real estate, if applicable. Repayment sources consist of primarily, operating cash flow, and secondarily, liquidation of assets. • Commercial Real Estate : Loans in this category consist of mortgage loans to finance investment in real property such as multi-family residential, commercial/retail, office, industrial, hotels, educational and healthcare facilities and other specific use properties. Loans are typically written with amortizing payment structures. Collateral values are determined based upon third party appraisals and evaluations. Loan to value ratios at origination are governed by established policy and regulatory guidelines. Repayment sources consist of, primarily, cash flow from operating leases and rents and, secondarily, liquidation of assets. • Commercial Construction : Loans in this category consist of short-term construction loans, revolving and nonrevolving credit lines and construction/permanent loans to finance the acquisition, development and construction or rehabilitation of real property. Project types include residential 1-4 family, condominium and multi-family homes, commercial/retail, office, industrial, hotels, educational and healthcare facilities and other specific use properties. Loans may be written with nonamortizing or hybrid payment structures depending upon the type of project. Collateral values are determined based upon third party appraisals and evaluations. Loan to value ratios at origination are governed by established policy and regulatory guidelines. Repayment sources vary depending upon the type of project and may consist of sale or lease of units, operating cash flows or liquidation of other assets. • Small Business: Loans in this category consist of revolving, term loan and mortgage obligations extended to sole proprietors and small businesses for purposes of financing working capital and/or capital investment. Collateral generally consists of pledges of business assets including, but not limited to, accounts receivable, inventory, plant and equipment, or real estate if applicable. Repayment sources consist primarily of operating cash flows and, secondarily, liquidation of assets. For the commercial portfolio it is the Company’s practice to obtain personal guarantees for payment from individuals holding material ownership interests of the borrowing entities. Consumer Portfolio • Residential Real Estate : Residential mortgage loans held in the Company’s portfolio are made to borrowers who demonstrate the ability to make scheduled payments with full consideration to underwriting factors such as current and expected income, employment status, current assets, other financial resources, credit history and the value of the collateral. Collateral consists of mortgage liens on 1-4 family residential properties. Residential mortgage loans also include loans to construct owner-occupied 1-4 family residential properties. • Home Equity : Home equity loans and credit lines are made to qualified individuals and are primarily secured by senior or junior mortgage liens on owner-occupied 1-4 family homes, condominiums or vacation homes. Each home equity loan has a fixed rate and is billed in equal payments comprised of principal and interest. Each home equity line of credit has a variable rate and is billed in interest-only payments during the draw period. At the end of the draw period, the home equity line of credit is billed as a percentage of the then outstanding principal balance plus all accrued interest over a predetermined repayment period, as set forth in the note. Additionally, the Company has the option of renewing each line of credit for additional draw periods. Borrower qualifications include favorable credit history combined with supportive income requirements and combined loan to value ratios within established policy guidelines. • Other Consumer: Other consumer loan products include personal lines of credit, investor management secured lines of credit and amortizing loans made to qualified individuals for various purposes such as debt consolidation, personal expenses or overdraft protection. Borrower qualifications include favorable credit history combined with supportive income and collateral requirements within established policy guidelines. These loans may be secured or unsecured. Credit Quality The Company continually monitors the asset quality of the loan portfolio using all available information. Based on this information, loans demonstrating certain payment issues or other weaknesses may be categorized as adversely risk-rated, delinquent, impaired, nonperforming and/or put on nonaccrual status. Additionally, in the course of resolving such loans, the Company may choose to restructure the contractual terms of certain loans to match the borrower’s ability to repay the loan based on their current financial condition. If a restructured loan meets certain criteria, it may be categorized as a troubled debt restructuring (“TDR”). The Company reviews numerous credit quality indicators when assessing the risk in its loan portfolio. For the commercial portfolio, the Company utilizes a 10-point credit risk-rating system, which assigns a risk-grade to each loan obligation based on a number of quantitative and qualitative factors associated with a commercial or small business loan transaction. Factors considered include industry and market conditions, position within the industry, earnings trends, operating cash flow, asset/liability values, debt capacity, guarantor strength, management and controls, financial reporting, collateral, and other considerations. The risk-ratings categories are defined as follows: • 1- 6 Rating — Pass: Risk-rating grades “1” through “6” comprise those loans ranging from ‘Substantially Risk Free’ which indicates borrowers are of unquestioned credit standing and the pinnacle of credit quality, well established companies with a very strong financial condition, and loans fully secured by cash collateral, through ‘Acceptable Risk’, which indicates borrowers may exhibit declining earnings, strained cash flow, increasing or above average leverage and/or weakening market fundamentals that indicate below average asset quality, margins and market share. Collateral coverage is protective. • 7 Rating — Potential Weakness: Borrowers exhibit potential credit weaknesses or downward trends deserving management’s close attention. If not checked or corrected, these trends will weaken the Company’s asset and position. While potentially weak, currently these borrowers are marginally acceptable; no loss of principal or interest is envisioned. • 8 Rating — Definite Weakness Loss Unlikely: Borrowers exhibit well defined weaknesses that jeopardize the orderly liquidation of debt. Loan may be inadequately protected by the current net worth and paying capacity of the obligor or by the collateral pledged, if any. Normal repayment from the borrower is in jeopardy, although no loss of principal is envisioned. However, there is a distinct possibility that a partial loss of interest and/or principal will occur if the deficiencies are not corrected. Collateral coverage may be inadequate to cover the principal obligation. • 9 Rating — Partial Loss Probable: Borrowers exhibit well defined weaknesses that jeopardize the orderly liquidation of debt with the added provision that the weaknesses make collection of the debt in full, on the basis of currently existing facts, conditions, and values, highly questionable and improbable. Serious problems exist to the point where partial loss of principal is likely. • 10 Rating — Definite Loss: Borrowers deemed incapable of repayment. Loans to such borrowers are considered uncollectible and of such little value that continuation as active assets of the Company is not warranted. The credit quality of the commercial loan portfolio is actively monitored and any changes in credit quality are reflected in risk-rating changes. Risk-ratings are assigned or reviewed for all new loans, when advancing significant additions to existing relationships (over $50,000 ), at least quarterly for all actively managed loans, and any time a significant event occurs, including at renewal of the loan. The Company utilizes a comprehensive strategy for monitoring commercial credit quality. Actively managed commercial borrowers are required to provide updated financial information at least annually which is carefully evaluated for any changes in credit quality. Larger loan relationships are subject to a full annual credit review by an experienced credit analysis group, while continuous portfolio monitoring techniques are employed to evaluate changes in credit quality for smaller loan relationships. Additionally, the Company retains an independent loan review firm to evaluate the credit quality of the commercial loan portfolio. The independent loan review process achieves significant penetration into the commercial loan portfolio and reports the results of these reviews to the Audit Committee of the Board of Directors on a quarterly basis. The following table details the amount of outstanding principal balances relative to each of the risk-rating categories for the Company’s commercial portfolio: December 31, 2018 Category Risk Commercial and Commercial Real Commercial Small Business Total (Dollars in thousands) Pass 1 - 6 $ 1,014,370 $ 3,156,989 $ 361,884 $ 161,851 $ 4,695,094 Potential weakness 7 16,860 56,840 298 888 74,886 Definite weakness - loss unlikely 8 58,909 37,419 2,983 1,937 101,248 Partial loss probable 9 3,490 — — — 3,490 Definite loss 10 — — — — — Total $ 1,093,629 $ 3,251,248 $ 365,165 $ 164,676 $ 4,874,718 December 31, 2017 Category Risk Commercial and Commercial Real Commercial Small Business Total (Dollars in thousands) Pass 1 - 6 $ 806,331 $ 3,007,672 $ 400,964 $ 130,265 $ 4,345,232 Potential weakness 7 16,563 69,788 — 1,471 87,822 Definite weakness - loss unlikely 8 59,415 38,637 833 631 99,516 Partial loss probable 9 6,219 464 — 3 6,686 Definite loss 10 — — — — — Total $ 888,528 $ 3,116,561 $ 401,797 $ 132,370 $ 4,539,256 For the Company’s consumer portfolio, the quality of the loan is best indicated by the repayment performance of an individual borrower. However, the Company does supplement performance data with current Fair Isaac Corporation (“FICO”) scores and Loan to Value (“LTV”) estimates. Current FICO data is purchased and appended to all consumer loans on a regular basis. In addition, automated valuation services and broker opinions of value are used to supplement original value data for the residential and home equity portfolios, periodically. The following table shows the weighted average FICO scores and the weighted average combined LTV ratios as of the periods indicated below: December 31 2018 2017 Residential portfolio FICO score (re-scored)(1) 749 745 LTV (re-valued)(2) 58.6 % 59.2 % Home equity portfolio FICO score (re-scored)(1) 767 766 LTV (re-valued)(2)(3) 49.3 % 50.1 % (1) The average FICO scores at December 31, 2018 are based upon rescores available from November 2018 and origination score data for loans booked in December 2018. The average FICO scores at December 31, 2017 are based upon rescores available from August 2017 and origination score data for loans booked between September and December 2017. (2) The combined LTV ratios for December 31, 2018 are based upon updated automated valuations as of November 2018, when available, and/or the most current valuation data available. The combined LTV ratios for December 31, 2017 are based upon updated automated valuations as of August 2017, when available, and /or the most current valuation data available. The updated automated valuations provide new information on loans that may be available since the previous valuation was obtained. If no new information is available, the valuation will default to the previously obtained data or most recent appraisal. (3) For home equity loans and lines in a subordinate lien, the LTV data represents a combined LTV, taking into account the senior lien data for loans and lines. Asset Quality The Bank’s philosophy toward managing its loan portfolios is predicated upon careful monitoring, which stresses early detection and response to delinquent and default situations. Delinquent loans are managed by a team of seasoned collection specialists and the Company seeks to make arrangements to resolve any delinquent or default situation over the shortest possible time frame. As a general rule, loans more than 90 days past due with respect to principal or interest are classified as nonaccrual loans. The Company also may use discretion regarding the accrual status of other loans over 90 days delinquent if the loan is well secured and in process of collection. The following table shows the carrying value of nonaccrual loans at the dates indicated: December 31 2018 2017 (Dollars in thousands) Commercial and industrial $ 26,310 $ 32,055 Commercial real estate 3,015 3,123 Commercial construction 311 — Small business 235 230 Residential real estate 8,251 8,129 Home equity 7,278 6,022 Other consumer 13 71 Total nonaccrual loans (1) $ 45,413 $ 49,630 (1) Included in these amounts were $29.3 million and $6.1 million of nonaccruing TDRs at December 31, 2018 and 2017 , respectively. During the fourth quarter of 2018 nonaccrual loans associated with a large commercial loan customer that had previously declared bankruptcy were modified when a court confirmed the customer's bankruptcy reorganization plan. That revision to loan terms required the Company to deem loans associated with the customer as troubled debt restructures as of December 31, 2018 which amounted to $25.9 million. The following table shows information regarding foreclosed residential real estate property at the date indicated: December 31, 2018 December 31, 2017 (Dollars in thousands) Foreclosed residential real estate property held by the creditor $ — $ 612 Recorded investment in mortgage loans collateralized by residential real estate property that are in the process of foreclosure $ 3,174 $ 2,971 The following table shows the age analysis of past due financing receivables as of the dates indicated: December 31, 2018 30-59 days 60-89 days 90 days or more Total Past Due Current Total Recorded Number Principal Number Principal Number Principal Number Principal (Dollars in thousands) Commercial and industrial — $ — 4 $ 382 11 $ 26,311 15 $ 26,693 $ 1,066,936 $ 1,093,629 $ — Commercial real estate 9 1,627 — — 8 2,250 17 3,877 3,247,371 3,251,248 — Commercial construction 1 1,271 — — 1 311 2 1,582 363,583 365,165 — Small business 15 506 19 87 24 162 58 755 163,921 164,676 — Residential real estate 23 3,486 6 521 25 4,382 54 8,389 914,905 923,294 — Home equity 22 1,331 12 855 29 2,663 63 4,849 1,087,235 1,092,084 — Other consumer (1) 330 181 15 9 12 13 357 203 15,895 16,098 5 Total 400 $ 8,402 56 $ 1,854 110 $ 36,092 566 $ 46,348 $ 6,859,846 $ 6,906,194 $ 5 December 31, 2017 30-59 days 60-89 days 90 days or more Total Past Due Current Total Recorded Number Principal Number Principal Number Principal Number Principal (Dollars in thousands) Commercial and industrial 2 $ 195 2 $ 370 14 $ 32,007 18 $ 32,572 $ 855,956 $ 888,528 $ — Commercial real estate 7 3,060 — — 9 1,793 16 4,853 3,111,708 3,116,561 — Commercial construction — — — — — — — — 401,797 401,797 — Small business 17 339 11 144 10 57 38 540 131,830 132,370 — Residential real estate 6 870 13 2,385 22 3,471 41 6,726 747,603 754,329 — Home equity 22 1,310 6 451 20 2,025 48 3,786 1,048,302 1,052,088 — Other consumer (1) 265 197 16 27 17 45 298 269 9,611 9,880 8 Total 319 $ 5,971 48 $ 3,377 92 $ 39,398 459 $ 48,746 $ 6,306,807 $ 6,355,553 $ 8 (1) Other consumer portfolio is inclusive of deposit account overdrafts recorded as loan balances. Troubled Debt Restructurings In the course of resolving nonperforming loans, the Bank may choose to restructure the contractual terms of certain loans. The Bank attempts to work out an alternative payment schedule with the borrower in order to avoid foreclosure actions. Any loans that are modified are reviewed by the Bank to identify if a TDR has occurred, which is when, for economic or legal reasons related to a borrower’s financial difficulties, the Bank grants a concession to the borrower that it would not otherwise consider. Terms may be modified to fit the ability of the borrower to repay in line with its current financial status and the restructuring of the loan may include the transfer of assets from the borrower to satisfy the debt, a modification of loan terms, or a combination of the two. The following table shows the Company’s total TDRs and other pertinent information as of the dates indicated: December 31 2018 2017 (Dollars in thousands) TDRs on accrual status $ 23,849 $ 25,852 TDRs on nonaccrual status 29,348 (1) 6,067 Total TDRs $ 53,197 $ 31,919 Amount of specific reserves included in the allowance for loan loss associated with TDRs: $ 1,079 $ 1,342 Additional commitments to lend to a borrower who has been a party to a TDR: $ 982 $ 487 (1) During the fourth quarter of 2018 nonaccrual loans associated with a large commercial loan customer that had previously declared bankruptcy were modified when a court confirmed the customer's bankruptcy reorganization plan. That revision to loan terms required the Company to deem loans associated with the customer as troubled debt restructures as of December 31, 2018 which amounted to $25.9 million. The Company’s policy is to have any restructured loan which is on nonaccrual status prior to being modified remain on nonaccrual status for six months subsequent to being modified before management considers its return to accrual status. If the restructured loan is on accrual status prior to being modified, it is reviewed to determine if the modified loan should remain on accrual status. Additionally, loans classified as TDRs are adjusted to reflect the changes in value of the recorded investment in the loan, if any, resulting from the granting of a concession. For all residential loan modifications, the borrower must perform during a 90 day trial period before the modification is finalized. The following table shows the modifications which occurred during the periods indicated and the change in the recorded investment subsequent to the modifications occurring: Years Ended December 31 2018 Number Pre-Modification Post-Modification (Dollars in thousands) Troubled debt restructurings Commercial and industrial (1) 12 $ 35,688 $ 39,224 Commercial real estate 3 1,600 1,600 Residential real estate 5 1,048 1,071 Home equity 9 562 562 Total 29 $ 38,898 $ 42,457 2017 Troubled debt restructurings Commercial and industrial 12 $ 1,787 $ 1,787 Commercial real estate 6 2,705 2,705 Small business 9 369 369 Residential real estate 10 1,284 1,326 Home equity 17 1,985 1,988 Total 54 $ 8,130 $ 8,175 2016 Troubled debt restructurings Commercial and industrial 10 $ 1,623 $ 1,623 Commercial real estate 10 2,959 2,959 Small business 3 188 188 Residential real estate 8 1,808 1,850 Home equity 13 932 932 Other consumer 6 153 153 Total 50 $ 7,663 $ 7,705 (1) The pre-modification and post-modification balances represent the legal principal balance of the loan. These amounts may show an increase when modifications include a capitalization of interest and/or professional fees. The following table shows the Company’s post-modification balance of TDRs listed by type of modification as of the periods indicated: Years Ended December 31 2018 2017 2016 (Dollars in thousands) Extended maturity $ 2,878 $ 5,881 $ 5,044 Adjusted interest rate 57 — 92 Combination rate and maturity 38,812 568 1,035 Court ordered concession 710 1,726 1,534 Total $ 42,457 $ 8,175 $ 7,705 The Company considers a loan to have defaulted when it reaches 90 days past due. As of December 31, 2018, there were no loans modified during the past twelve months that subsequently defaulted. There was one commercial and industrial loan modified during the proceeding twelve month period that ended December 31, 2017 with a recorded investment of $122,000 , which subsequently defaulted. During the twelve months ended December 31, 2016 there was one commercial real estate loan that was modified during the proceeding twelve month period, with a recorded investment of $249,000 , which subsequently defaulted. All TDR loans are considered impaired and therefore are subject to a specific review for credit losses. The impairment analysis appropriately discounts the present value of the anticipated cash flows by the loan’s contractual rate of interest in effect prior to the loan’s modification. The amount of impairment, if any, is recorded as a specific loss allocation to each individual loan in the allowance for loan losses. Commercial loans (commercial and industrial, commercial construction, commercial real estate and small business loans), residential loans, and home equity loans that have been classified as TDRs and which subsequently default are reviewed to determine if the loan should be deemed collateral dependent. In such an instance, any shortfall between the value of the collateral and the carrying value of the loan is determined by measuring the recorded investment in the loan against the fair value of the collateral less costs to sell. The Company charges off the amount of any confirmed loan loss in the period when the loans, or portion of loans, are deemed uncollectible. Smaller balance consumer TDR loans are reviewed for performance to determine when a charge-off is appropriate. Impaired Loans A loan is considered impaired when, based on current information and events, it is probable that the Company will be unable to collect the scheduled payments of principal or interest when due according to the contractual terms of the loan agreement. Factors considered by management in determining impairment include payment status, collateral value, and the probability of collecting scheduled principal and interest payments when due. Loans that experience insignificant payment delays and payment shortfalls generally are not classified as impaired. Management determines the significance of payment delays and payment shortfalls on a case-by-case basis, taking into consideration all of the circumstances surrounding the loan and the borrower, including the length of the delay, the reasons for the delay, the borrower’s prior payment record, and the amount of the shortfall in relation to the principal and interest owed. The tables below set forth information regarding the Company’s impaired loans. The information for average recorded investment and interest income recognized is reflective of the full period being presented and does not take into account the date at which a loan was deemed to be impaired. See information below as of the dates indicated: As of and For the Years Ended December 31 2018 Recorded Unpaid Related Average Interest Income Recognized (Dollars in thousands) With no related allowance recorded Commercial and industrial $ 28,459 $ 35,913 $ — $ 31,117 $ 142 Commercial real estate 9,552 9,832 — 10,561 519 Small business 358 439 — 401 14 Residential real estate 4,518 4,686 — 4,597 212 Home equity 4,957 5,199 — 5,230 220 Other consumer 56 56 — 64 4 Subtotal 47,900 56,125 — 51,970 1,111 With an allowance recorded Commercial and industrial 370 370 7 385 19 Commercial real estate 1,287 1,287 37 1,311 74 Small business 183 223 1 225 13 Residential real estate 8,188 9,217 862 8,459 289 Home equity 991 1,149 164 1,018 43 Other consumer 141 143 8 154 5 Subtotal 11,160 12,389 1,079 11,552 443 Total $ 59,060 $ 68,514 $ 1,079 $ 63,522 $ 1,554 2017 Recorded Unpaid Related Average Interest (Dollars in thousands) With no related allowance recorded Commercial and industrial $ 34,267 $ 38,329 $ — $ 36,631 $ 446 Commercial real estate 13,245 14,374 — 13,683 559 Small business 556 619 — 569 21 Residential real estate 4,264 4,397 — 4,332 218 Home equity 4,950 5,056 — 5,063 198 Other consumer 91 92 — 102 7 Subtotal 57,373 62,867 — 60,380 1,449 With an allowance recorded Commercial and industrial 376 376 10 391 19 Commercial real estate 3,393 3,399 42 3,447 198 Small business 147 153 1 238 14 Residential real estate 9,420 10,154 1,007 9,575 284 Home equity 1,876 2,110 265 1,916 55 Other consumer 216 217 17 233 7 Subtotal 15,428 16,409 1,342 15,800 577 Total $ 72,801 $ 79,276 $ 1,342 $ 76,180 $ 2,026 2016 Recorded Unpaid Related Average Interest (Dollars in thousands) With no related allowance recorded Commercial and industrial $ 28,776 $ 29,772 $ — $ 26,472 $ 927 Commercial real estate 11,628 12,891 — 12,744 437 Commercial construction — — — — — Small business 494 569 — 534 20 Residential real estate 4,216 4,427 — 4,302 185 Home equity 4,485 4,572 — 4,602 184 Other consumer 146 146 — 160 11 Subtotal 49,745 52,377 — 48,814 1,764 With an allowance recorded Commercial and industrial 10,402 10,440 3,661 10,760 325 Commercial real estate 5,185 5,533 196 5,491 200 Small business 377 392 8 408 21 Residential real estate 9,959 10,530 1,086 10,065 332 Home equity 1,378 1,547 242 1,403 50 Other consumer 251 252 21 268 8 Subtotal 27,552 28,694 5,214 28,395 936 Total $ 77,297 $ 81,071 $ 5,214 $ 77,209 $ 2,700 Purchased Credit Impaired Loans Certain loans acquired by the Company may have shown evidence of deterioration of credit quality since origination and it was deemed unlikely that the Company would be able to collect all contractually required payments. As such, these loans were deemed to be PCI loans and the carrying value and prospective income recognition are predicated upon future cash flows expected to be collected. The following table displays certain information pertaining to PCI loans at the dates indicated: December 31 2018 2017 (Dollars in thousands) Outstanding balance $ 9,749 $ 14,485 Carrying amount $ 8,795 $ 13,023 The following table summarizes activity in the accretable yield for the PCI loan portfolio: 2018 2017 (Dollars in thousands) Beginning balance $ 1,791 $ 2,370 Accretion (1,135 ) (1,475 ) Other change in expected cash flows (1) 310 748 Reclassification from nonaccretable difference for loans which have paid off (2) 225 148 Ending balance $ 1,191 $ 1,791 (1) Represents changes in cash flows expected to be collected resulting in increased interest income as a prospective yield adjustment over the remaining life of the loan(s). (2)

BANK PREMISES AND EQUIPMENT

BANK PREMISES AND EQUIPMENT	12 Months Ended
	Dec. 31, 2018
Property, Plant and Equipment [Abstract]
BANK PREMISES AND EQUIPMENT	Bank premises and equipment at December 31, were as follows: 2018 2017 Estimated (Dollars in thousands) (In years) Cost Land $ 24,502 $ 23,719 n/a Bank premises 53,052 49,159 5-40 Leasehold improvements 27,615 25,184 1-27 Furniture and equipment 66,974 62,521 2-12 Leased equipment 10,644 10,644 7 Total cost 182,787 171,227 Accumulated depreciation (85,206 ) (76,505 ) Net bank premises and equipment $ 97,581 $ 94,722 Depreciation expense related to bank premises and equipment was $9.1 million in 2018 , $8.5 million in 2017 , and $7.3 million in 2016 , which is primarily included in occupancy and equipment expenses. Depreciation expense relating to computer software is included within other noninterest expense. During 2017, the Company purchased equipment that was subject to a master lease agreement with a third party lessee. As such, the Company assumed the role of lessor in conjunction with the purchase, which was deemed to be an operating lease for accounting purposes. The Company purchased a total of $10.6 million of equipment subject to the lease agreement in 2017. In addition, the Company recognized rental income of $1.6 million and $1.3 million for the years ended December 31, 2018 and 2017, respectively, as well as depreciation expense of $1.3 million and $939,000

GOODWILL AND IDENTIFIABLE INTAN

GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS	12 Months Ended
	Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS	GOODWILL AND OTHER INTANGIBLE ASSETS The following table sets forth the carrying value of goodwill and other intangible assets, net of accumulated amortization, at December 31: 2018 2017 (Dollars in thousands) Balances not subject to amortization Goodwill $ 256,105 $ 231,806 Balances subject to amortization Core deposit intangibles 13,692 8,636 Other intangible assets 1,558 705 Total other intangible assets 15,250 9,341 Total goodwill and other intangible assets $ 271,355 $ 241,147 The changes in the carrying value of goodwill for the periods indicated were as follows: 2018 2017 (Dollars in thousands) Balance at beginning of year $ 231,806 $ 221,526 Acquisitions 24,299 10,280 Balance at end of year $ 256,105 $ 231,806 The gross carrying amount and accumulated amortization of other intangible assets were as follows at the dates indicated: December 31 2018 2017 Gross Accumulated Net Gross Accumulated Net (Dollars in thousands) Core deposit intangibles $ 34,137 $ (20,445 ) $ 13,692 $ 26,736 $ (18,100 ) $ 8,636 Other intangible assets 3,103 (1,545 ) 1,558 3,165 (2,460 ) 705 Total $ 37,240 $ (21,990 ) $ 15,250 $ 29,901 $ (20,560 ) $ 9,341 Amortization of intangible assets was $2.7 million , $3.5 million , and $2.8 million at December 31, 2018 , 2017 , and 2016 , respectively. The following table sets forth the estimated annual amortization expense of intangible assets for each of the next five years: Year Amount (Dollars in thousands) 2019 $ 3,050 2020 $ 2,647 2021 $ 2,394 2022 $ 1,962 2023 $ 1,697 The original weighted average amortization period for intangible assets is 10.0 years

DEPOSITS

DEPOSITS	12 Months Ended
	Dec. 31, 2018
Banking and Thrift [Abstract]
DEPOSITS	DEPOSITS The following is a summary of the scheduled maturities of time deposits as of December 31: 2018 2017 (Dollars in thousands) 1 year or less $ 511,292 71.9 % $ 393,452 61.1 % Over 1 year to 2 years 111,487 15.7 % 119,341 18.5 % Over 2 years to 3 years 41,523 5.8 % 57,619 8.9 % Over 3 years to 4 years 27,040 3.8 % 41,183 6.4 % Over 4 years to 5 years 19,761 2.8 % 32,706 5.1 % Total $ 711,103 100.0 % $ 644,301 100.0 % The amount of overdraft deposits that were reclassified to the loan category were $3.3 million and $2.3 million at December 31, 2018 and 2017 , respectively. The Company has pledged assets as collateral covering certain deposits in the amount of $356.8 million and $349.2 million at December 31, 2018 and 2017 , respectively. The Bank's deposit accounts are insured to the maximum extent permitted by law by the Deposit Insurance Fund which is administered by the FDIC. The FDIC offers insurance coverage on deposits up to the federally insured limit of $250,000. The amount of time deposit accounts equal to or greater than $250,000 as of December 31, 2018 and 2017 is $104.9 million and $80.0 million

BORROWINGS

BORROWINGS	12 Months Ended
	Dec. 31, 2018
Debt Disclosure [Abstract]
BORROWINGS	BORROWINGS Federal Home Loan Bank Borrowings Advances payable to the Federal Home Loan Bank as of December 31 are summarized as follows: 2018 2017 Weighted Weighted Average Average Total Contractual Total Contractual Outstanding Rate Outstanding Rate (Dollars in thousands) Stated Maturity 2018 $ — — % $ 52,475 1.58 % 2019 147,046 2.68 % — — % Subtotal 147,046 2.68 % 52,475 1.58 % Amortizing advances 760 789 Total Federal Home Loan Bank Advances $ 147,806 $ 53,264 To manage the interest rate risk of these advances, the Company may enter into interest rate swap agreements which effectively fix the rate of the borrowing. Inclusive of the impact of these swap arrangements, the weighted average rate of the FHLB borrowings was 2.55% and 2.47% at December 31, 2018 and 2017 , respectively. The Company’s FHLB advances are collateralized by a blanket pledge agreement on the Bank’s FHLB stock, certain qualified investment securities, deposits at the FHLB, residential mortgages, and by certain commercial real estate loans held in the Bank’s portfolio. The carrying value of the loans pledged as collateral for these borrowings totaled $1.6 billion and $1.5 billion at December 31, 2018 and 2017 , respectively. The Bank’s unused remaining available borrowing capacity at the FHLB was approximately $953.5 million and $954.8 million at December 31, 2018 and 2017 , respectively, inclusive of a $5.0 million line of credit. At December 31, 2018 and 2017 , the Company had sufficient collateral at the FHLB to support its obligations and was in compliance with the FHLB's collateral pledging program. Short-Term Debt The Company had no short-term borrowings at December 31, 2018 . The Company’s short-term borrowings at December 31, 2017 consisted of customer repurchase agreements of $162.7 million which were discontinued and transitioned to a deposit product offering in the fourth quarter of 2018. The interest expense on short-term borrowings was $248,000 , $257,000 , and $208,000 for the years ended December 31, 2018 , 2017 , and 2016 , respectively. Customer Repurchase Agreements . The Company raised additional liquidity by entering into repurchase agreements at its discretion. These repurchases were accounted for as a secured borrowing transaction for accounting purposes. Payments on such borrowings were interest only until the scheduled repurchase date. In a repurchase agreement the Company was subject to the risk that the purchaser may default at maturity and not return the securities underlying the agreements. In order to minimize this potential risk, the Company entered into repurchase agreements that stipulated that the securities underlying the agreement were not delivered to the customer and instead were held in segregated safekeeping accounts by the Company's safekeeping agents. The table below sets forth the remaining contractual maturity of the Company’s repurchase agreements allocated by source of collateral at the dates indicated: December 31 2018 2017 (Dollars in thousands) Sources of collateral U.S. government agency securities $ — $ 16,867 Agency mortgage-backed securities — 51,273 Agency collateralized mortgage obligations — 94,539 Total customer repurchase agreements (1) $ — $ 162,679 (1) All customer repurchase agreements had an overnight and continuous maturity date. For further information regarding the Company's repurchase agreements see Note 12 , " Balance Sheet Offsetting ." Long-Term Debt The following table summarizes long-term debt, net of debt issuances costs, as of the periods indicated: December 31 2018 2017 (Dollars in thousands) Junior subordinated debentures Capital Trust V $ 51,505 $ 51,503 Slades Ferry Trust I 10,234 10,229 Central Trust I 5,258 5,258 Central Trust II 6,083 6,083 East Main Street Trust 3,093 — Subordinated debentures 34,728 34,682 Total long-term debt $ 110,901 $ 107,755 The interest expense on long-term debt was $4.2 million , $4.0 million , and $5.8 million for the years ended December 31, 2018 , 2017 , and 2016 , respectively. Junior Subordinated Debentures : The junior subordinated debentures are issued to various trust subsidiaries of the Company. These trusts are considered to be variable interest entities for which the Company is not the primary beneficiary, and therefore the accounts of the trusts are not included in the Company’s consolidated financial statements. These trusts were formed for the purpose of issuing trust preferred securities, which were then sold in a private placement offering. The proceeds from the sale of the securities and the issuance of common stock by these trusts were invested in these Junior Subordinated Debentures issued by the Company. For regulatory purposes, bank holding companies are allowed to include trust preferred securities in Tier 1 capital up to a certain limit. Provisions in the Dodd-Frank Act generally exclude trust preferred securities from Tier 1 capital, however, holding companies with consolidated assets of less than $15 billion, such as the Company, are able to continue to include these instruments in Tier 1 capital, but no such securities issued in the future will count as Tier 1 capital. Information relating to these trust preferred securities is as follows: Trust Description of Capital Securities Capital Trust V $50.0 million due in 2037, interest at a variable rate of 3 month LIBOR plus 1.48% (4.27% at December 31, 2018),which, effective on January 17, 2017, has been converted to a fixed rate of 2.84% through the use of an interest rate swap. Slades Ferry Trust I $10.0 million due in 2034, bearing interest at a variable rate of 3 month LIBOR plus 2.79% (5.59% at December 31, 2018). These securities are callable quarterly, until maturity. Central Trust I $5.1 million due in 2034, bearing interest at a variable rate of 3 month LIBOR plus 2.44% (5.23% at December 31, 2018). These securities are callable quarterly, until maturity. Central Trust II $5.9 million due in 2037, bearing interest at a variable rate of 3 month LIBOR plus 1.65% (4.44% at December 31, 2018). These securities are callable quarterly, until maturity. Junior subordinated debentures of $3.1 million assumed in the MNB Bancorp acquisition, relating to East Main Street Trust I, were subsequently paid in full during January 2019. All obligations under these trust preferred securities are unconditionally guaranteed by the Company. Subordinated Debentures : At December 31, 2018 and 2017 there was $35.0 million of outstanding subordinated debentures at the bank holding company. The subordinated debentures were issued to several investors via private placement on November 17, 2014. The subordinated debt matures on November 15, 2024, however with regulatory approval, the Bank may redeem the subordinated debt without penalty at any scheduled payment date on or after November 15, 2019 with 30 days notice. The interest rate is fixed at 4.75% through November 15, 2019, after which it converts to LIBOR plus 2.98% . The following table sets forth the contractual maturities of long-term debt over the next five years: 2019 2020 2021 2022 2023 Thereafter Total (Dollars in thousands) Junior subordinated debentures Capital trust V $ — $ — $ — $ — $ — $ 51,547 $ 51,547 Slades ferry trust I — — — — — 10,310 10,310 Central trust I — — — — — 5,258 5,258 Central trust II — — — — — 6,083 6,083 East Main Street Trust — — — — — 3,093 3,093 Subordinated debentures — — — — — 35,000 35,000 Total $ — $ — $ — $ — $ — $ 111,291 $ 111,291

EARNINGS PER SHARE

EARNINGS PER SHARE	12 Months Ended
	Dec. 31, 2018
Earnings Per Share [Abstract]
EARNINGS PER SHARE	Earnings per share consisted of the following components for the years ended December 31: 2018 2017 2016 (Dollars in thousands, except per share data) Net income $ 121,622 $ 87,204 $ 76,648 Weighted Average Shares Basic shares 27,592,380 27,294,028 26,404,071 Effect of dilutive securities 61,428 78,076 51,847 Diluted shares 27,653,808 27,372,104 26,455,918 Net income per share Basic EPS $ 4.41 $ 3.19 $ 2.90 Effect of dilutive securities (0.01 ) — — Diluted EPS $ 4.40 $ 3.19 $ 2.90 For the years ended December 31, 2018 and 2016 and there were no options to purchase common stock and no shares of performance-based restricted stock that were excluded from the calculation of diluted earnings per share because they were anti-dilutive. For the year ended December 31, 2017 there were 103 options to purchase common stock and no

STOCK BASED COMPENSATION

STOCK BASED COMPENSATION	12 Months Ended
	Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
STOCK BASED COMPENSATION	The Company's stock based plans include the Second Amended and Restated 2005 Employee Stock Plan (“2005 Plan”), the 2010 Non-Employee Director Stock Plan ("the 2010 Plan") and the 2018 Non-Employee Director Stock Plan (“2018 Plan”), all of which have been approved by the Company’s Board of Directors and shareholders. Due to the expiration of the 2010 plan on May 17, 2018, the Company may only award shares from the 2005 Plan or the 2018 Plan. These shares may be awarded as either stock option awards or restricted stock awards from its pool of authorized but unissued shares. The following table presents the amount of cumulatively granted stock option awards and restricted stock awards, net of forfeitures and expirations, through December 31, 2018 : Authorized Awards Cumulatively Granted, Net of Total Authorized Stock Restricted 2005 Plan 1,650,000 387,258 750,931 1,138,189 511,811 2010 Plan 314,600 46,500 93,245 139,745 174,855 (1) 2018 Plan 300,000 — 6,000 6,000 294,000 (1) (1) The Company may award up to a total of 300,000 shares from the 2018 Plan, inclusive of 174,855 shares that were Authorized but Unissued in the 2010 Plan, and were transferred from the 2010 Plan to the 2018 Plan. Due to this transfer, there are no available shares remaining to be issued from the 2010 Plan. The following table presents the pre-tax expense associated with stock option and restricted stock awards and the related tax benefits recognized for the periods presented: Years Ended December 31 2018 2017 2016 (Dollars in thousands) Stock based compensation expense Restricted stock awards(1) $ 3,299 $ 2,730 $ 2,590 Directors’ fee expense Stock options 66 76 72 Restricted stock awards 860 527 303 Total stock based award expense $ 4,225 $ 3,333 $ 2,965 Related tax benefits recognized in earnings $ 1,188 $ 1,362 $ 1,211 (1) Inclusive of compensation expense associated with time-vested and performance-based restricted stock awards. Expense related to awards issued to directors is recognized as directors’ fees within other noninterest expense. The Company has standard form agreements used for stock option and restricted stock awards. The standard form agreements used for the Chief Executive Officer and all other Executive Officers have previously been disclosed in Securities and Exchange Commission filings and generally provide that: (1) any unvested options or unvested restricted stock vest upon a Change of Control; and, that (2) any stock options which vest pursuant to a Change of Control, which is an event described in Section 280G of the Internal Revenue Code of 1986, will be cashed out at the difference between the acquisition price and the exercise price of the stock option. Stock Options The fair value of each stock option grant is estimated on the date of the grant using the Black-Scholes option-pricing model with the following assumptions used for grants under the identified plans: • Expected volatility is based on the standard deviation of the historical volatility of the weekly adjusted closing price of the Company’s shares for a period equivalent to the expected life of the option. • Expected life represents the period of time that the option is expected to be outstanding, taking into account the contractual term, historical exercise/forfeiture behavior, and the vesting period, if any. • Expected dividend yield is an annualized rate calculated using the most recent dividend payment at time of grant and the Company’s average trailing twelve-month daily closing stock price. • The risk-free rate is based on the U.S. Treasury yield curve in effect at the time of grant for a period equivalent to the expected life of the option. • Prior to January 1, 2017, the stock based compensation expense recognized in earnings was based on the amount of awards ultimately expected to vest, therefore a forfeiture assumption was estimated at the time of grant and revised, if necessary, in subsequent periods if actual forfeitures differed from those estimates. Stock based compensation expense recognized was reduced for annualized estimated forfeitures of 4.5% in 2016 based on historical experience. Effective January 1, 2017, the Company adopted new accounting guidance and elected to no longer estimate forfeitures on stock compensation and instead recognize forfeitures when they occur. The election required a cumulative effect adjustment to retained earnings which did not materially impact the Company's consolidated financial position. The following table presents the awards granted by the Company of nonqualified options to purchase shares of common stock for the periods presented: Years Ended December 31 2018 2017 2016 Date of grant 4/3/2018 11/7/2017 7/14/2016 2/20/2016 Plan 2010 2010 2010 2010 Options granted 5,000 5,000 5,000 5,000 Vesting period (beginning on the grant date) 21 months 14 months 18 months 22 months Expiration date 4/3/2028 11/7/2027 7/14/2026 2/20/2026 Expected volatility 21.15 % 20.80 % 32.28 % 32.44 % Expected life (years) 5.5 5.5 5.5 5.5 Expected dividend yield 1.94 % 1.87 % 2.37 % 2.28 % Risk free interest rate 2.62 % 2.02 % 1.14 % 1.29 % Fair value per option $ 13.46 $ 12.43 $ 11.46 $ 10.59 Under all of the Company’s stock based plans, the option exercise price is based upon the average of the high and low trading value of the stock on the date of grant. Stock option awards granted to date under all plans expire at various dates through 2028 . The following table presents relevant information relating to the Company’s stock options for the periods presented: Years Ended December 31 2018 2017 2016 (Dollars in thousands, except per share data) Fair value of stock options vested based on grant date fair value $ 85 $ 72 $ 37 Intrinsic value of stock options exercised $ 1,525 $ 1,082 $ 494 Cash received from stock option exercises $ 1,024 $ 918 $ 680 Tax benefit realized on stock option exercises $ 429 $ 442 $ 204 Weighted average grant date fair value of options granted (per share) $ 13.46 $ 12.43 $ 11.03 The following table presents a summary of stock option award activity for the year ended December 31, 2018 . Outstanding Nonvested Stock Option Weighted Weighted Aggregate Stock Weighted (Dollars in thousands, except per share data) Balance at January 1, 2018 84,000 $ 32.16 4,999 $ 12.11 Granted 5,000 70.85 5,000 13.46 Exercised (34,500 ) 29.67 n/a n/a Vested n/a n/a (6,667 ) 12.70 Forfeited — — — — Expired — — — — Balance at December 31, 2018 54,500 (2) $ 37.28 4.02 years $ 1,776 3,332 $ 12.94 Options outstanding and expected to vest at December 31, 2018 54,500 (3) $ 37.28 4.02 years $ 1,776 Options exercisable at December 31, 2018 51,168 (4) $ 35.12 3.69 years $ 1,776 Unrecognized compensation cost $ 23 Weighted average remaining recognition period (years) 1.00 (1) The aggregate intrinsic value represents the total pre-tax intrinsic value, based on the average of the high price and low price at which the Company’s common stock traded on December 31, 2018 of $69.72 , which would have been received by in-the-money option holders had they all exercised their options as of that date. (2) Inclusive of 32,500 stock options outstanding to Directors. (3) Inclusive of 32,500 vested stock options and expected to vest to Directors. (4) Inclusive of 29,168 vested stock options outstanding to Directors. Restricted Stock The Company grants both time-vested restricted stock awards as well as performance-based restricted stock awards. During the years ended December 31, 2018 , 2017 , and 2016 the Company has made the following restricted stock award grants: Shares Granted Plan Fair Value (1) Vesting Period Time-vested 2018 2/15/2018 39,950 2005 $ 71.75 Ratably over 5 years from grant date 2/27/2018 1,150 2005 $ 72.60 Ratably over 5 years from grant date 5/15/2018 530 2005 $ 74.00 Ratably over 5 years from grant date 5/22/2018 6,000 2018 $ 76.58 Immediately upon grant date 11/15/2018 560 2005 $ 77.78 Ratably over 5 years from grant date 2017 2/13/2017 1,200 2005 $ 62.53 Ratably over 5 years from grant date 2/16/2017 34,150 2005 $ 63.10 Ratably over 5 years from grant date 3/31/2017 500 2005 $ 65.63 Ratably over 5 years from grant date 4/3/2017 1,500 2005 $ 64.14 Once on November 30, 2017 (2) 5/15/2017 1,000 2005 $ 64.03 Ratably over 5 years from grant date 5/23/2017 7,000 2010 $ 61.95 At the end of 5 years from grant date (3) 6/15/2017 950 2005 $ 66.18 Ratably over 5 years from grant date 2016 2/11/2016 51,475 2005 $ 41.96 Ratably over 5 years from grant date 3/1/2016 600 2005 $ 44.37 Ratably over 5 years from grant date 5/24/2016 8,700 2010 $ 48.34 Once on May 24, 2021 (3) 9/19/2016 800 2005 $ 52.92 Ratably over 5 years from grant date 11/7/2016 500 2005 $ 54.28 Ratably over 5 years from grant date 11/14/2016 725 2010 $ 63.43 Once on May 24, 2021 (3) Performance-based 2/15/2018 16,300 2005 $ 71.75 The earlier of: the date on which it is determined if the performance goal has been achieved; or, March 31, 2021. 2/16/2017 14,400 2005 $ 63.10 The earlier of: the date on which it is determined if the performance goal has been achieved; or, March 31, 2020. 2/11/2016 20,450 2005 $ 41.96 The earlier of: the date on which it is determined if the performance goal has been achieved; or, March 31, 2019. (1) The fair value of the restricted stock awards are based upon the average of the high and low prices at which the Company’s common stock traded on the date of grant. The holders of time-vested restricted stock awards participate fully in the rewards of stock ownership of the Company, including voting and dividend rights. The holders of performance-based restricted stock awards do not participate in the rewards of stock ownership of the Company until vested. The holders of all restricted stock awards are not required to pay any consideration to the Company for the awards. (2) This restricted stock grant fully vested upon an employee's termination, on November 30, 2017. (3) These restricted stock grants will vest on May 24, 2021, or earlier if the director ceases to be a director for any reason other than cause, such as, for example, by retirement. The following table presents the fair value of restricted stock awards vesting for the periods presented: Years Ended December 31 2018 2017 2016 (Dollars in thousands) Fair value of restricted stock awards upon vesting $ 6,277 $ 5,717 $ 3,019 The following table presents a summary of restricted stock award activity for the year ended December 31, 2018 : Outstanding Restricted Stock Weighted Average (Dollars in thousands, except per share data) Balance at January 1, 2018 225,965 $ 46.18 Granted 64,490 72.28 Vested/released (86,219 ) 43.39 Forfeited (2,130 ) 53.78 Balance at December 31, 2018 202,106 (1) $ 55.62 Unrecognized compensation cost (inclusive of directors’ fees) $ 6,911 Weighted average remaining recognition period (years) 2.96 (1) Inclusive of 23,385

DERIVATIVES AND HEDGING ACTIVIT

DERIVATIVES AND HEDGING ACTIVITIES	12 Months Ended
	Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
DERIVATIVES AND HEDGING ACTIVITIES	DERIVATIVES AND HEDGING ACTIVITIES The Company early adopted ASU 2017-12, Derivatives and Hedging: Targeted Improvements to Accounting for Hedging Activities as of January 1, 2018 to incorporate the new standard’s alignment of hedge accounting qualifications with the Company’s interest rate risk management with respect to new hedges entered into during 2018. This new standard was adopted under a modified retrospective transition, resulting in no changes to the accounting for hedge positions entered in to prior to January 1, 2018. The Company’s derivative financial instruments are used to manage differences in the amount, timing, and duration of the Company’s known or expected cash receipts and its known or expected cash payments principally to manage the Company’s interest rate risk. Additionally, the Company enters into interest rate derivatives and foreign exchange contracts to accommodate the business requirements of its customers (“customer related positions”). The Company minimizes the market and liquidity risks of customer related positions by entering into similar offsetting positions with broker-dealers. Derivative instruments are carried at fair value in the Company’s financial statements. The accounting for changes in the fair value of a derivative instrument is dependent upon whether or not it qualifies as a hedge for accounting purposes, and further, by the type of hedging relationship. The Company does not enter into proprietary trading positions for any derivatives. Interest Rate Positions The Company may utilize interest rate derivatives as hedging instruments against interest rate risk associated with the Company’s borrowings and loan portfolios. An interest derivative is an agreement whereby one party agrees to pay a floating rate of interest on a notional principal amount in exchange for receiving a fixed rate of interest on the same notional amount, for a predetermined period of time, from a second party. The amounts relating to the notional principal amount are not actually exchanged. The following table reflects information about the Company’s derivative positions for the periods indicated below for interest rate swaps which qualify as cash flow hedges for accounting purposes: December 31, 2018 Weighted Average Rate Notional Amount Weighted Average Maturity Current Pay Fixed Fair Value (in thousands) (in years) (in thousands) Interest rate swaps on borrowings $ 75,000 3.18 2.74 % 1.53 % $ 2,282 Current Rate Paid Receive Fixed Swap Rate Interest rate swaps on loans 250,000 4.52 2.57 % 2.67 % 2,938 Current Rate Paid Receive Fixed Swap Rate Cap - Floor Interest rate collars on loans 250,000 4.17 2.47 % 3.02% - 2.51% 3,344 Total $ 575,000 $ 8,564 December 31, 2017 Weighted Average Rate Notional Amount Weighted Average Maturity Current Pay Fixed Fair Value (in thousands) (in years) (in thousands) Interest rate swaps on borrowings $ 100,000 3.37 1.54 % 1.89 % $ 1,616 Total $ 100,000 $ 1,616 The maximum length of time over which the Company is currently hedging its exposure to the variability in future cash flows for forecasted transactions related to the payment of variable interest on existing financial instruments is 5.1 years. For derivative instruments that are designated and qualify as cash flow hedging instruments, the effective portion of the gains or losses is reported as a component of other comprehensive income ("OCI"), and is subsequently reclassified into earnings in the period that the hedged forecasted transaction affects earnings. The Company expects approximately $654,000 (pre-tax) to be reclassified to interest income and $872,000 (pre-tax) to be reclassified as an offset to interest expense, from OCI related to the Company’s cash flow hedges in the next twelve months. This reclassification is due to anticipated payments that will be made and/or received on the swaps based upon the forward curve as of December 31, 2018 . The Company recognized net amortization income that was an offset to interest expense related to previously terminated swaps of $231,000 for the year ended December 31, 2018 and $244,000 for the years ended December 31, 2017 and 2016 . The Company had no fair value hedges during 2018 , 2017 and 2016 . Customer Related Positions Loan level derivatives, primarily interest rate swaps, offered to commercial borrowers through the Company’s loan level derivative program do not qualify as hedges for accounting purposes. The Company believes that its exposure to commercial customer derivatives is limited because these contracts are simultaneously matched at inception with an offsetting dealer transaction. The commercial customer derivative program allows the Company to retain variable-rate commercial loans while allowing the customer to synthetically fix the loan rate by entering into a variable-to-fixed interest rate swap. The amounts relating to the notional principal amount are not actually exchanged. Foreign exchange contracts offered to commercial borrowers through the Company’s derivative program do not qualify as hedges for accounting purposes. The Company acts as a seller and buyer of foreign exchange contracts to accommodate its customers. To mitigate the market and liquidity risk associated with these derivatives, the Company enters into similar offsetting positions. The amounts relating to the notional principal amount are exchanged. The following table reflects the Company’s customer related derivative positions for the periods indicated below for those derivatives not designated as hedging: Number of Notional Amount Maturing Less than 1 year Less than 2 years Less than 3 years Less than 4 years Thereafter Total Fair Value December 31, 2018 (Dollars in thousands) Loan level swaps Receive fixed, pay variable 235 $ 50,702 $ 124,222 $ 97,904 $ 47,308 $ 631,471 $ 951,607 $ (2,907 ) Pay fixed, receive variable 220 $ 50,702 $ 124,222 $ 97,904 $ 47,308 $ 631,471 $ 951,607 $ 2,903 Foreign exchange contracts Buys foreign currency, sells U.S. currency 27 $ 60,297 $ 3,505 $ — $ — $ — $ 63,802 $ (1,404 ) Buys U.S. currency, sells foreign currency 27 $ 60,297 $ 3,505 $ — $ — $ — $ 63,802 $ 1,434 December 31, 2017 (Dollars in thousands) Loan level swaps Receive fixed, pay variable 246 $ 36,023 $ 61,500 $ 152,287 $ 111,147 $ 591,385 $ 952,342 $ 3,875 Pay fixed, receive variable 231 $ 36,023 $ 61,500 $ 152,287 $ 111,147 591,385 $ 952,342 $ (3,880 ) Foreign exchange contracts Buys foreign currency, sells U.S. currency 15 $ 26,382 $ 3,780 $ — $ — $ — $ 30,162 $ 1,202 Buys U.S. currency, sells foreign currency 15 $ 26,382 $ 3,780 $ — $ — $ — $ 30,162 $ (1,188 ) (1) The Company may enter into one dealer swap agreement which offsets multiple commercial borrower swap agreements. Mortgage Derivatives Prior to closing and funding certain 1- 4 family residential mortgage loans, an interest rate lock commitment is generally extended to the borrower. During the period from commitment date to closing date, the Company is subject to the risk that market rates of interest may change. If market rates rise, investors generally will pay less to purchase such loans resulting in a reduction in the gain on sale of the loans or, possibly, a loss. In an effort to mitigate such risk, forward delivery sales commitments are executed, under which the Company agrees to deliver whole mortgage loans to various investors. These forward commitments carry a market price that has a strong inverse relationship to that of mortgage prices. Certain assumptions, including pull through rates and rate lock periods, are used in managing the existing and future economic hedges. The effectiveness of the economic hedges rely on the accuracy of these assumptions. The change in fair value on the interest rate lock commitments and forward delivery sale commitments are recorded in current period earnings as a component of mortgage banking income. In addition, the Company has elected the fair value option to carry loans held for sale at fair value. The change in fair value of loans held for sale is recorded in current period earnings as a component of mortgage banking income in accordance with the Company's fair value election. The change in fair value associated with loans held for sale was a decrease of $51,000 , a decrease of $113,000 and an increase of $87,000 for the years ended December 31 , 2018 , 2017 , and 2016 , respectively. These amounts were offset in earnings by the change in the fair value of mortgage derivatives. Additionally, the aggregate amount of net realized gains or losses on sales of such loans included within mortgage banking income amounted to $3.6 million , $4.7 million and $6.1 million for the years ended December 31 , 2018 , 2017 and 2016 , respectively. The table below presents the fair value of the Company’s derivative financial instruments as well as their classification on the balance sheet at the periods indicated: Asset Derivatives Liability Derivatives Fair Value at Fair Value at Fair Value at Fair Value at Balance Sheet December 31, 2018 December 31, 2017 Balance Sheet December 31, 2018 December 31, 2017 (Dollars in thousands) Derivatives designated as hedges Interest rate derivatives Other assets $ 8,955 $ 1,880 Other liabilities $ 391 $ 264 Derivatives not designated as hedges Customer Related Positions: Loan level derivatives Other assets 15,580 14,236 Other liabilities 15,584 14,241 Foreign exchange contracts Other assets 1,578 1,202 Other liabilities 1,548 1,188 Mortgage Derivatives Interest rate lock commitments Other assets 91 149 Other liabilities — — Forward sales agreements Other assets 106 9 Other liabilities — — 17,355 15,596 17,132 15,429 Total $ 26,310 $ 17,476 $ 17,523 $ 15,693 The table below presents the effect of the Company’s derivative financial instruments included in OCI and current earnings for the periods indicated: Years Ended December 31 2018 2017 2016 (Dollars in thousands) Derivatives designated as hedges Gain in OCI on derivatives (effective portion), net of tax $ 4,829 $ 443 $ 2,170 Gain (loss) reclassified from OCI into interest income or interest expense (effective portion) $ 1,000 $ (441 ) $ (2,520 ) Loss recognized in income on derivatives (ineffective portion and amount excluded from effectiveness testing) Interest expense $ — $ — $ — Other expense — — — Total $ — $ — $ — Derivatives not designated as hedges Changes in fair value of customer related positions Other income $ 46 $ 6 $ 73 Other expenses (29 ) (21 ) (82 ) Changes in fair value of mortgage derivatives Mortgage banking income 39 (39 ) (35 ) Total $ 56 $ (54 ) $ (44 ) The Company's derivative agreements with institutional counterparties contain various credit-risk related contingent provisions, such as requiring the Company to maintain a well-capitalized capital position. If the Company fails to meet these conditions, the counterparties could request the Company make immediate payment or demand that the Company provide immediate and ongoing full collateralization on derivative positions in net liability positions. The aggregate fair value of all derivative instruments with credit-risk related contingent features that were in a net liability position was $176,000 and $4.2 million at December 31, 2018 and December 31, 2017 , respectively. Although none of the contingency provisions have applied as of December 31, 2018 and December 31, 2017 , the Company has posted collateral to offset the net liability exposure with institutional counterparties. By using derivatives, the Company is exposed to credit risk to the extent that counterparties to the derivative contracts do not perform as required. Should a counterparty fail to perform under the terms of a derivative contract, the Company’s credit exposure on interest rate swaps is limited to the net positive fair value and accrued interest of all swaps with each counterparty. The Company seeks to minimize counterparty credit risk through credit approvals, limits, monitoring procedures, and obtaining collateral, where appropriate. Institutional counterparties must have an investment grade credit rating and be approved by the Company’s Board of Directors. As such, management believes the risk of incurring credit losses on derivative contracts with those counterparties is remote. The Company's exposure relating to institutional counterparties was $18.4 million and $7.1 million at December 31, 2018 and 2017 , respectively. The Company’s exposure relating to customer counterparties was approximately $6.4 million and $9.5 million at December 31, 2018 and 2017

BALANCE SHEET OFFSETTING

BALANCE SHEET OFFSETTING	12 Months Ended
	Dec. 31, 2018
Offsetting [Abstract]
Balance Sheet Offsetting Disclosure [Text Block]	BALANCE SHEET OFFSETTING The Company does not offset fair value amounts recognized for derivative instruments or repurchase agreements. The Company does net the amount recognized for the right to reclaim cash collateral against the obligation to return cash collateral arising from derivative instruments executed with the same counterparty under a master netting arrangement. Collateral legally required to be maintained at dealer banks by the Company is monitored and adjusted as necessary. The following tables present the Company's asset and liability derivative positions and the potential effect of netting arrangements on its financial position, as of the periods indicated: Gross Amounts Not Offset in the Statement of Financial Position Gross Amounts Recognized in the Statement of Financial Position Gross Amounts Offset in the Statement of Financial Position Net Amounts Presented in the Statement of Financial Position Financial Instruments (1) Collateral Pledged (Received) Net Amount December 31, 2018 (Dollars in thousands) Derivative Assets Interest rate swaps $ 8,955 $ — $ 8,955 $ 391 $ (5,527 ) $ 3,037 Loan level derivatives 15,580 — 15,580 6,165 (3,001 ) 6,414 Customer foreign exchange contracts 1,578 — 1,578 — — 1,578 $ 26,113 $ — $ 26,113 $ 6,556 $ (8,528 ) $ 11,029 Derivative Liabilities Interest rate swaps $ 391 $ — $ 391 $ 391 $ — $ — Loan level derivatives 15,584 — 15,584 6,165 173 9,246 Customer foreign exchange contracts 1,548 — 1,548 — — 1,548 $ 17,523 $ — $ 17,523 $ 6,556 $ 173 $ 10,794 (1) Reflects offsetting derivative positions with the same counterparty. Gross Amounts Not Offset in the Statement of Financial Position Gross Amounts Recognized in the Statement of Financial Position Gross Amounts Offset in the Statement of Financial Position Net Amounts Presented in the Statement of Financial Position Financial Instruments (1) Collateral Pledged (Received) Net Amount December 31, 2017 (Dollars in thousands) Derivative Assets Interest rate swaps $ 1,880 $ — $ 1,880 $ 805 $ — $ 1,075 Loan level derivatives 14,236 — 14,236 4,578 — 9,658 Customer foreign exchange contracts 1,202 — 1,202 — — 1,202 $ 17,318 $ — $ 17,318 $ 5,383 $ — $ 11,935 Derivative Liabilities Interest rate swaps $ 264 $ — $ 264 $ — $ 264 $ — Loan level derivatives 14,241 — 14,241 5,383 3,675 5,183 Customer foreign exchange contracts 1,188 — 1,188 — — 1,188 $ 15,693 $ — $ 15,693 $ 5,383 $ 3,939 $ 6,371 Customer repurchase agreements $ 162,679 $ — $ 162,679 $ — $ 162,679 $ — (1)

INCOME TAXES

INCOME TAXES	12 Months Ended
	Dec. 31, 2018
Income Tax Disclosure [Abstract]
INCOME TAXES	INCOME TAXES On December 22, 2017, the Tax Act was signed into law, reducing the corporate income tax rate from 35% to 21%. At December 31, 2017, the Company had not completed its accounting for the tax effect of enactment of the Tax Act; however, it made a reasonable estimate of the effects on its existing deferred tax balances. As a result of this rate reduction, the Company remeasured certain deferred tax assets and liabilities at December 31, 2017 based on the rates at which they are expected to reverse in the future, which is generally 21% for Federal tax purposes. This remeasurement of deferred tax assets and liabilities resulted in a provisional amount recorded of $1.9 million . Also at December 31, 2017, the Company had also recognized a provisional estimate of $466,000 to reassess the value of its low income housing projects investments ("LIHTC investments"). As of December 31, 2018, the Company completed its accounting for all of the enactment-date income tax effects of the Tax Act. The Company's tax expense for the year ended December 31, 2018 included an increase of $71,000 related to the provisional estimate recorded on the remeasurement of deferred tax asset and liabilities in 2017, mainly attributable to remeasurement of temporary differences. There was no change to this provisional amount recorded in 2017 related to the Company's LIHTC investments. The impact of these provisional amounts are included in the disclosures below. The provision for income taxes is comprised of the following components: Years Ended December 31 2018 2017 2016 (Dollars in thousands) Current expense Federal $ 25,129 $ 28,852 $ 26,549 State 13,672 9,278 8,883 Total current expense 38,801 38,130 35,432 Deferred expense (benefit) Federal (3,080 ) 7,953 153 State (1,417 ) 1,258 (158 ) Total deferred expense (benefit) (4,497 ) 9,211 (5 ) Total expense $ 34,304 $ 47,341 $ 35,427 The difference between the statutory federal income tax rate and the effective income tax rate reported for the last three years is detailed below: Years Ended December 31 2018 2017 2016 (Dollars in thousands) Computed statutory federal income tax provision $ 32,744 21.00 % $ 47,091 35.00 % $ 39,226 35.00 % State taxes, net of federal tax benefit 9,633 6.18 % 6,817 5.07 % 5,643 5.03 % Merger and other related costs (non-deductible) 130 0.08 % 213 0.16 % 210 0.19 % Change in valuation allowance 49 0.03 % 31 0.02 % 28 0.02 % Revaluation of net deferred tax assets — — % 1,895 1.41 % — — % New Markets Tax Credits (3,960 ) (2.54 )% (3,960 ) (2.94 )% (6,360 ) (5.67 )% Increase in cash surrender value of life insurance (1,160 ) (0.74 )% (1,445 ) (1.07 )% (1,431 ) (1.28 )% Low Income Housing Project Investments (1,030 ) (0.66 )% (1,253 ) (0.93 )% (1,641 ) (1.46 )% Stock-based compensation (885 ) (0.57 )% (1,258 ) (0.94 )% — — % Nontaxable interest, net (566 ) (0.36 )% (987 ) (0.73 )% (996 ) (0.89 )% Other, net (651 ) (0.42 )% 197 0.15 % 748 0.67 % Total expense $ 34,304 22.00 % $ 47,341 35.20 % $ 35,427 31.61 % The tax-effected components of the net deferred tax asset at December 31 were as follows: 2018 2017 (Dollars in thousands) Deferred tax assets Accrued expenses not deducted for tax purposes $ 11,922 $ 9,268 Allowance for loan losses 17,764 16,702 Deferred gain on sale leaseback transaction 704 909 Employee and director equity compensation 1,636 1,559 Federal Home Loan Bank borrowings fair value adjustment 15 26 Loan basis difference fair value adjustment 4,761 3,070 Net operating loss carry-forward 170 127 Net unrealized loss on securities available for sale 1,850 106 Other 842 527 Gross deferred tax assets 39,664 32,294 Valuation allowance (170 ) (121 ) Total deferred tax assets net of valuation allowance $ 39,494 $ 32,173 Deferred tax liabilities Core deposit and other intangibles $ 3,803 $ 2,057 Deferred loan fees, net 4,759 4,275 Derivatives fair value adjustment 2,413 524 Fixed assets 5,259 5,270 Goodwill 10,388 10,265 Prepaid pension 3,483 3,056 Other 1,139 1,251 Gross deferred tax liabilities $ 31,244 $ 26,698 Total net deferred tax asset $ 8,250 $ 5,475 Deferred tax assets are to be reduced by a valuation allowance if, based on the weight of available evidence, it is more likely than not that some portion or all of the deferred tax assets will not be realized. The realization of the tax benefit depends upon the existence of sufficient taxable income within the carry-back and future periods. The Company believes that it is more likely than not that its deferred tax assets as of December 31, 2018 , excluding the deferred tax asset on certain state net operating losses, will be realized through the utilization of carry-back provisions to taxable income on prior years, future reversals of existing taxable temporary differences and by offsetting other future taxable income. The Company believes it is more likely than not that the deferred tax asset related to certain state net operating losses generated from the Company's investments in low income housing partnerships, which expire over a 20-year period, will not be realized and has recorded a valuation allowance of $170,000 at December 31, 2018 , attributable to this deferred tax asset. The Company does not have a federal net operating loss carry forward or general business credit carry forward subject to expiration as of December 31, 2018 . Uncertainty in Income Taxes The Company and its subsidiaries file income tax returns in the U.S. federal jurisdiction as well as in various states. The Company is subject to U.S. federal, state and local income tax examinations by tax authorities for the 2015 through 2017 tax years including any related income tax filings from its recent acquisitions. The Company believes that its income tax returns have been filed based upon applicable statutes, regulations and case law in effect at the time of filing, however, the Internal Revenue Service ("IRS") and /or state jurisdictions could disagree with the Company's interpretation upon examination. The Company accounts for uncertainties in income taxes by providing a tax reserve for certain positions. The following is a reconciliation of the beginning and ending amount of unrecognized tax benefits: (Dollars in thousands) Balance at December 31, 2016 $ 111 Increase for current year tax positions 31 Balance at December 31, 2017 142 Increase for current year tax positions 73 Balance at December 31, 2018 $ 215 Increases to the Company's unrealized tax positions occur as a result of accruing for the unrecognized tax benefit as well the accrual of interest and penalties related to prior year positions. Decreases in the Company's unrealized tax positions occur as a result of the statute of limitation lapsing on prior year positions and/or settlements relating to outstanding positions. The table above does not include the indirect federal benefit of state tax positions of approximately $39,000 . All of the Company’s unrecognized tax benefits, including the indirect federal benefit of state tax positions, are recorded as a component of income tax expense. During the years ended December 31, 2018 , 2017 and 2016 the Company recognized approximately $24,000 , $18,000 and $11,000 in the provision for income taxes for interest and penalties related to uncertain tax positions. As such, the Company has accrued approximately $53,000 , $29,000 and $11,000 for the payment of interest and penalties as of December 31, 2018 , 2017 and 2016

LOW INCOME HOUSING PROJECT INVE

LOW INCOME HOUSING PROJECT INVESTMENTS Low Income Housing Project Investments	12 Months Ended
	Dec. 31, 2018
Low Income Housing Project Investments [Abstract]
Investments in Low Income Housing Projects [Text Block]	LOW INCOME HOUSING PROJECT INVESTMENTS The Company has invested in low income housing projects that generate Low Income Housing Tax Credits (“LIHTC”) which provide the Company with tax credits and operating loss tax benefits over a period of approximately 15 years. None of the original investment is expected to be repaid. The following table presents certain information related to the Company's investments in low income housing projects as of December 31: 2018 2017 2016 (Dollars in thousands) Original investment value $ 50,232 $ 47,399 $ 47,379 Current recorded investment $ 33,681 $ 35,225 $ 39,606 Unfunded liability obligation $ 3,935 $ 4,536 $ 12,161 Tax credits and benefits earned during the year $ 5,407 $ 5,654 $ 5,366 Amortization of investments during the year (1) $ 4,377 $ 4,402 $ 3,725 Net income tax benefit recognized during the year $ 1,030 $ 1,253 $ 1,641 (1) The 2017 amount is inclusive of $466,000

EMPLOYEE BENEFIT PLANS

EMPLOYEE BENEFIT PLANS	12 Months Ended
	Dec. 31, 2018
Retirement Benefits [Abstract]
EMPLOYEE BENEFIT PLANS	EMPLOYEE BENEFIT PLANS Pension The Company maintains a multiemployer defined benefit pension plan (the “Pension Plan”) administered by Pentegra Retirement Services (the “Fund” or “Pentegra Defined Benefit Plan for Financial Institutions”). The Fund does not segregate the assets or liabilities of all participating employers and accordingly, disclosure of plan assets, accumulated vested and nonvested benefits is not possible. Effective July 1, 2006, the Company froze the defined benefit plan by eliminating all future benefit accruals. In conjunction with the acquisition of Peoples Federal Bancshares, Inc., the parent of Peoples Federal Savings Bank ("Peoples") in 2015, the Company acquired the Peoples Federal Defined Benefit Pension Plan (“Peoples Plan”). The Peoples Plan was frozen at the date of acquisition and will be maintained in the same manner as the Pension Plan. The Peoples Plan is also administered by Pentegra Retirement Services under the same Fund as the Pension Plan. Additionally, in conjunction with the acquisition of Island Bancorp in 2017, the Company acquired the Edgartown National Bank Employee’s Retirement Plan. This pension plan was frozen at the date of acquisition and was subsequently dissolved. The Company’s participation in the Pension Plan and the Peoples Plan (the "Pension Plans") for the annual period ended December 31, 2018 , is outlined in the table below. The “EIN/Pension Plan Number” column provides the Employer Identification Number (“EIN”) and the three-digit plan number. The funding status of the Pension Plans is determined on the basis of the financial statements provided by the Fund using total plan assets and accumulated benefit obligation. The “FIP/RP Status Pending/Implemented” column indicates plans for which a financial improvement plan (“FIP”) or a rehabilitation plan (“RP”) is either pending or has been implemented. The “Expiration Date of Collective-Bargaining Agreement” column lists the expiration dates of any collective-bargaining agreement(s) to which the Pension Plans are subject. Funding Status FIP/RP Status Surcharge Expiration Minimum EIN/Pension 2018 2017 Pentegra defined benefit plan for financial institutions 13-5645888/333 At least 80 percent At least 80 percent No No N/A $ — Contributions to the Fund are based on each individual employer’s experience. The Company bears the market risk relating to the Pension Plan and will continue to fund the Pension Plan as required. The Pension Plan year is July 1 st through June 30 th . The Company’s total contributions to the Pension Plan did not represent more than 5% of the total contributions to the Pension Plan as indicated in the Pension Plan’s most recently available annual report dated June 30, 2018 . The comparability of employer contributions is impacted by asset performance, discount rates and the reduction in the number of covered employees year over year. The Company’s contributions to the Pension Plans were as follows for the periods indicated: Required Contributions - Plan Year Allocation Cash Payment Future period funding 2018-2019 2017-2018 2016-2017 (Dollars in thousands) 2018 $ 2,642 $ 2,000 $ 642 $ — $ — 2017 $ 6,432 $ 5,000 $ — $ 1,432 $ — 2016 $ 6,245 $ 4,000 $ — $ — $ 2,245 The Company’s total defined benefit plan expense was $1.1 million , $1.9 million , and $2.0 million , for the years ending December 31, 2018 , 2017 , and 2016 , respectively. Financial information for the Fund is made available through the public Form 5500 which is available by April 15 th of the year following the plan year end. Postretirement Benefit Plans Employees retiring from the Bank after attaining age 65 , who have rendered at least 10 years of continuous full time service with Rockland Trust are entitled to a fixed contribution toward the premium for postretirement health care benefits and a $5,000 benefit paid upon death. The health care benefits are subject to deductibles, co-payment provisions and other limitations. The Bank may amend or change these benefits periodically. Additionally, the Company has acquired small postretirement plans and/or agreements in conjunction with various acquisitions. The expense related to these plans for the years ending December 31, 2018 , 2017 , and 2016 was not material. Supplemental Executive Retirement Plans The Bank maintains frozen defined benefit supplemental executive retirement plans (“SERP”) for certain highly compensated employees designed to offset the impact of regulatory limits on benefits under qualified pension plans. The Bank also maintains defined benefit SERPs acquired from previous acquisitions. The Bank has established and funded Rabbi Trusts to accumulate funds in order to satisfy the contractual liability of these supplemental retirement plan benefits. These agreements provide for the Bank to pay all benefits from its general assets, and the establishment of these trust funds does not reduce nor otherwise affect the Bank’s continuing liability to pay benefits from such assets except that the Bank’s liability shall be offset by actual benefit payments made from the trusts. The related trust assets included in the Company's available for sale securities portfolio totaled $16.6 million and $16.2 million at December 31, 2018 and 2017 , respectively. The following table shows the defined benefit supplemental retirement expense, and the contributions paid to the plans which were used only to pay the current year benefits as of the dates indicated: 2018 2017 2016 (Dollars in thousands) Retirement expense $ 1,683 $ 1,580 $ 1,513 Contributions paid $ 434 $ 367 $ 320 Expected future benefit payments for the defined benefit supplemental executive retirement plans are presented below: Defined Benefit Supplemental Executive (Dollars in thousands) 2019 $ 482 2020 $ 467 2021 $ 461 2022 $ 454 2023 $ 568 2024-2028 $ 5,940 The measurement date used to determine the defined benefit supplemental executive retirement plans' benefits is December 31 for each of the years reported. The following table illustrates the status of the defined benefit supplemental executive retirement plans at December 31 for the years presented: Defined Benefit Supplemental Executive 2018 2017 2016 (Dollars in thousands) Change in accumulated benefit obligation Benefit obligation at beginning of year $ 15,749 $ 14,177 $ 13,290 Service cost 459 423 395 Interest cost 533 547 539 Actuarial loss (gain) (1,344 ) 969 273 Benefits paid (434 ) (367 ) (320 ) Benefit obligation at end of year $ 14,963 $ 15,749 $ 14,177 Change in plan assets Fair value of plan assets at beginning of year $ — $ — $ — Employer contribution 434 367 320 Benefits paid (434 ) (367 ) (320 ) Fair value of plan assets at end of year $ — $ — $ — Funded status at end of year $ (14,963 ) $ (15,749 ) $ (14,177 ) Assets — — — Liabilities (14,963 ) (15,749 ) (14,177 ) Funded status at end of year $ (14,963 ) $ (15,749 ) $ (14,177 ) Amounts recognized in accumulated other comprehensive income (“AOCI”) Net loss $ 1,705 $ 3,465 $ 2,830 Prior service cost 770 1,047 1,323 Amounts recognized in AOCI $ 2,475 $ 4,512 $ 4,153 Information for plans with an accumulated benefit obligation in excess of plan assets Projected benefit obligation $ 14,963 $ 15,749 $ 14,177 Accumulated benefit obligation $ 14,963 $ 15,749 $ 14,177 Net periodic benefit cost Service cost $ 459 $ 423 $ 395 Interest cost 533 547 539 Amortization of prior service cost 276 276 276 Recognized net actuarial loss 415 334 303 Net periodic benefit cost $ 1,683 $ 1,580 $ 1,513 Amounts in accumulated other comprehensive income expected to be recognized in net periodic benefit cost over next fiscal year Net actuarial loss $ 41 $ 415 $ 338 Net prior service cost $ 276 $ 276 $ 276 Discount rate used for benefit obligation 3.24 - 4.09% 2.48-3.45% 2.49-3.94% Discount rate used for net periodic benefit cost 2.48 - 3.45% 2.49-3.94% 2.49-4.16% Rate of compensation increase n/a n/a n/a Other Employee Benefits The Bank may choose to create an incentive compensation plan for senior management and other officers to participate in at varying levels. In addition, the Bank may also pay a discretionary bonus to senior management, officers, and/or non-officers of the Bank. The expense for the incentive plans and the discretionary bonus amounted to $13.8 million , $10.9 million and $10.3 million in 2018 , 2017 and 2016 , respectively. The Bank has an Employee Savings Plan that qualifies as a deferred salary arrangement under Section 401(k) of the Internal Revenue Code. Under the Employee Savings Plan, participating employees may defer a portion of their earnings, not to exceed the Internal Revenue Service annual contribution limits. The Bank matches 25% of each employee’s contributions up to the first 6% of the employee’s earnings. The 401(k) Plan incorporates an Employee Stock Ownership Plan for contributions invested in the Company’s common stock. This Plan also provides nondiscretionary contributions in which employees, with one year and 1,000 hours of service, receive a 5% cash contribution of eligible pay up to the social security limit and a 10% cash contribution of eligible pay over the social security limit up to the maximum amount permitted by law. Benefits contributed to employees under this defined contribution plan vest immediately. The defined contribution plan expense was $5.4 million , $5.0 million and $4.8 million for the years ended December 2018 , 2017 and 2016 , respectively. The Company has a non-qualified deferred compensation plan which allows for deferrals of incentive payments until an elected distribution date in the future. This deferred compensation plan is available to certain highly compensated employees. Deferrals are invested at the election of the participant into one of the actively managed funds made available to the participant through the Company's Investment Management Group. The funds are held in a Rabbi Trust until the elected date of distribution. The Company has a non-qualified 401(k) Restoration Plan ("Restoration Plan") for certain executive officers. The Restoration Plan is intended to contribute to each participant the amount of matching and discretionary contributions which would have been made to the existing Rockland Trust 401(k) plan on the participant's behalf, but were prohibited due to Internal Revenue Code limitations. Deferrals are invested at the election of the participant into one of the actively managed funds made available to the participant through the Company's Investment Management Group or in the Company's stock. These funds are held in a Rabbi Trust until the elected date of distribution. The Company recognized expense of $278,000 , $267,000 and $425,000 related to this plan for services performed for the years ended December 31, 2018 , 2017 and 2016 , respectively. As a result of the acquisition of Peoples in 2015, the Company assumed an Employee Stock Ownership Plan and a 401(k) Plan. The Company received approval and terminated both plans during 2016, and as such, there was no expense associated with either plan during 2018 , 2017 and 2016 . Also as part of the Peoples acquisition in 2015, the Company assumed various Salary Continuation Agreements with certain current and former senior executives. The agreements require the payment of specified benefits upon retirement over periods of ten or twenty years as described in each agreement. Expense related to the Salary Continuation Agreements was $287,000 , $279,000 and $272,000 for the years ended December 31, 2018 , 2017 and 2016 , respectively. The Company also assumed a Peoples supplemental retirement plan with a former executive, whereby the amounts paid under this plan commenced upon the executive's retirement and continue for his lifetime. The expense related to the supplemental retirement plan for the years ended December 31, 2018 , 2017 and 2016 was not material. Director Benefits The Company maintains two deferred compensation plans for the Company’s Board of Directors which permit non-employee directors to defer cash fees, one which was in effect through December 31, 2018 and a new plan which was adopted effective January 1, 2019. Under the plan in effect through December 31, 2018, deferred compensation is invested in Company stock and held by the Company's Investment Management Group. The amount of compensation deferred during 2018 , 2017 , and 2016 was $142,000 , $143,000 , and $142,000 , respectively. As a result of the Peoples acquisition during 2015, the Company assumed several Director Retirement Agreements. The agreements require the payment of specified benefits upon retirement over periods of ten or twenty years as described in each agreement. The expense related to the Director Retirement Agreements for the years ended December 31, 2018 , 2017 and 2016

FAIR VALUE MEASUREMENTS

FAIR VALUE MEASUREMENTS	12 Months Ended
	Dec. 31, 2018
Fair Value Disclosures [Abstract]
FAIR VALUE MEASUREMENTS	FAIR VALUE MEASUREMENTS During the fourth quarter of 2018, the Company early adopted ASU 2018-13, Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement to remove various disclosures related to recurring or nonrecurring fair value measurements. The disclosure requirements that were added under this standard were already disclosed by the Company. This new standard was adopted retrospectively and did not have a material impact on the Company's consolidated financial position. Fair value is a market-based measure considered from the perspective of a market participant rather than an entity-specific measure. Therefore, even when market assumptions are not readily available, the Company’s own assumptions are set to reflect those that market participants would use in pricing the asset or liability at the measurement date. If there has been a significant decrease in the volume and level of activity for the asset or liability, regardless of the valuation technique(s) used, the objective of a fair value measurement remains the same. Fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction (that is, not a forced liquidation or distressed sale) between market participants at the measurement date under current market conditions. The Company uses prices and inputs that are current as of the measurement date. In periods of market dislocation, the observability of prices and inputs may be reduced for many instruments. This condition could cause an instrument to be reclassified from one level to another. The Fair Value Measurements and Disclosures Topic of the FASB ASC defines fair value and establishes a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements). The three levels of the fair value hierarchy under the Fair Value Measurements and Disclosures Topic of the FASB ASC are described below: Level 1 – Inputs are quoted prices (unadjusted) in active markets for identical assets or liabilities that the reporting entity has the ability to access at the measurement date. Level 2 – Valuations based on quoted prices in markets that are not active or for which all significant inputs are observable, either directly or indirectly. Level 3 – Prices or valuations that require inputs that are both significant to the fair value measurement and unobservable. To the extent that valuation is based on models or inputs that are less observable or unobservable in the market, the determination of fair value requires more judgment. Accordingly, the degree of judgment exercised by the Company in determining fair value is greatest for instruments categorized in Level 3. A financial instrument’s level within the fair value hierarchy is based on the lowest level of any input that is significant to the fair value measurement. Valuation Techniques There have been no changes in the valuation techniques used during the current period. Securities: Trading and Equity Securities These equity securities are valued based on market quoted prices. These securities are categorized in Level 1 as they are actively traded and no valuation adjustments have been applied. U.S. Government Agency Securities Fair value is estimated using either multi-dimensional spread tables or benchmarks. The inputs used include benchmark yields, reported trades, and broker/dealer quotes. These securities are classified as Level 2. Agency Mortgage-Backed Securities Fair value is estimated using either a matrix or benchmarks. The inputs used include benchmark yields, reported trades, broker/dealer quotes, and issuer spreads. These securities are categorized as Level 2. Agency Collateralized Mortgage Obligations and Small Business Administration Pooled Securities The valuation model for these securities is volatility-driven and ratings based, and uses multi-dimensional spread tables. The inputs used include benchmark yields, reported trades, new issue data, broker dealer quotes, and collateral performance. If there is at least one significant model assumption or input that is not observable, these securities are categorized as Level 3 within the fair value hierarchy; otherwise, they are classified as Level 2. State, County, and Municipal Securities The fair value is estimated using a valuation matrix with inputs including bond interest rate tables, recent transaction, and yield relationships. These securities are categorized as Level 2. Single and Pooled Issuer Trust Preferred Securities The fair value of trust preferred securities, including pooled and single issuer preferred securities, is estimated using external pricing models, discounted cash flow methodologies or similar techniques. The inputs used in these valuations include benchmark yields, reported trades, new issue data, broker dealer quotes, and collateral performance. If there is at least one significant model assumption or input that is not observable, these securities are classified as Level 3 within the fair value hierarchy; otherwise, they are classified as Level 2. Loans Held for Sale The Company has elected the fair value option to account for originated closed loans intended for sale. The fair value is measured on an individual loan basis using quoted market prices and when not available, comparable market value or discounted cash flow analysis may be utilized. These assets are typically classified as Level 2. Derivative Instruments Derivatives The valuation of these instruments is determined using widely accepted valuation techniques including discounted cash flow analysis on the expected cash flows of each derivative. This analysis reflects the contractual terms of the derivatives, including the period to maturity, and uses observable market-based inputs, including interest rate curves and implied volatilities. The Company incorporates credit valuation adjustments to appropriately reflect nonperformance risk in the fair value measurements. In adjusting the fair value of its derivative contracts for the effect of nonperformance risk, the Company has considered the impact of netting and any applicable credit enhancements, such as collateral postings. Additionally, in conjunction with fair value measurement guidance, the Company has made an accounting policy election to measure the credit risk of its derivative financial instruments that are subject to master netting agreements on a net basis by counterparty portfolio. Although the Company has determined that the majority of the inputs used to value its interest rate derivatives fall within Level 2 of the fair value hierarchy, the credit valuation adjustments associated with its derivatives utilize Level 3 inputs, such as estimates of current credit spreads to evaluate the likelihood of default by the Company and its counterparties. However, as of December 31, 2018 and 2017 , the Company has assessed the significance of the impact of the credit valuation adjustments on the overall valuation of its derivative positions and has determined that the credit valuation adjustments are not significant to the overall valuation of its derivatives. As a result, the Company has determined that its derivative valuations in their entirety are classified in Level 2. Mortgage Derivatives The fair value of mortgage derivatives is determined based on current market prices for similar assets in the secondary market and, therefore, classified as Level 2 within the fair value hierarchy. Impaired Loans Collateral dependent loans that are deemed to be impaired are valued based upon the lower of cost or fair value of the underlying collateral less costs to sell. The inputs used in the appraisals of the collateral are not always observable, and therefore the loans may be classified as Level 3 within the fair value hierarchy; otherwise, they are classified as Level 2. Other Real Estate Owned and Other Foreclosed Assets The fair values are generally estimated based upon recent appraisal values of the property less costs to sell the property, as Other Real Estate Owned ("OREO") and Other Foreclosed Assets are valued at the lower of cost or fair value of the property, less estimated costs to sell. Certain inputs used in appraisals are not always observable, and therefore OREO and Other Foreclosed Assets are classified as Level 3 within the fair value hierarchy. Goodwill and Other Intangible Assets Goodwill and identified intangible assets are subject to impairment testing. The Company conducts an annual impairment test of goodwill in the third quarter of each year, or more frequently if necessary, and other intangible assets are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of the assets may not be recoverable. To estimate the fair value of goodwill and, if necessary, other intangible assets, the Company utilizes both a comparable analysis of relevant price multiples in recent market transactions and discounted cash flow analysis. Both valuation models require a significant degree of management judgment. In the event the fair value as determined by the valuation model is less than the carrying value, the intangibles may be impaired. If the impairment testing resulted in impairment, the Company would classify the impaired goodwill and other intangible assets subjected to nonrecurring fair value adjustments as Level 3. Assets and liabilities measured at fair value on a recurring and nonrecurring basis were as follows as of the dates indicated: Fair Value Measurements at Reporting Date Using Balance Quoted Prices in Significant Other Significant December 31, 2018 (Dollars in thousands) Recurring fair value measurements Assets Trading securities $ 1,504 $ 1,504 $ — $ — Equity securities 19,477 19,477 — — Securities available for sale U.S. Government agency securities 32,038 — 32,038 — Agency mortgage-backed securities 220,105 — 220,105 — Agency collateralized mortgage obligations 134,911 — 134,911 — State, county, and municipal securities 1,735 — 1,735 — Single issuer trust preferred securities issued by banks and insurers 707 — 707 — Pooled trust preferred securities issued by banks and insurers 1,329 — — 1,329 Small business administration pooled securities 51,927 — 51,927 — Loans held for sale 6,431 — 6,431 — Derivative instruments 26,310 — 26,310 — Liabilities Derivative instruments 17,523 — 17,523 — Total recurring fair value measurements $ 478,951 $ 20,981 $ 456,641 $ 1,329 Nonrecurring fair value measurements Assets Collateral dependent impaired loans $ 29,109 $ — $ — $ 29,109 Total nonrecurring fair value measurements $ 29,109 $ — $ — $ 29,109 Fair Value Measurements at Reporting Date Using Balance Quoted Prices in Significant Other Significant December 31, 2017 (Dollars in thousands) Recurring fair value measurements Assets Trading securities $ 1,324 $ 1,324 $ — $ — Securities available for sale U.S. Government agency securities 35,430 $ — 35,430 — Agency mortgage-backed securities 215,764 — 215,764 — Agency collateralized mortgage obligations 122,012 — 122,012 — State, county, and municipal securities 2,274 — 2,274 — Single issuer trust preferred securities issued by banks and insurers 2,016 — 2,016 — Pooled trust preferred securities issued by banks and insurers 1,640 — — 1,640 Small business administration pooled securities 47,778 — 47,778 — Equity securities 20,584 20,584 — — Loans held for sale 4,768 — 4,768 — Derivative instruments 17,476 — 17,476 — Liabilities Derivative instruments 15,693 — 15,693 — Total recurring fair value measurements $ 455,373 $ 21,908 $ 431,825 $ 1,640 Nonrecurring fair value measurements: Assets Collateral dependent impaired loans $ 33,567 $ — $ — $ 33,567 Other real estate owned and other foreclosed assets 612 — — 612 Total nonrecurring fair value measurements $ 34,179 $ — $ — $ 34,179 All assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) were valued using pricing models and discounted cash flow methodologies, as of December 31, 2018 , 2017 and 2016 . This reconciliation is presented in the table below, for the periods indicated: 2018 2017 2016 (Dollars in thousands) Pooled Trust Preferred Securities Beginning balance $ 1,640 $ 1,584 $ 1,572 Gain and (losses) (realized/unrealized) Included in earnings — — — Included in other comprehensive income 191 77 29 Settlements (502 ) (21 ) (17 ) Ending Balance $ 1,329 $ 1,640 $ 1,584 The following table sets forth certain unobservable inputs regarding the Company's financial instruments that are classified as Level 3 as of December 31st for the years indicated: Valuation Technique Fair Value Unobservable Inputs Range Weighted Average 2018 2017 2018 2017 2018 2017 (Dollars in thousands) Discounted cash flow methodology Pooled trust preferred securities $ 1,329 $ 1,640 Cumulative prepayment 0% - 59% 0% - 61% 2.1% 2.5% Cumulative default 5% - 100% 5% - 100% 16.2% 12.4% Loss given default 85% - 100% 85% - 100% 94.8% 94.3% Cure given default 0% - 75% 0% - 75% 60.9% 60.9% Appraisals of collateral (1) Collateral dependent impaired loans $ 29,109 $ 33,567 Other real estate owned and foreclosed assets $ — $ 612 (1) Fair value is generally determined through independent appraisals of the underlying collateral, which generally include various Level 3 inputs which are not identifiable. Appraisals may be adjusted by management for qualitative factors such as economic factors and estimated liquidation expenses. The range of these possible adjustments may vary. The significant unobservable inputs used in the fair value measurement of the Company’s pooled trust preferred securities are cumulative prepayment rates, cumulative defaults, loss given defaults and cure given defaults. Significant increases (decreases) in deferrals or defaults, in isolation, would result in a significantly lower (higher) fair value measurement. Alternatively, significant increases (decreases) in cure rates, in isolation, would result in a significantly higher (lower) fair value measurement. The estimated fair values and related carrying amounts for assets and liabilities for which fair value is only disclosed are shown below as of the periods indicated: Fair Value Measurements at Reporting Date Using Carrying Value Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) December 31, 2018 (Dollars in thousands) Financial assets Securities held to maturity(a) U.S. Treasury securities $ 1,004 $ 1,015 $ — $ 1,015 $ — Agency mortgage-backed securities 252,484 250,928 — 250,928 — Agency collateralized mortgage obligations 332,775 326,724 — 326,724 — Single issuer trust preferred securities issued by banks 1,500 1,490 — 1,490 — Small business administration pooled securities 23,727 23,483 — 23,483 — Loans, net of allowance for loan losses(b) 6,812,792 6,635,209 — — 6,635,209 Federal Home Loan Bank stock(c) 15,683 15,683 — 15,683 — Cash surrender value of life insurance policies(d) 160,456 160,456 — 160,456 — Financial liabilities Deposit liabilities, other than time deposits(e) $ 6,716,017 $ 6,716,017 $ — $ 6,716,017 $ — Time certificates of deposits(f) 711,103 703,728 — 703,728 $ — Federal Home Loan Bank borrowings(f) 147,806 147,603 — 147,603 — Junior subordinated debentures(g) 76,173 73,827 — 73,827 — Subordinated debentures(f) 34,728 32,509 — — 32,509 Fair Value Measurements at Reporting Date Using Carrying Value Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) December 31, 2017 Financial assets (Dollars in thousands) Securities held to maturity(a) U.S. Treasury securities $ 1,006 $ 1,035 $ — $ 1,035 $ — Agency mortgage-backed securities 204,768 205,823 — 205,823 — Agency collateralized mortgage obligations 262,998 258,408 — 258,408 — Single issuer trust preferred securities issued by banks 1,500 1,529 — 1,529 — Small business administration pooled securities 27,416 27,399 — 27,399 — Loans, net of allowance for loan losses(b) 6,261,343 6,116,051 — — 6,116,051 Federal Home Loan Bank stock(c) 11,597 11,597 — 11,597 — Cash surrender value of life insurance policies(d) 151,528 151,528 — 151,528 — Financial liabilities Deposit liabilities, other than time deposits(e) $ 6,084,952 $ 6,084,952 $ — $ 6,084,952 $ — Time certificates of deposits(f) 644,301 639,060 — 639,060 — Federal Home Loan Bank borrowings(f) 53,264 52,111 — 52,111 — Customer repurchase agreements and other short-term borrowings(f) 162,679 162,679 — — 162,679 Junior subordinated debentures(g) 73,073 74,680 — 74,680 — Subordinated debentures(f) 34,682 32,707 — — 32,707 (a) The fair values presented are based on quoted market prices, where available. If quoted market prices are not available, fair values are based on quoted market prices of comparable instruments and/or discounted cash flow analysis. (b) Fair value is estimated by discounting the future cash flows using the current rates at which similar loans would be made to borrowers with similar credit ratings and for the same remaining maturities or cash flows. Additionally, this amount excludes collateral dependent impaired loans, which are deemed to be marked to fair value on a nonrecurring basis. (c) FHLB stock has no quoted market value and is carried at cost, therefore the carrying amount approximates fair value. (d) Cash surrender value of life insurance is recorded at its cash surrender value (or the amount that can be realized upon surrender of the policy), therefore carrying amount approximates fair value. (e) Fair value of demand deposits, savings and interest checking accounts and money market deposits is the amount payable on demand at the reporting date. (f) Fair value was determined by discounting anticipated future cash payments using rates currently available for instruments with similar remaining maturities. (g) Fair value was determined based upon market prices of securities with similar terms and maturities. This summary excludes certain financial assets and liabilities for which the carrying value approximates fair value. For financial assets, these may include cash and due from banks, federal funds sold and short-term investments. For financial liabilities, these may include federal funds purchased. These instruments would all be considered to be classified as Level 1 within the fair value hierarchy. Also excluded from the summary are financial instruments measured at fair value on a recurring and nonrecurring basis, as previously described.

REVENUE RECOGNITION (Notes)

REVENUE RECOGNITION (Notes)	12 Months Ended
	Dec. 31, 2018
Revenue Recognition [Abstract]
Revenue from Contract with Customer [Text Block]	REVENUE RECOGNITION The Company adopted the new revenue recognition standard under Accounting Standards Codification Topic 606 ("ASC 606") as of January 1, 2018 and is using the modified retrospective transition method upon adoption. The Company determined that there were no material changes to be made to revenue recognition upon adoption and that there were no practical expedients to apply to its contracts. A portion of the Company's noninterest income is derived from contracts with customers, and as such, the revenue recognized depicts the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The Company considers the terms of the contract and all relevant facts and circumstances when applying this guidance. To ensure its alignment with this core principle, the Company measures revenue and the timing of recognition by applying the following five steps: 1. Identify the contract(s) with customers 2. Identify the performance obligations 3. Determine the transaction price 4. Allocate the transaction price to the performance obligations 5. Recognize revenue when (or as) the entity satisfies a performance obligation The Company has disaggregated its revenue from contracts with customers into categories that depict how the nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factors. The following table presents the revenue streams that the Company has disaggregated as of the periods indicated: Years Ended December 31 2018 2017 2016 (Dollars in thousands) Deposit account fees (inclusive of cash management fees) $ 18,327 $ 17,822 $ 18,652 Interchange fees 15,433 13,899 12,842 ATM fees 2,961 2,938 3,093 Investment management - wealth management and advisory services 23,441 21,644 19,587 Investment management - retail investments and insurance revenue 2,714 2,158 2,222 Merchant processing income 1,401 1,229 1,206 Other noninterest income 4,432 4,569 4,273 Total noninterest income in-scope of ASC 606 68,709 64,259 61,875 Total noninterest income out-of-scope of ASC 606 19,796 18,735 20,553 Total noninterest income $ 88,505 82,994 $ 82,428 In each of the revenue streams identified above, there were no significant judgments made in determining or allocating the transaction price, as the consideration and service requirements are generally explicitly identified in the associated contracts. Additional information related to each of the revenue streams is further noted below: Deposit Account Fees The Company offers various deposit account products to its customers governed by specific deposit agreements applicable to either personal customers or business customers. These agreements identify the general conditions and obligations of both parties, and include standard information regarding deposit account related fees. Deposit account services include providing access to deposit accounts as well as access to the various deposit transactional services of the Company. These transactional services are primarily those that are identified in the standard fee schedule, and include, but are not limited to, services such as overdraft protection, wire transfer, and check collection. Revenue is recognized in conjunction with the various services being provided. For example, the Company may assess monthly fixed service fees associated with the customer having access to the deposit account, which can vary depending on the account type and daily account balance. In addition, the Company may also assess separate fixed fees associated with and at the time specific transactions are entered in to by the customer. As such, the Company considers its performance obligations to be met concurrently with providing the account access or completing the requested deposit transaction. Cash Management Cash management services are a subset of the Deposit account fees revenue stream. These services primarily include ACH transaction processing, positive pay and remote deposit services. These services are also governed by separate agreements entered into with the customer. The fee arrangement for these services is structured to assess fees under one of two scenarios, either a per transaction fee arrangement or an earnings credit analysis arrangement. Under the per transaction fee arrangement, fixed fees are assessed concurrently with customers executing the transactions, and as such, the Company considers its performance obligations to be met concurrently with completing the requested transaction. Under the earnings credit analysis arrangement, the Company provides a monthly earnings credit to the customer that is negotiated and determined based on various factors. The credit is then available to absorb the per transaction fees that are assessed on the customer's deposit account activity for the month. Any amount of the transactional fees in excess of the earnings credit is recognized as revenue in that month. Interchange Fees The Company earns interchange revenue from its issuance of credit and debit cards granted through its membership in various card payment networks. The Company provides credit cards and debit cards to its customers which are authorized and settled through these payment networks, and in exchange, the Company earns revenue as determined by each payment network's interchange program. The revenue is recognized concurrently with the settlement of card transactions within each network. ATM Fees The Company deploys automated teller machines (ATMs) as part of its overall branch network. Certain transactions performed at the ATMs require customers to acknowledge and pay a fee for the requested service. Certain ATM fees are disclosed in the deposit account agreement fee schedules, whereas those assessed to non-Rockland Trust deposit holders are solely determined during the transaction at the machine. The ATM fee is a fixed dollar per transaction amount, and as such, is recognized concurrently with the overall daily processing and settlement of the ATM activity. Investment Management - Wealth Management and Advisory Services The Company offers investment management and trust services to individuals, institutions, small businesses and charitable institutions. Each investment management product is governed by its own contract along with a separate identifiable fee schedule unique to that product. The Company also offers additional services, such as estate settlement, financial planning, tax services and other special services quoted at the client's request. The asset management and/or custody fees are based upon a percentage of the monthly valuation of the principal assets in the customer's account, whereas fees for additional or special services are fixed in nature and are charged as services are rendered. As the fees are dependent on assets under management, which are susceptible to market factors outside of the Company's control, this variable consideration is constrained and therefore no revenue is estimated at contract initiation. As such, all revenue is recognized in correlation to the monthly management fee determinations or as transactional services are provided. Due to the fact that payments are primarily made subsequent to the valuation period, the Company records a receivable for revenue earned but not received. The following table provides the amount of investment management revenue earned but not received as of the periods indicated: December 31, 2018 December 31, 2017 (Dollars in thousands) Receivables, included in other assets $ 1,893 $ 1,934 Investment Management - Retail Investments and Insurance Revenue The Company offers the sale of mutual fund shares, unit investment trust shares, general securities, fixed and variable annuities and life insurance products through registered representatives who are both employed by the Company and licensed and contracted with various Broker General Agents to offer these products to the Company’s customer base. As such, the Company performs these services as an agent and earns a fixed commission on the sales of these products and services. To a lesser degree, production bonus commissions can also be earned based upon the Company meeting certain volume thresholds. In general, the Company recognizes commission revenue at the point of sale, and for certain insurance products, may also earn and recognize annual residual commissions commensurate with annual premiums being paid. Merchant Processing Income The Company refers customers to third party merchant processing partners in exchange for commission and fee income. The income earned is comprised of multiple components, including a fixed referral fee per each referred customer, a rebate amount determined primarily as a percentage of net revenue earned by the third party from services provided to each referred customer, and overall production bonus commissions if certain new account production thresholds are met. Merchant processing income is recognized in conjunction with either completing the referral to earn the fixed fee amount or as the merchant activity is processed to derive the Company's rebate and/or production bonus amounts. Other Noninterest Income The Company earns various types of other noninterest income that fall within the scope of the new revenue recognition rules, and have been aggregated into one general revenue stream in the table noted above. This amount includes, but is not limited to, the following types of revenue with customers: Safe Deposit Rent The Company rents out the use of safe deposit boxes to its customers, which can be accessed when the bank is open for business. The safe deposit box rental fee is paid upfront and is recognized as revenue ratably over the annual term of the contract. 1031 Exchange Fee Revenue The Company provides like-kind exchange services pursuant to Section 1031 of the Internal Revenue Code. Fee income is recognized in conjunction with completing the exchange transactions. Foreign Currency

OTHER COMPREHENSIVE LOSS

OTHER COMPREHENSIVE LOSS	12 Months Ended
	Dec. 31, 2018
Equity [Abstract]
OTHER COMPREHENSIVE LOSS	OTHER COMPREHENSIVE INCOME (LOSS) The following table presents a reconciliation of the changes in the components of other comprehensive income (loss) for the dates indicated, including the amount of income tax (expense) benefit allocated to each component of other comprehensive income (loss): December 31, 2018 Pre Tax Tax (Expense) After Tax (Dollars in thousands) Change in fair value of securities available for sale $ (5,923 ) $ 1,422 $ (4,501 ) Less: net security gains reclassified into other noninterest income (expense) — — — Net change in fair value of securities available for sale (5,923 ) 1,422 (4,501 ) Change in fair value of cash flow hedges 7,717 (2,169 ) 5,548 Less: net cash flow hedge gains reclassified into interest income or interest expense (1) 1,000 (281 ) 719 Net change in fair value of cash flow hedges 6,717 (1,888 ) 4,829 Net unamortized gain related to defined benefit pension and other postretirement adjustments arising during the period 1,521 (428 ) 1,093 Amortization of net actuarial losses 372 (105 ) 267 Amortization of net prior service cost 276 (78 ) 198 Net change in other comprehensive income for defined benefit postretirement plans (2) 2,169 (611 ) 1,558 Total other comprehensive income $ 2,963 $ (1,077 ) $ 1,886 Year Ended December 31, 2017 Pre Tax Tax (Expense) After Tax (Dollars in thousands) Change in fair value of securities available for sale $ (996 ) $ 321 $ (675 ) Less: net security gains reclassified into other noninterest income (expense) 3 (1 ) 2 Net change in fair value of securities available for sale (999 ) 322 (677 ) Change in fair value of cash flow hedges 307 (125 ) 182 Less: net cash flow hedge losses reclassified into interest income or interest expense (1) (441 ) 180 (261 ) Net change in fair value of cash flow hedges 748 (305 ) 443 Net unamortized loss related to defined benefit pension and other postretirement adjustments arising during the period (995 ) 407 (588 ) Amortization of net actuarial losses 278 (113 ) 165 Amortization of net prior service cost 276 (113 ) 163 Net change in other comprehensive income for defined benefit postretirement plans (2) (441 ) 181 (260 ) Total other comprehensive loss $ (692 ) $ 198 $ (494 ) Year Ended December 31, 2016 Pre Tax Tax (Expense) After Tax (Dollars in thousands) Change in fair value of securities available for sale $ (1,858 ) $ 710 $ (1,148 ) Less: net security losses reclassified into other noninterest income (expense) (26 ) 11 (15 ) Net change in fair value of securities available for sale (1,832 ) 699 (1,133 ) Change in fair value of cash flow hedges 1,133 (453 ) 680 Less: net cash flow hedge losses reclassified into interest income or interest expense (1) (2,520 ) 1,030 (1,490 ) Net change in fair value of cash flow hedges 3,653 (1,483 ) 2,170 Net unamortized loss related to defined benefit pension and other postretirement adjustments arising during the period (383 ) 157 (226 ) Amortization of net actuarial losses 238 (97 ) 141 Amortization of net prior service cost 276 (113 ) 163 Net change in other comprehensive income for defined benefit postretirement plans (2) 131 (53 ) 78 Total other comprehensive income $ 1,952 $ (837 ) $ 1,115 (1) Includes the amortization of the remaining balance of a realized but unrecognized gain, net of tax, from the termination of interest rate swaps in 2009. The original gain of $1.4 million , net of tax, was recognized in earnings through December 2018 , the original maturity date of the swap. The balance of this gain was fully amortized into earnings at December 31, 2018 . The balance of the gain was amortized to $137,000 , and $281,000 at December 31, 2017 and 2016 , respectively. (2) The amortization of prior service costs is included in the computation of net periodic pension costs as disclosed in Note 15 - Employee Benefit Plans . Effective January 1, 2018, the Company elected to reclassify certain tax effects from accumulated other comprehensive income to retained earnings, related to items that were stranded in other comprehensive income as a result of the Tax Act. A description of the other income tax effects that were reclassified as a result of the Tax Act are listed in the table below. Information on the Company's accumulated other comprehensive income (loss), net of tax, is comprised of the following components as of the periods indicated: Unrealized Gain (Loss) on Securities Unrealized Gain (Loss) on Cash Flow Hedge Deferred Gain on Hedge Transactions Defined Benefit Postretirement Plans Accumulated Other Comprehensive Income (Loss) (Dollars in Thousands) Beginning balance: January 1, 2016 $ 1,306 $ (1,955 ) $ 427 $ (2,230 ) $ (2,452 ) Other comprehensive income (loss) (1,133 ) 2,316 (146 ) 78 1,115 Ending balance: December 31, 2016 $ 173 $ 361 $ 281 $ (2,152 ) $ (1,337 ) Other comprehensive income (loss) (677 ) 587 (144 ) (260 ) (494 ) Ending balance: December 31, 2017 $ (504 ) $ 948 $ 137 $ (2,412 ) $ (1,831 ) Opening balance reclassification (111 ) 205 29 (520 ) (397 ) Cumulative effect accounting adjustment (831 ) — — — (831 ) Other comprehensive income (loss) (4,501 ) 4,995 (166 ) 1,558 1,886 Ending balance: December 31, 2018 $ (5,947 ) $ 6,148 $ — $ (1,374 ) $ (1,173 )

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES	12 Months Ended
	Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
COMMITMENTS AND CONTINGENCIES	COMMITMENTS AND CONTINGENCIES Financial Instruments with Off-Balance Sheet Risk In the normal course of business, the Company enters into various transactions to meet the financing needs of its customers, which, in accordance with GAAP, are not included in its consolidated balance sheets. These transactions include commitments to extend credit and standby letters of credit, which involve, to varying degrees, elements of credit risk and interest rate risk in excess of the amounts recognized in the consolidated balance sheets. The Company minimizes its exposure to loss under these commitments by subjecting them to credit approval and monitoring procedures. The Company enters into contractual commitments to extend credit, normally with fixed expiration dates or termination clauses, at specified rates and for specific purposes. Substantially all of these commitments to extend credit are contingent upon customers maintaining specific credit standards at the time of loan funding. Standby letters of credit are written conditional commitments issued to guarantee the performance of a customer to a third party. In the event the customer does not perform in accordance with the terms of the agreement with the third party, the Company would be required to fund the commitment. The maximum potential amount of future payments the Company could be required to make is represented by the contractual amount of the commitment. If the commitment were funded, the Company would be entitled to seek recovery from the customer. The Company’s policies generally require that standby letter of credit arrangements contain security and debt covenants similar to those contained in loan agreements. The fees collected in connection with the issuance of standby letters of credit are representative of the fair value of the obligation undertaken in issuing the guarantee. In accordance with applicable accounting standards related to guarantees, fees collected in connection with the issuance of standby letters of credit are deferred. The fees are then recognized in income proportionately over the life of the standby letter of credit agreement. The deferred standby letter of credit fees represent the fair value of the Company's potential obligations under the standby letter of credit guarantees. The following table summarizes the above financial instruments at the dates indicated: As of December 31 2018 2017 (Dollars in thousands) Commitments to extend credit $ 2,639,689 $ 2,443,478 Standby letters of credit $ 16,708 $ 15,534 Deferred standby letter of credit fees $ 122 $ 102 Lease Commitments The Company leases office space, space for ATM locations, and certain branch locations under noncancelable operating leases. Several of these leases have renewal options that typically range from 5 to 10 years. The following is a schedule of minimum future lease payments under such leases as of December 31, 2018 : (Dollars in thousands) 2019 $ 9,455 2020 9,125 2021 7,617 2022 6,610 2023 4,561 Thereafter 11,556 Total future minimum lease commitments $ 48,924 Rent expense incurred under operating leases was approximately $9.7 million , $8.6 million , and $8.5 million at December 31, 2018 , 2017 , and 2016 , respectively. Other Contingencies At December 31, 2018 , Rockland Trust was involved in pending lawsuits that arose in the ordinary course of business. Management has reviewed these pending lawsuits with legal counsel and has taken into consideration the view of counsel as to their outcome. In the opinion of management, the final disposition of pending lawsuits is not expected to have a material adverse effect on the Company’s financial position or results of operations. The Bank is required to maintain certain reserve requirements of vault cash and/or deposits with the Federal Reserve Bank of Boston. The amount of this reserve requirement was $53.5 million and $35.8 million at December 31, 2018 and 2017

REGULATORY CAPITAL REQUIREMENTS

REGULATORY CAPITAL REQUIREMENTS	12 Months Ended
	Dec. 31, 2018
Banking and Thrift [Abstract]
REGULATORY CAPITAL REQUIREMENTS	REGULATORY MATTERS Regulatory Capital Requirements The Company and the Bank are subject to various regulatory capital requirements administered by the federal banking agencies. Failure to meet minimum capital requirements can initiate certain mandatory and possibly additional discretionary actions by regulators that, if undertaken, could have a direct material effect on the Company’s financial statements. Under capital adequacy guidelines and the regulatory framework for prompt corrective action, the Company and the Bank must meet specific capital guidelines that involve quantitative measures of the Company’s and the Bank’s assets, liabilities and certain off-balance sheet items as calculated under regulatory accounting practices. The capital amounts and classification are also subject to qualitative judgments by the regulators about components, risk weightings and other factors. At December 31, 2018 the most recent notification from the Federal Deposit Insurance Corporation indicated that the Bank's capital levels met or exceeded the minimum levels to be considered "well capitalized" for bank regulatory purposes. To be categorized as well capitalized, an institution must maintain minimum total risk-based, Tier 1 risk-based, Common equity Tier 1 risk-based and Tier 1 leverage ratios as set forth in the following tables. There are no conditions or events since the notification that management believes have changed the Bank’s category. Management believes, as of December 31, 2018 and 2017 , that the Company and the Bank met all capital adequacy requirements to which they are subject. The Company’s and the Bank’s actual capital amounts and ratios as of December 31, 2018 and 2017 are also presented in the table that follows: Actual For Capital To Be Well Capitalized Amount Ratio Amount Ratio Amount Ratio December 31, 2018 (Dollars in thousands) Independent Bank Corp. Total capital (to risk weighted assets) $ 992,454 14.45 % $ 549,297 ≥ 8.0 % N/A N/A Common equity tier 1 capital (to risk weighted assets) $ 818,176 11.92 % $ 308,980 ≥ 4.5 % N/A N/A Tier 1 capital (to risk weighted assets) $ 892,176 12.99 % $ 411,973 ≥ 6.0 % N/A N/A Tier 1 capital (to average assets) $ 892,176 10.69 % $ 333,754 ≥ 4.0 % N/A N/A Rockland Trust Company Total capital (to risk weighted assets) $ 937,574 13.66 % $ 549,036 ≥ 8.0 % $ 686,295 ≥ 10.0 % Common equity tier 1 capital (to risk weighted assets) $ 872,024 12.71 % $ 308,833 ≥ 4.5 % $ 446,092 ≥ 6.5 % Tier 1 capital (to risk weighted assets) $ 872,024 12.71 % $ 411,777 ≥ 6.0 % $ 549,036 ≥ 8.0 % Tier 1 capital (to average assets) $ 872,024 10.46 % $ 333,595 ≥ 4.0 % $ 416,994 ≥ 5.0 % December 31, 2017 (Dollars in thousands) Independent Bank Corp. Total capital (to risk weighted assets) $ 886,807 13.82 % $ 513,398 ≥ 8.0 % N/A N/A Common equity tier 1 capital (to risk weighted assets) $ 718,995 11.20 % $ 288,787 ≥ 4.5 % N/A N/A Tier 1 capital (to risk weighted assets) $ 789,992 12.31 % $ 385,049 ≥ 6.0 % N/A N/A Tier 1 capital (to average assets) $ 789,992 10.04 % $ 314,756 ≥ 4.0 % N/A N/A Rockland Trust Company Total capital (to risk weighted assets) $ 846,147 13.19 % $ 513,175 ≥ 8.0 % $ 641,469 ≥ 10.0 % Common equity tier 1 capital (to risk weighted assets) $ 784,014 12.22 % $ 288,661 ≥ 4.5 % $ 416,955 ≥ 6.5 % Tier 1 capital (to risk weighted assets) $ 784,014 12.22 % $ 384,881 ≥ 6.0 % $ 513,175 ≥ 8.0 % Tier 1 capital (to average assets) $ 784,014 9.97 % $ 314,630 ≥ 4.0 % $ 393,288 ≥ 5.0 % In addition to the minimum risk-based capital requirements outlined in the table above, the Company is required to maintain a minimum capital conservation buffer, in the form of common equity, in order to avoid restrictions on capital distributions and discretionary bonuses. The required amount of the capital conservation buffer is 2.5%. The Company's capital levels exceeded the minimum requirement plus the buffer of 2.5% as of December 31, 2018 . Dividend Restrictions In the ordinary course of business, the Company is dependent upon dividends from the Bank to provide funds for the payment of dividends to shareholders and to provide for other cash requirements. Banking regulations may limit the amount of dividends that may be paid. Approval by regulatory authorities is required if the effect of dividends declared would cause the regulatory capital of the Bank to fall below specified minimum levels. Approval is also required if dividends declared exceed the net profits for that year combined with the retained net profits for the preceding two years. Under the foregoing dividend restrictions and while maintaining its "well capitalized" status, dividends paid by the Bank to the Company for the year ended December 31, 2018 and 2017 totaled $71.2 million and $46.9 million , respectively. Trust Preferred Securities In accordance with the applicable accounting standard related to variable interest entities, the common stock of trusts which have issued trust preferred securities have not been included in the consolidated financial statements. At December 31, 2018 and 2017 , there was $74.0 million and $71.0 million

PARENT COMPANY FINANCIALS ONLY

PARENT COMPANY FINANCIALS ONLY	12 Months Ended
	Dec. 31, 2018
Condensed Financial Information Disclosure [Abstract]
PARENT COMPANY FINANCIAL STATEMENTS	PARENT COMPANY FINANCIAL STATEMENTS Condensed financial information relative to the Parent Company’s balance sheets at December 31, 2018 and 2017 and the related statements of income and cash flows for the years ended December 31, 2018 , 2017 , and 2016 are presented below. The statement of stockholders’ equity is not presented below as the parent company’s stockholders’ equity is that of the consolidated Company. BALANCE SHEETS December 31 2018 2017 (Dollars in thousands) Assets Cash(1) $ 64,256 $ 48,131 Investments in subsidiaries(2) 1,128,407 1,010,125 Prepaid income taxes 1,014 786 Deferred tax asset — 96 Derivative instruments(1) 1,711 1,535 Other assets 37 — Total assets $ 1,195,425 $ 1,060,673 Liabilities and stockholders’ equity Dividends payable $ 10,671 $ 8,786 Junior subordinated debentures 76,173 73,073 Subordinated debentures 34,728 34,682 Other liabilities 363 323 Total liabilities 121,935 116,864 Stockholders’ equity 1,073,490 943,809 Total liabilities and stockholders’ equity $ 1,195,425 $ 1,060,673 (1) Entire balance eliminates in consolidation. (2) Majority of balance eliminates in consolidation. STATEMENTS OF INCOME Years Ended December 31 2018 2017 2016 (Dollars in thousands) Income Dividends received from subsidiaries(1) $ 71,255 $ 47,006 $ 44,598 Interest income(2) — 50 98 Total income 71,255 47,056 44,696 Expenses Interest expense 4,234 3,995 5,901 Total expenses 4,234 3,995 5,901 Income before income taxes and equity in undistributed income of subsidiaries 67,021 43,061 38,795 Income tax benefit (1,151 ) (1,523 ) (1,791 ) Income of parent company 68,172 44,584 40,586 Equity in undistributed income of subsidiaries 53,450 42,620 36,062 Net income $ 121,622 $ 87,204 $ 76,648 (1) Majority of balance eliminates in consolidation. (2) Entire balance eliminated in consolidation. STATEMENTS OF CASH FLOWS Years Ended December 31 2018 2017 2016 (Dollars in thousands) Cash flows from operating activities Net income $ 121,622 $ 87,204 $ 76,648 Adjustments to reconcile net income to cash provided by operating activities Amortization (accretion) 54 12 (154 ) Deferred income tax expense 49 51 678 Change in prepaid income taxes and other assets 135 (99 ) 423 Change in other liabilities 6 (562 ) (5,532 ) Equity in undistributed income of subsidiaries (53,450 ) (42,620 ) (36,062 ) Net cash provided by operating activities 68,416 43,986 36,001 Cash flows used in investing activities Cash paid for acquisitions, net of cash acquired (1) (13,649 ) (4,834 ) (950 ) Net cash used in investing activities (13,649 ) (4,834 ) (950 ) Cash flows used in financing activities Restricted stock awards issued, net of awards surrendered (1,371 ) (1,422 ) (696 ) Net proceeds from exercise of stock options 184 214 201 Proceeds from shares issued under the direct stock purchase plan 2,712 1,636 2,323 Common dividends paid (40,167 ) (34,045 ) (29,711 ) Net cash used in financing activities (38,642 ) (33,617 ) (27,883 ) Net increase in cash and cash equivalents 16,125 5,535 7,168 Cash and cash equivalents at the beginning of the year 48,131 42,596 35,428 Cash and cash equivalents at the end of the year $ 64,256 $ 48,131 $ 42,596 (1) The majority of the net assets acquired at the parent company represented each of the acquired companies' investments in their wholly owned subsidiaries, which were eliminated in consolidation at December 31, 2018 , 2017 , and 2016

SELECTED QUARTERLY FINANCIAL DA

SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED)	12 Months Ended
	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED)	SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) First Quarter Second Quarter Third Quarter Fourth Quarter 2018 2017 2018 2017 2018 2017 2018 2017 (Dollars in thousands, except per share data) Interest income $ 73,749 $ 64,407 $ 79,167 $ 68,133 $ 82,875 $ 71,778 $ 87,910 $ 72,876 Interest expense 5,278 4,207 5,999 4,378 6,641 4,705 7,618 5,044 Net interest income 68,471 60,200 73,168 63,755 76,234 67,073 80,292 67,832 Provision for loan losses 500 600 2,000 1,050 1,075 — 1,200 1,300 Total noninterest income 19,863 18,912 21,887 21,398 23,264 20,770 23,491 21,914 Total noninterest expenses 53,451 48,773 52,688 52,809 55,439 51,310 64,391 51,467 Provision for income taxes 6,828 9,014 9,249 10,731 9,969 12,681 8,258 14,915 Net income $ 27,555 $ 20,725 $ 31,118 $ 20,563 $ 33,015 $ 23,852 $ 29,934 $ 22,064 Basic earnings per share $ 1.00 $ 0.77 $ 1.13 $ 0.75 $ 1.20 $ 0.87 $ 1.08 $ 0.80 Diluted earnings per share $ 1.00 $ 0.76 $ 1.13 $ 0.75 $ 1.20 $ 0.87 $ 1.07 $ 0.80 Weighted average common shares (basic) 27,486,573 27,029,640 27,526,653 27,257,799 27,537,841 27,436,792 27,815,437 27,445,739 Common stock equivalents 67,381 81,283 54,525 74,497 63,499 76,307 58,576 77,615 Weighted average common shares (diluted) 27,553,954 27,110,923 27,581,178 27,332,296 27,601,340 27,513,099 27,874,013 27,523,354 Unusual or infrequently occurring items Items within noninterest expense Merger and acquisition expense $ — $ 484 $ 434 $ 2,909 $ 2,688 $ — $ 8,046 $ — Items within provision for income taxes 2017 Tax Act: revaluation of net deferred tax assets $ — $ — $ — $ — $ — $ — $ — $ 1,895 2017 Tax Act: revaluation of LIHTC investments $ — $ — $ — $ — $ — $ — $ — $ 466 Total unusual or infrequently occurring items $ — $ 484 $ 434 $ 2,909 $ 2,688 $ — $ 8,046 $ 2,361

TRANSACTIONS WITH RELATED PARTI

TRANSACTIONS WITH RELATED PARTIES (Notes)	12 Months Ended
	Dec. 31, 2018
Related Party Transactions [Abstract]
Related Party Transactions Disclosure [Text Block]	TRANSACTIONS WITH RELATED PARTIES Certain directors and officers (including their affiliates, certain family members and entities in which they are principal owners) of the Company are customers of and have had, and are expected to have, transactions with the Company, within the ordinary course of business. These transactions include, but are not limited to, lending activities, deposit services, investment management, and property lease commitments. In the opinion of management, such transactions are consistent with prudent banking practices and are within applicable banking regulations. Further details relating to certain related party transactions are outlined below: Lending Activities The following information represents annual activity of loans to related parties for the periods indicated: 2018 2017 (Dollars in thousands) Principal balance of loans outstanding at beginning of year $ 52,458 $ 22,795 Loan advances (1) 14,862 36,800 Loan payments/payoffs (14,057 ) (7,137 ) Reduction for retired directors (12,093 ) — Principal balance of loans outstanding at end of year $ 41,170 $ 52,458 1. The 2017 amount includes $31.3 million of loans associated with a newly appointed director during the year, which represent the outstanding loan balances at the effective date of appointment. At December 31, 2018 and 2017 , there were no loans to related parties which were past due, on nonaccrual status or that had been restructured as part of a troubled debt restructuring. Deposits At December 31, 2018 and 2017 , the amount of deposit balances of related parties totaled $10.8 million and $18.3 million , respectively. Lease Commitments There were no leases with related parties during the years ended December 31, 2018 , 2017 and 2016

SUMMARY OF SIGNIFICANT ACCOUN_2

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	12 Months Ended
	Dec. 31, 2018
Accounting Policies [Abstract]
PRINCIPLES OF CONSOLIDATION	The consolidated financial statements include the accounts of the Company, the Bank and other wholly-owned subsidiaries, except subsidiaries that are not deemed necessary to be consolidated. All significant intercompany balances and transactions have been eliminated in consolidation. The Company determines whether it has a controlling financial interest in an entity by first evaluating whether the entity is a voting interest entity or a variable interest entity under GAAP. Voting interest entities are entities in which the total equity investment at risk is sufficient to enable the entity to finance itself independently and provides the equity holders with the obligation to absorb losses, the right to receive residual returns and the right to make decisions about the entity’s activities. The Company would consolidate voting interest entities in which it has all, or at least a majority of, the voting interest. As defined in applicable accounting standards, variable interest entities (“VIEs”) are entities that lack one or more of the characteristics of a voting interest entity. A controlling financial interest in a VIE is present when the Company has both the power and ability to direct the activities of the VIE that most significantly impact the VIE's economic performance and an obligation to absorb losses or the right to receive benefits that could potentially be significant to the VIE. The Company also owns the common stock of various trusts which have issued trust preferred securities. These trusts are VIEs in which the Company is not the primary beneficiary and, therefore, are not consolidated. The trust's only assets are junior subordinated debentures issued by the Company, which were acquired by the trust using the proceeds from the issuance of the trust preferred securities and common stock. The junior subordinated debentures are included in long-term debt and the Company’s equity interest in the trust is included in other assets in the accompanying Consolidated Balance Sheets. Interest expense on the junior subordinated debentures is reported in interest expense on long-term debt in the accompanying Consolidated Statements of Income.
RECLASSIFICATION	ReclassificationCertain previously reported amounts have been reclassified to conform to the current year’s presentation.
USE OF ESTIMATES	Use of EstimatesThe preparation of financial statements in conformity with accounting principles generally accepted in the United States of America ("GAAP") requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting periods. Actual results could vary from these estimates. Material estimates that are particularly susceptible to significant changes in the near-term relate to the determination of the allowance for loan losses, income taxes, valuation and potential impairment of investment securities, other-than-temporary impairment (“OTTI”) of certain investment securities, as well as valuation of goodwill and other intangibles and their respective analyses of impairment.
SIGNIFICANT CONCENTRATIONS OF CREDIT RISK	Significant Concentrations of Credit Risk The vast majority of the Bank’s lending activities are conducted in the Commonwealth of Massachusetts and Rhode Island. The Bank originates commercial and industrial loans, commercial and residential real estate loans, including construction loans, small business loans, home equity loans, and other consumer loans for its portfolio. The Bank considers a concentration of credit to a particular industry to exist when the aggregate credit exposure which includes direct, indirect or contingent obligations to a borrower, an affiliated group of borrowers or a nonaffiliated group of borrowers engaged in one industry, exceeds 10% of the Bank’s loan portfolio. Loans originated by the Bank to lessors of nonresidential buildings represented 15.1% and 15.4% of the total loan portfolio at December 31, 2018 and 2017
CASH AND CASH EQUIVALENTS	Cash and Cash Equivalents For purposes of reporting cash flows, cash and cash equivalents may include cash on hand, amounts due from banks, inclusive of interest-earning deposits held at banks, and federal funds sold. Generally, federal funds are sold for up to two week periods.
SECURITIES	Investment securities are classified at the time of purchase as “available for sale,” “held to maturity,” “trading,” or "equity." Classification is constantly re-evaluated for consistency with corporate goals and objectives. Trading and equity securities are recorded at fair value with subsequent changes in fair value recorded in earnings. Debt securities that management has the positive intent and ability to hold to maturity are classified as “held to maturity” and recorded at amortized cost. Securities not classified as held to maturity, trading or equity, are classified as “available for sale” and recorded at fair value, with changes in fair value excluded from earnings and reported in other comprehensive income, net of related tax. Purchase premiums and discounts are recognized in interest income, using the interest method, to arrive at periodic interest income at a constant effective yield, thereby reflecting the securities market yield. Gains and losses on the sale of securities are recorded on the trade date and are determined using the specific identification method.
LOANS HELD FOR SALE	Loans Held for Sale The Bank primarily classifies new residential real estate mortgage loans as held for sale based on intent, which is determined when loans are underwritten. Residential real estate mortgage loans not designated as held for sale are retained based upon available liquidity, for interest rate risk management and other business purposes.
LOANS	Loans Loans are carried at the principal amounts outstanding, or amortized acquired fair value in the case of acquired loans, adjusted by partial charge-offs and net of deferred loan costs or fees. For originated loans, loan fees and certain direct origination costs are deferred and amortized into interest income over the expected term of the loan using the level-yield method. When a loan is paid off, the unamortized portion is recognized in interest income. Interest income on loans is accrued based upon the daily principal amount outstanding except for loans on nonaccrual status. For acquired loans which did not show signs of credit deterioration at acquisition, interest income is also accrued based upon the daily principal amount outstanding and is then further adjusted by the accretion of any discount or amortization of any premium associated with the loan. As a general rule, loans more than 90 days past due with respect to principal or interest are classified as nonaccrual loans, or sooner if management considers such action to be prudent. However, loans that are more than 90 days past due may be kept on an accruing status if the loan is well secured and in the process of collection. The Company may also put a junior lien mortgage on nonaccrual status as a result of delinquency with respect to the first position, which is held by the Bank or by another financial institution, while the junior lien is currently performing. Income accruals are suspended on all nonaccrual loans and all previously accrued and uncollected interest is reversed against current income. A loan remains on nonaccrual status until it becomes current with respect to principal and interest (and in certain instances remains current for up to six months), the loan is liquidated, or when the loan is determined to be uncollectible and is charged-off against the allowance for loan losses. When doubt exists as to the collectability of a loan, any payments received are applied to reduce the recorded investment in the asset to the extent necessary to eliminate such doubt. For all loan portfolios, a charge-off occurs when the Company determines that a specific loan, or portion thereof, is uncollectible. This determination is made based on management's review of specific facts and circumstances of the individual loan, including assessing the viability of the customer’s business or project as a going concern, the expected cash flows to repay the loan, the value of the collateral and the ability and willingness of any guarantors to perform.
ACQUIRED LOANS	Acquired loans All acquired loans are recorded at fair value with no carryover of the allowance for loan losses. At acquisition, loans are also reviewed to determine if the loan has evidence of deterioration in credit quality and to review if it is probable, at acquisition, that all contractually required payments will not be collected. Such loans are deemed to be purchased credit impaired ("PCI") loans. Under the accounting model for PCI loans, the excess of cash flows expected to be collected over the carrying amount of the loans, referred to as the "accretable yield", is accreted into interest income over the life of the loans using the effective yield method. Accordingly, PCI loans are not subject to classification as nonaccrual in the same manner as originated loans. Rather, acquired loans are generally considered to be accruing loans because their interest income relates to the accretable yield recognized and not to contractual interest payments at the loan level. The difference between contractually required principal and interest payments and the cash flows expected to be collected, referred to as the "nonaccretable difference", includes estimates of both the impact of prepayments and future credit losses expected to be incurred over the life of the loans. The estimate of cash flows expected to be collected is regularly re-assessed subsequent to acquisition. These re-assessments involve updates, as necessary, of the key assumptions and estimates used in the initial estimate of fair value. Generally speaking, expected cash flows are affected by: • Changes in the expected principal and interest payments over the estimated life - Changes in expected cash flows may be driven by the credit outlook and actions taken with borrowers. Changes in expected future cash flows resulting from loan modifications are included in the assessment of expected cash flows. • Change in prepayment assumptions - Prepayments affect the estimated life of the loans, which may change the amount of interest income expected to be collected. • Change in interest rate indices for variable rate loans - Expected future cash flows are based, as applicable, on the variable rates in effect at the time of the assessment of expected cash flows. A decrease in expected cash flows in subsequent periods may indicate that the loan is impaired which would likely require the recognition of a charge-off against the allowance for loan losses or an establishment of a specific reserve. An increase in expected cash flows in subsequent periods serves, first, to reduce any previously established specific reserve by the increase in the present value of cash flows expected to be collected. Any increase above the previously established specific reserve results in a recalculation of the amount of accretable yield for the loan. The adjustment of accretable yield due to an increase in expected cash flows is accounted for as a change in estimate. The additional cash flows expected to be collected are reclassified from the nonaccretable difference to the accretable yield, and the amount of periodic accretion is adjusted accordingly over the remaining life of the loans. A PCI loan may be resolved either through receipt of payment (in full or in part) from the borrower, the sale of the loan to a third party, or foreclosure of the collateral. In the event of a sale of the loan, a gain or loss on sale would be recognized and reported within noninterest income based on the difference between the sales proceeds and the carrying amount of the loan. For PCI loans accounted for on an individual loan basis and resolved directly with the borrower, any amount received from resolution in excess of the carrying amount of the loan is recognized and reported within interest income.
ALLOWANCE FOR LOAN LOSSES	Allowance for Loan Losses The allowance for loan losses is established based upon the level of estimated probable losses in the current loan portfolio. Loan losses are charged against the allowance when management believes the collectability of a loan balance is doubtful. Subsequent recoveries, if any, are credited to the allowance. The allowance for loan losses is allocated to loan types using both a formula-based approach applied to groups of loans and an analysis of certain individual loans for impairment. The formula-based approach emphasizes loss factors derived from actual historical portfolio loss rates, which are combined with an assessment of certain qualitative factors to determine the allowance amounts allocated to the various loan categories. Allowance amounts are determined based on an estimate of the historical average annual percentage rate of loan loss for each loan category, an estimate of the incurred loss emergence and confirmation period for each loan category, and certain qualitative risk factors considered in the computation of the allowance for loan losses. The qualitative risk factors impacting the inherent risk of loss within the portfolio include the following: • National and local economic and business conditions • Level and trend of delinquencies • Level and trend of charge-offs and recoveries • Trends in volume and terms of loans • Risk selection, lending policy and underwriting standards • Experience and depth of management • Banking industry conditions and other external factors • Concentration risk The formula-based approach evaluates groups of loans with common characteristics, which consist of similar loan types with similar terms and conditions, to determine the appropriate allocation within each portfolio section. This approach incorporates qualitative adjustments based upon management’s assessment of various market and portfolio specific risk factors into its formula-based estimate. Due to the imprecise nature of the loan loss estimation process and ever changing conditions, the qualitative risk attributes may not adequately capture amounts of incurred loss in the formula-based loan loss components used to determine the Bank’s analysis of the appropriateness of the allowance for loan losses. The Bank evaluates certain loans within the commercial and industrial, commercial real estate, commercial construction and small business portfolios individually for specific impairment. A loan is considered impaired when, based on current information and events, it is probable that the Bank will be unable to collect the scheduled payments of principal or interest when due according to the contractual terms of the loan agreement. Factors considered by management in determining impairment include payment status, collateral value, contractual interest rates and the probability of collecting scheduled principal and interest payments when due. Loans that experience insignificant payment delays and payment shortfalls generally are not classified as impaired. Loans are selected for evaluation based upon a change in internal risk rating, occurrence of delinquency, loan classification, troubled debt restructuring or nonaccrual status. A specific allowance amount is allocated to an individual loan when such loan has been deemed impaired and when the amount of the probable loss is able to be estimated. Estimates of loss may be determined by the present value of anticipated future cash flows, the loan’s observable fair market value, or the fair value of the collateral, if the loan is collateral dependent. However, for collateral dependent loans, the amount of the recorded investment in a loan that exceeds the fair value of the collateral less costs to sell is charged-off against the allowance for loan losses in lieu of an allocation of a specific allowance amount when such an amount has been identified definitively as uncollectible. Large groups of small-balance homogeneous loans such as the residential real estate, residential construction, home equity and other consumer portfolios are collectively evaluated for impairment. As such, the Bank does not typically identify individual loans within these groupings as impaired loans for impairment evaluation and disclosure. However, the Bank evaluates all TDRs for impairment on an individual loan basis regardless of loan type. In the ordinary course of business, the Bank enters into commitments to extend credit, commercial letters of credit, and standby letters of credit. Such financial instruments are recorded in the financial statements when they become payable. The credit risk associated with these commitments is evaluated in a manner similar to the allowance for loan losses. The reserve for unfunded lending commitments is included in other liabilities in the balance sheet. At December 31, 2018 and 2017 , the reserve for unfunded loan commitments was $1.3 million and $972,000
Transfers and Servicing of Financial Assets, Transfers of Financial Assets, Financings, Policy [Policy Text Block]	Transfers and Servicing of Financial Assets Transfers of financial assets are accounted for as sales when control over the assets has been surrendered. Control over transferred assets is deemed to be surrendered when (1) the assets have been isolated from the Company, (2) the transferee obtains the right (free of conditions that constrain it from taking advantage of that right) to pledge or exchange the transferred assets, and (3) the Company does not maintain effective control over the transferred assets through an agreement to repurchase them before their maturity. Loans held for sale are generally sold with servicing rights released, however if rights are retained, servicing assets are recognized as separate assets. Servicing rights are originally recorded at fair value within other assets, but subsequently are amortized in proportion to and over the period of estimated net servicing income, and are assessed for impairment at each reporting date. Fair value is based on market prices for comparable mortgage servicing contracts, when available, or alternatively, is based on a valuation model that calculates the present value of estimated future net servicing income. The valuation model incorporates assumptions that market participants would use in estimating future net servicing income, such as the cost to service, the discount rate, the custodial earnings rate, an inflation rate, ancillary income, prepayment speeds, default rates and losses. Impairment is determined by stratifying the rights based on predominant characteristics, such as interest rate, loan type and investor type. Impairment is recognized through a valuation allowance, to the extent that fair value is less than the capitalized amount. If the Company later determines that all or a portion of the impairment no longer exists, a reduction of the allowance may be recorded as an increase to income.
FEDERAL HOME LOAN BANK STOCK	Federal Home Loan Bank StockThe Company, as a member of the Federal Home Loan Bank (“FHLB”) of Boston, is required to maintain an investment in capital stock of the FHLB. Based on redemption provisions, the stock has no quoted market value and is carried at cost. The Company continually reviews its investment to determine if OTTI exists. The Company reviews recent public filings, rating agency analysis and other factors when making its determination.
BANK PREMISES AND EQUIPMENT	Bank Premises and Equipment Land is carried at cost. Bank premises and equipment are stated at cost less accumulated depreciation. Depreciation is computed using the straight-line convention method over the estimated useful lives of the assets. Leasehold improvements are amortized over the shorter of the lease terms or the estimated useful lives of the improvements. Expected terms include lease option periods to the extent that the exercise of such options is reasonably assured, not to exceed fifteen years
GOODWILL AND IDENTIABLE INTANGIBLE ASSETS	Goodwill and Other Intangible Assets Goodwill represents the excess of the purchase price over the net fair value of acquired businesses. Goodwill is not amortized and is assigned to one reporting unit. Goodwill is evaluated for impairment at least annually, or more often if warranted, using a combined qualitative and quantitative impairment approach. The initial qualitative approach assesses whether the existence of events or circumstances led to a determination that it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If, after assessing the totality of events and circumstances, the Company determines it is more likely than not that the fair value is less than carrying value, the two step quantitative impairment test is performed. Step one of the quantitative impairment test compares book value to the fair value of the reporting unit. If step one is failed, a detailed step two analysis is performed, which involves measuring the excess of the fair value of the reporting unit, as determined in step one, over the aggregate fair value of the individual assets, liabilities, and identifiable intangibles as if the reporting unit was being acquired in a business combination. Other intangible assets subject to amortization consist of core deposit intangibles, noncompete agreements, customer lists and market-based favorable or unfavorable lease positions at time of acquisition, and are amortized over the estimated lives of the intangibles using a method that approximates the amount of economic benefits that are realized by the Company. Other intangible assets are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of the assets may not be recoverable. The range of useful lives is as follows: Core deposit intangibles 10 years Noncompete agreements 1-3 years Customer Lists 12 years Leases 3-30 years
IMPAIRMENT OF LONG-LIVED ASSETS OTHER THAN GOODWILL	Impairment of Long-Lived Assets Other Than GoodwillThe Company reviews long-lived assets, including premises and equipment, for impairment whenever events or changes in business circumstances indicate that the remaining useful life may warrant revision or that the carrying amount of the long-lived asset may not be fully recoverable. The Company performs undiscounted cash flow analysis to determine if impairment exists. If impairment is determined to exist, any related impairment loss is calculated based on fair value. Impairment losses on assets to be disposed of, if any, are based on the estimated proceeds to be received, less costs of disposal.
CASH SURRENDER VALUE OF LIFE INSURANCE POLICIES	Cash Surrender Value of Life Insurance Policies Increases in the cash surrender value (“CSV”) of life insurance policies, as well as benefits received net of any CSV, are recorded in other noninterest income, and are generally not subject to income taxes. The CSV of the policies is recorded as an asset of the Bank, with liabilities recognized for any split dollar arrangements associated with the policies. The Company reviews the financial strength of the insurance carriers prior to the purchase of life insurance policies and no less than annually thereafter. Regulatory requirements limit the total amount of CSV to be held with any individual carrier to 15% of Tier 1 capital (as defined for regulatory purposes) and the total CSV of all life insurance policies is limited to 25%
OTHER REAL ESTATE OWNED AND OTHER FORECLOSED ASSETS	and Other Foreclosed Assets
Repurchase and Resale Agreements Policy [Policy Text Block]	Customer Repurchase Agreements
DERIVATIVES	Derivatives Derivative instruments are carried at fair value in the Company’s financial statements. The accounting for changes in the fair value of a derivative instrument is determined by whether it has been designated and qualifies as part of a hedging relationship, and further, by the type of hedging relationship. At the inception of a hedge, the Company documents certain items, including but not limited to the following: the relationship between hedging instruments and hedged items, the Company's risk management objectives, hedging strategies, and the evaluation of hedge transaction effectiveness. Documentation includes linking all derivatives designated as fair value or cash flow hedges to specific assets and liabilities on the balance sheet or to specific forecasted transactions. For those derivative instruments that are designated and qualify for special hedge accounting, the Company designates the hedging instrument, based upon the exposure being hedged, as either a fair value hedge or a cash flow hedge. For derivative instruments that are designated and qualify as a cash flow hedge (i.e., hedging the exposure to variability in expected future cash flows that is attributable to a particular risk), the effective portion of the gain or loss on the derivative instrument is reported as a component of other comprehensive income, net of related tax. The Company considers any economic mismatch between the hedging instrument and the hedged transaction in its ongoing assessment of hedge effectiveness. If the hedging instrument is not highly effective at achieving offsetting cash flows attributable to the revised contractually specified interest rate(s), hedge accounting will be discontinued. At that time, accumulated other comprehensive income would be frozen and amortized, as long as the forecasted transactions are still probable of occurring. For derivative instruments designated and qualifying as a fair value hedge (i.e., hedging the exposure to changes in the fair value of an asset or liability or an identified portion thereof that is attributable to the hedged risk), the gain or loss on the derivative instrument, as well as the offsetting gain or loss on the hedged item attributable to the hedged risk, are recognized in current earnings during the period of the change in fair values. Hedge accounting is discontinued prospectively when (1) a derivative is no longer highly effective in offsetting changes in the fair value or cash flow of a hedged item, (2) a derivative expires or is settled, (3) it is no longer likely that a forecasted transaction associated with the hedge will occur, or (4) it is determined that designation of a derivative as a hedge is no longer appropriate. To the extent the Company enters into new or re-designates existing hedging relationships, it is the Company's policy to include the Overnight Index Swap Rate in the spectrum of available benchmark interest rates for hedge accounting.
RETIREMENT PLANS	Retirement Plans The Company has various retirement plans in place for current and former employees, including postretirement benefit plans, supplemental executive retirement plans, frozen multiemployer pension plans, deferred compensation plans, as well as other benefits. The postretirement benefit plans and the supplemental executive retirement plans are unfunded and therefore have no plan assets. The actuarial cost method used to compute the benefit liabilities and related expense is the projected unit credit method. The projected benefit obligation is principally determined based on the present value of the projected benefit distributions at an assumed discount rate. The discount rate which is utilized is based on the investment yield of high quality corporate bonds available in the market place with maturities approximately equal to projected cash flows of future benefit payments as of the measurement date. Periodic benefit expense (or income) includes service costs and interest costs based on the assumed discount rate, amortization of prior service costs due to plan amendments and amortization of actuarial gains and losses. Service costs are included in salaries and employee benefits and all other costs are included in other noninterest expense. The amortization of actuarial gains and losses is determined using the 10% corridor minimum amortization approach and is taken over the average remaining future working lifetime of the plan participants. The underfunded status of the plans is recorded as a liability on the balance sheet. The multiemployer pension plans' assets are determined based on fair value, generally representing observable market prices. The actuarial cost method used to compute the pension liabilities and related expense is the unit credit method. The pension expense is equal to the plan contribution requirement of the Company for the plan year. The Director Deferred Compensation and 401(k) Restoration plans allow directors and employees to invest their funds within a rabbi trust, including both Company stock and other investment alternatives offered by the plan. The plans do not permit diversification after initial election and therefore elections made to defer into Company stock result in both the investment and obligation recognized within Stockholders' Equity. Alternatively, investments not in Company stock are included in Securities-trading, with the correlating obligation classified as a liability.
STOCK-BASED COMPENSATION	Stock-Based CompensationThe Company recognizes stock-based compensation based on the grant-date fair value of the award, with no adjustment for estimated forfeitures, as forfeitures are recognized when they occur. For restricted stock awards and units, the Company recognizes compensation expense ratably over the vesting period for the fair value of the award, measured at the grant date. For stock option awards, the Company values awards granted using the Black-Scholes option-pricing model. The Company recognizes compensation expense for these awards on a straight-line basis over the requisite service period for the entire award (straight-line attribution method), ensuring that the amount of compensation cost recognized at any date at least equals the portion of the grant-date fair value of the award that is vested at that time.
INCOME TAXES	Income Taxes Deferred income tax assets and liabilities are determined using the asset and liability (or balance sheet) method of accounting for income taxes. Under this method, deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. If current available information raises doubt as to the realization of the deferred tax assets, a valuation allowance is established. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in enacted tax rates is recognized in income in the period that includes the enactment date. Income taxes are allocated to each entity in the consolidated group based on its share of taxable income. Management exercises significant judgment in evaluating the amount and timing of recognition of the resulting tax liabilities and assets, including projections of future taxable income. Additionally, a liability for unrecognized tax benefits is recorded for uncertain tax positions taken by the Company on its tax returns for which there is less than a 50% likelihood of being recognized upon a tax examination.
Low Income Housing Tax Credits Policy Text Block [Policy Text Block]	Low Income Housing Tax Credits
ASSETS UNDER ADMININSTRATION	Assets Under AdministrationAssets held in a fiduciary or agency capacity for customers are not included in the accompanying consolidated balance sheet, as such assets are not assets of the Company. Revenue from administrative and management activities associated with these assets is recorded on an accrual basis.
Extinguishment of Debt [Policy Text Block]	Extinguishment of DebtUpon extinguishment of an outstanding debt, the Company records the difference between the exit price and the net carrying amount of the debt as a gain or loss on the extinguishment. The gain or loss is recorded as a component of other noninterest income or other noninterest expense, respectively.
EARNINGS PER SHARE	Earnings Per ShareBasic earnings per share is calculated using the two-class method. The two-class method is an earnings allocation formula under which earnings per share is calculated from common stock and participating securities according to dividends declared and participation rights in undistributed earnings. Under this method, all earnings distributed and undistributed, are allocated to participating securities and common shares based on their respective rights to receive dividends. Unvested share-based payment awards that contain nonforfeitable rights to dividends are considered participating securities, not subject to performance based measures (i.e. unvested time-vested restricted stock). Basic earnings per share is calculated by dividing net income by the weighted average number of common shares outstanding (inclusive of participating securities). Diluted earnings per share have been calculated in a manner similar to that of basic earnings per share except that the weighted average number of common shares outstanding is increased to include the number of additional common shares that would have been outstanding if all potentially dilutive common shares (such as those resulting from the exercise of stock options or the attainment of performance measures) were issued during the period, computed using the treasury stock method.
COMPREHENSIVE INCOME	Comprehensive IncomeComprehensive income consists of net income and other comprehensive income. Other comprehensive income includes unrealized gains and losses on securities available for sale, unrealized losses related to factors other than credit on debt securities, if applicable, unrealized gains and losses on cash flow hedges, deferred gains on hedge accounting transactions, and changes in the funded status of the Company’s postretirement and supplemental retirement plans.
FAIR VALUE MEASUREMENTS	Fair Value MeasurementsIn general, fair values of financial instruments are based upon quoted market prices, where available. If such quoted market prices are not available, fair value is based upon developed models that primarily use, as inputs, observable market-based parameters. Valuation adjustments may be made to ensure that financial instruments are recorded at fair value. These adjustments may include amounts to reflect counterparty credit quality and the Company’s creditworthiness, among other things, as well as unobservable parameters.
New Accounting Pronouncements, Policy [Policy Text Block]	Recent Accounting Standards Financial Accounting Standards Board ("FASB") Accounting Standards Codification ("ASC") Topic 326 "Financial Instruments - Credit Losses" Update No. 2016-13. Update No. 2016-13 was issued in June 2016 to provide financial statement users with more decision-useful information about the expected credit losses on financial instruments and other commitments to extend credit held by a reporting entity at each reporting date. To achieve this objective, this update replaces the incurred loss impairment methodology in current GAAP with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to inform credit loss estimates. The amendments affect loans, debt securities, trade receivables, net investments in leases, off-balance sheet credit exposures, reinsurance receivables, and any other financial assets not excluded from the scope that have the contractual right to receive cash. The Company will adopt the update on January 1, 2020 and is currently assessing the impact of the adoption of this standard on the Company's consolidated financial position. To date, the Company has been assessing the key differences and gaps between its current allowance methodologies and models with those it is considering to use upon adoption. This has included assessing the adequacy of existing loss data, developing models for default and loss estimates, and finalizing vendor selection. The Company has also begun developing accounting policies as well as considering the need for new internal controls relevant to the updated methodologies and models. The Company expects to validate its models and execute a parallel run beginning in early 2019. Since the Update No. 2016-13, the FASB has issued an amendment intended on improving the clarification of the amendment, FASB ASC Topic 326 "Financial Instruments - Credit Losses" Update No. 2018-19. The amendments in Update No. 2018-19 was issued in November 2018 and was intended to clarify that receivables arising from operating leases are not within the scope of Subtopic 326-20. Instead, impairment of receivables arising from operating leases should be accounted for in accordance with Topic 842, Leases. FASB ASC Topic 842 "Leases" Update No. 2016-02. Update No. 2016-02 was issued in February 2016 and affects any entity that enters into a lease (as that term is defined in this update), with some specified scope exemptions. The core principle of this update is that a lessee should recognize in the statement of financial position a liability to make lease payments and a right-of-use ("ROU") asset representing its right to use the underlying asset for the lease term. For leases with a term of 12 months or less, a lessee is permitted to make an accounting policy election by class of underlying asset not to recognize lease assets and lease liabilities. The recognition, measurement, and presentation of expenses and cash flows arising from a lease have not significantly changed from previous GAAP. In addition, the accounting applied by a lessor is largely unchanged from that applied under previous GAAP. Since the issuance of Update 2016-02, the FASB has issued codification improvements to the standard in FASB ASC Topic 842 "Leases" Update No. 2018-10 and FASB ASC Topic 842 "Leases" Update No. 2018-11. The amendments in Update 2018-10 affect narrow aspects of the guidance issued in the amendments in Update 2016-02 and provide improvements or clarification to the previously issued update. The amendments in update 2018-11 are related to the transition relief on comparative reporting at adoption, which allows entities to initially apply the new leases standard at the adoption date and recognize a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. This update applies to all entities with lease contracts that choose the additional transition method. For public companies, the amendments in these updates are effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. Additionally, FASB ASC Topic 842 "Leases" Update No. 2018-20 provided narrow-scope improvements for lessors, which was issued to increase transparency and comparability among organizations. The Company adopted all of the Lease related Updates effective January 1, 2019 and used the effective date as the date of initial application, and therefore, periods prior to January 1, 2019 will not be restated. The Company elected the package of practical expedients, which permits the Company not to reassess prior conclusions about lease identifications, lease classification and initial direct costs under the new standard. The Company did not elect to apply the hindsight practical expedient pertaining to using hindsight knowledge as of the effective date when determining lease terms and impairment. As noted above, the new standard also provides practical expedients for an entity's ongoing accounting. The Company has elected the short-term lease recognition exemption for all leases that qualify, and thus will not recognize ROU assets or lease liabilities for those leases. The adoption of these standards resulted in the recognition of new ROU assets and lease liabilities on its balance sheet for its real estate operating leases as of January 1, 2019, and requires significant new disclosures about its leasing activities prospectively. Upon adoption, the Company recognized on its balance sheet ROU assets of approximately $32.8 million, with a corresponding operating lease liability of approximately $34.1 million, with an adjustment to remove the Company's existing deferred rent liability of approximately $1.3 million. These amounts were based on the present value of the remaining minimum rental payments under current leasing standards for existing operating leases. FASB ASC Topic 815 "Derivatives and Hedging" Update No. 2018-16. Update No. 2018-16 was issued in October 2018. The amendments in this update permit the Overnight Index Swap (OIS) rate based on Secured Overnight Financing Rate (SOFR) as a U.S. benchmark interest rate for hedge accounting purposes under Topic 815 in addition to the Treasury obligations of the U.S. government (UST), the London Interbank Offered Rate (LIBOR) swap rate, the OIS rate based on the Fed Funds Effective Rate, and the Securities Industry and Financial markets Association (SIFMA) Municipal Swap Rate. The amendments are effective for fiscal years beginning after December 15, 2018 and interim periods within those fiscal years. The amendments should be adopted on a prospective basis for qualifying new or redesignated hedging relationships entered into on or after the date of adoption. The Company is in the process of assessing the impact of this standard in conjunction with its efforts to review and address its loans that currently priced off LIBOR indexes and are tied to existing interest rate hedges. FASB ASC Subtopic 715-20 "Compensation - Retirement Benefits - Defined Benefit Plans - General" Update No. 2018-14. Update No. 2018-14 was issued in August 2018 to remove disclosures that no longer are considered cost beneficial, clarify the specific requirements of disclosures, and add certain disclosure requirements. The amendments in this update are effective for fiscal years ending after December 15, 2020, for public business entities. Early adoption is permitted. An entity should apply the amendments in this update on a retrospective basis to all periods presented. The adoption of this standard will not have an impact on the Company's consolidated financial position. FASB ASC Topic 820 "Fair Value Measurement" Update No. 2018-13.

SUMMARY OF SIGNIFICANT ACCOUN_3

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)	12 Months Ended
	Dec. 31, 2018
Accounting Policies [Abstract]
Schedule of Finite-Lived Intangible Asses Useful Lives	The range of useful lives is as follows: Core deposit intangibles 10 years Noncompete agreements 1-3 years Customer Lists 12 years Leases 3-30 years

ACQUISITIONS (Tables)

ACQUISITIONS (Tables)	12 Months Ended
	Dec. 31, 2018
Business Acquisition [Line Items]
Schedule of Estimated Fair Value of Assets Acquired and Liabilities Assumed	The following table summarizes the estimated fair value of the assets acquired and liabilities assumed as of the date of the acquisition: Net Assets Acquired at Fair Value (Dollars in thousands) Assets Cash $ 11,137 Loans 155,551 Premises and equipment 5,828 Goodwill 10,280 Core deposit and other intangibles 2,964 Other assets 4,629 Total assets acquired 190,389 Liabilities Deposits 159,580 Borrowings 2,475 Other liabilities 18 Total liabilities assumed 162,073 Purchase price $ 28,316 Net Assets Acquired at Fair Value (Dollars in thousands) Assets Cash $ 6,743 Investments 25,358 Loans 293,498 Premises and equipment 1,904 Goodwill 24,299 Core deposit and other intangibles 8,588 Other assets 8,639 Total assets acquired 369,029 Liabilities Deposits 278,204 Borrowings 33,093 Other liabilities 1,609 Total liabilities assumed 312,906 Purchase price $ 56,123
Business Acquisition, Pro Forma Information [Table Text Block]	The selected pro forma financial information is presented for illustrative purposes only and is not necessarily indicative of the financial results of the combined companies had the acquisition actually been completed at the beginning of the periods presented, nor does it indicate future results for any other interim or full-year period. Years Ended December 31 2018 2017 Net interest income after provision for loan losses $ 304,049 $ 267,104 Net income 129,797 88,518 Years Ended December 31 2017 2016 Net interest income after provision for loan losses $ 258,017 $ 227,429 Net income 90,025 78,150

SECURITIES (Tables)

SECURITIES (Tables)	12 Months Ended
	Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Schedule of Equity securities gains and losses [Table Text Block]	The following table represents a summary of the gains and losses that relates to equity securities for the periods indicated: Years Ended December 31 2018 2017 2016 Net losses recognized during the period on equity securities $ (1,225 ) n/a n/a Less: net gains recognized during the period on equity securities sold during the period 874 n/a n/a Unrealized losses recognized during the reporting period on equity securities still held at the reporting date $ (2,099 ) n/a n/a
Schedule of Available-for-sale Securities and Held-to-maturity Securities	The following table presents a summary of the amortized cost, gross unrealized holding gains and losses and fair value of securities available for sale and securities held to maturity for the periods indicated: December 31, 2018 December 31, 2017 Amortized Gross Gross Unrealized Fair Amortized Gross Gross Unrealized Fair (Dollars in thousands) Available for sale securities U.S. government agency securities $ 32,477 $ — $ (439 ) $ 32,038 $ 35,475 $ 86 $ (131 ) $ 35,430 Agency mortgage-backed securities 222,491 1,020 (3,406 ) 220,105 214,934 1,897 (1,067 ) 215,764 Agency collateralized mortgage obligations 138,149 197 (3,435 ) 134,911 124,098 78 (2,164 ) 122,012 State, county, and municipal securities 1,719 16 — 1,735 2,237 37 — 2,274 Single issuer trust preferred securities issued by banks 717 — (10 ) 707 2,012 4 — 2,016 Pooled trust preferred securities issued by banks and insurers 1,678 — (349 ) 1,329 2,179 — (539 ) 1,640 Small business administration pooled securities 53,317 — (1,390 ) 51,927 47,852 44 (118 ) 47,778 Equity securities — — — — 19,432 1,594 (442 ) 20,584 Total available for sale securities 450,548 1,233 (9,029 ) 442,752 448,219 3,740 (4,461 ) 447,498 Held to maturity securities U.S. treasury securities 1,004 11 — 1,015 1,006 29 — 1,035 Agency mortgage-backed securities 252,484 1,548 (3,104 ) 250,928 204,768 1,791 (736 ) 205,823 Agency collateralized mortgage obligations 332,775 869 (6,920 ) 326,724 262,998 397 (4,987 ) 258,408 Single issuer trust preferred securities issued by banks 1,500 — (10 ) 1,490 1,500 29 — 1,529 Small business administration pooled securities 23,727 105 (349 ) 23,483 27,416 183 (200 ) 27,399 Total held to maturity securities 611,490 2,533 (10,383 ) 603,640 497,688 2,429 (5,923 ) 494,194 Total $ 1,062,038 $ 3,766 $ (19,412 ) $ 1,046,392 $ 945,907 $ 6,169 $ (10,384 ) $ 941,692
Schedule of Contractual Maturities of Securities	A schedule of the contractual maturities of securities available for sale and securities held to maturity as of December 31, 2018 is presented below: Due in one year or less Due after one year to five years Due after five to ten years Due after ten years Total Amortized Cost Fair Value Amortized Cost Fair Value Amortized Cost Fair Value Amortized Cost Fair Value Amortized Cost Fair Value (Dollars in thousands) Available for sale securities U.S. government agency securities $ — $ — $ 20,010 $ 19,903 $ 12,467 $ 12,135 $ — $ — $ 32,477 $ 32,038 Agency mortgage-backed securities 89 90 52,452 51,761 89,408 88,402 80,542 79,852 222,491 220,105 Agency collateralized mortgage obligations — — — — — — 138,149 134,911 138,149 134,911 State, county, and municipal securities — — 770 771 949 964 — — 1,719 1,735 Single issuer trust preferred securities issued by banks — — — — — — 717 707 717 707 Pooled trust preferred securities issued by banks and insurers — — — — — — 1,678 1,329 1,678 1,329 Small business administration pooled securities — — — — — — 53,317 51,927 53,317 51,927 Total available for sale securities $ 89 $ 90 $ 73,232 $ 72,435 $ 102,824 $ 101,501 $ 274,403 $ 268,726 $ 450,548 $ 442,752 Held to maturity securities U.S. Treasury securities $ — $ — $ 1,004 $ 1,015 $ — $ — $ — $ — $ 1,004 $ 1,015 Agency mortgage-backed securities — — 12,098 11,966 35,703 35,310 204,683 203,652 252,484 250,928 Agency collateralized mortgage obligations — — — — 735 732 332,040 325,992 332,775 326,724 State, county, and municipal securities — — — — — — — — — — Single issuer trust preferred securities issued by banks — — — — 1,500 1,490 — — 1,500 1,490 Small business administration pooled securities — — — — — — 23,727 23,483 23,727 23,483 Total held to maturity securities $ — $ — $ 13,102 $ 12,981 $ 37,938 $ 37,532 $ 560,450 $ 553,127 $ 611,490 $ 603,640
Schedule of Gross Unrealized Losses and Fair Value of Investments	December 31, 2018 Less than 12 months 12 months or longer Total Description of securities # of Fair Value Unrealized Fair Unrealized Fair Value Unrealized (Dollars in thousands) U.S. government agency securities 3 $ 9,960 $ (43 ) $ 22,078 $ (396 ) $ 32,038 $ (439 ) Agency mortgage-backed securities 144 104,616 (1,363 ) 222,850 (5,147 ) 327,466 (6,510 ) Agency collateralized mortgage obligations 48 57,871 (398 ) 279,229 (9,957 ) 337,100 (10,355 ) Single issuer trust preferred securities issued by banks and insurers 2 2,197 (20 ) — — 2,197 (20 ) Pooled trust preferred securities issued by banks and insurers 1 — — 1,329 (349 ) 1,329 (349 ) Small business administration pooled securities 7 28,257 (662 ) 40,621 (1,077 ) 68,878 (1,739 ) Total temporarily impaired securities 205 $ 202,901 $ (2,486 ) $ 566,107 $ (16,926 ) $ 769,008 $ (19,412 ) December 31, 2017 Less than 12 months 12 months or longer Total Description of securities # of Fair Value Unrealized Fair Unrealized Fair Value Unrealized (Dollars in thousands) U.S.government agency securities 4 $ 24,343 $ (131 ) $ — $ — $ 24,343 $ (131 ) Agency mortgage-backed securities 84 $ 235,411 $ (1,493 ) $ 14,886 $ (310 ) $ 250,297 $ (1,803 ) Agency collateralized mortgage obligations 42 178,142 (1,579 ) 159,506 (5,572 ) 337,648 (7,151 ) Pooled trust preferred securities issued by banks and insurers 1 — — 1,640 (539 ) 1,640 (539 ) Small business administration pooled securities 4 34,553 (223 ) 9,647 (95 ) 44,200 (318 ) Equity securities 28 3,290 (39 ) 7,619 (403 ) 10,909 (442 ) Total temporarily impaired securities 163 $ 475,739 $ (3,465 ) $ 193,298 $ (6,919 ) $ 669,037 $ (10,384 )

LOANS, ALLOWANCE FOR LOAN LOS_2

LOANS, ALLOWANCE FOR LOAN LOSSES AND CREDIT QUALITY (Tables)	12 Months Ended
	Dec. 31, 2018
Loans, Allowance for Loan Losses and Credit Quality [Abstract]
Schedule of Allowance for Loan Losses	The following table summarizes changes in the allowance for loan losses by loan category and bifurcates the amount of allowance allocated to each loan category based on collective impairment analysis and loans evaluated individually for impairment: December 31, 2018 Commercial Commercial Commercial Small Residential Home Other Consumer Total (Dollars in thousands) Allowance for loan losses Beginning balance $ 13,256 $ 31,453 $ 5,698 $ 1,577 $ 2,822 $ 5,390 $ 447 $ 60,643 Charge-offs (355 ) (82 ) — (372 ) (148 ) (293 ) (1,347 ) (2,597 ) Recoveries 182 188 — 46 12 156 888 1,472 Provision (benefit) 2,677 811 (540 ) 505 533 355 434 4,775 Ending balance $ 15,760 $ 32,370 $ 5,158 $ 1,756 $ 3,219 $ 5,608 $ 422 $ 64,293 Ending balance: collectively evaluated for impairment $ 15,753 $ 32,333 $ 5,158 $ 1,755 $ 2,357 $ 5,444 $ 414 $ 63,214 Ending balance: individually evaluated for impairment $ 7 $ 37 $ — $ 1 $ 862 $ 164 $ 8 $ 1,079 Financing receivables ending balance: Collectively evaluated for impairment $ 1,064,800 $ 3,235,418 $ 365,165 $ 164,135 $ 906,959 $ 1,085,961 $ 15,901 $ 6,838,339 Individually evaluated for impairment 28,829 10,839 — 541 12,706 5,948 197 59,060 Purchased credit impaired loans — 4,991 — — 3,629 175 — 8,795 Total loans by group $ 1,093,629 $ 3,251,248 $ 365,165 $ 164,676 $ 923,294 $ 1,092,084 $ 16,098 $ 6,906,194 (1) December 31, 2017 Commercial Commercial Commercial Small Residential Home Other Consumer Total (Dollars in thousands) Allowance for loan losses Beginning balance $ 16,921 $ 30,369 $ 4,522 $ 1,502 $ 2,621 $ 5,238 $ 393 $ 61,566 Charge-offs (3,891 ) (39 ) — (302 ) (207 ) (276 ) (1,494 ) (6,209 ) Recoveries 615 385 — 114 31 198 993 2,336 Provision (benefit) (389 ) 738 1,176 263 377 230 555 2,950 Ending balance $ 13,256 $ 31,453 $ 5,698 $ 1,577 $ 2,822 $ 5,390 $ 447 $ 60,643 Ending balance: collectively evaluated for impairment $ 13,246 $ 31,411 $ 5,698 $ 1,576 $ 1,815 $ 5,125 $ 430 $ 59,301 Ending balance: individually evaluated for impairment $ 10 $ 42 $ — $ 1 $ 1,007 $ 265 $ 17 $ 1,342 Financing receivables ending balance: Collectively evaluated for impairment $ 853,885 $ 3,093,945 $ 401,797 $ 131,667 $ 733,809 $ 1,045,053 $ 9,573 $ 6,269,729 Individually evaluated for impairment 34,643 16,638 — 703 13,684 6,826 307 72,801 Purchased credit impaired loans — 5,978 — — 6,836 209 — 13,023 Total loans by group $ 888,528 $ 3,116,561 $ 401,797 $ 132,370 $ 754,329 $ 1,052,088 $ 9,880 $ 6,355,553 (1) December 31, 2016 Commercial Commercial Commercial Small Residential Other Consumer Total (Dollars in thousands) Allowance for loan losses Beginning balance $ 13,802 $ 27,327 $ 5,366 $ 1,264 $ 2,590 $ 4,889 $ 587 $ 55,825 Charge-offs (593 ) (414 ) — (228 ) (28 ) (602 ) (1,607 ) (3,472 ) Recoveries 859 564 — 195 299 141 1,080 3,138 Provision (benefit) 2,853 2,892 (844 ) 271 (240 ) 810 333 6,075 Ending balance $ 16,921 $ 30,369 $ 4,522 $ 1,502 $ 2,621 $ 5,238 $ 393 $ 61,566 Ending balance: collectively evaluated for impairment $ 13,260 $ 30,173 $ 4,522 $ 1,494 $ 1,535 $ 4,996 $ 372 $ 56,352 Ending balance: individually evaluated for impairment $ 3,661 $ 196 $ — $ 8 $ 1,086 $ 242 $ 21 $ 5,214 Financing receivables ending balance: Collectively evaluated for impairment $ 862,875 $ 2,983,642 $ 320,391 $ 121,855 $ 622,392 $ 982,095 $ 10,666 $ 5,903,916 Individually evaluated for impairment 39,178 16,813 — 871 14,175 5,863 397 77,297 Purchase credit impaired loans — 10,343 — — 7,859 189 1 18,392 Total loans by group $ 902,053 $ 3,010,798 $ 320,391 $ 122,726 $ 644,426 $ 988,147 $ 11,064 $ 5,999,605 (1) (1) The amount of net deferred costs on originated loans included in the ending balance was $7.1 million , $6.1 million and $5.1 million at December 31, 2018 , 2017 and 2016 , respectively. Net unamortized discounts on acquired loans not deemed to be PCI included in the ending balance were $15.2 million , $9.4 million and $8.6 million at December 31, 2018 , 2017 and 2016
Schedule of Internal Risk-Rating Categories for the Company's Commercial Portfolio	The following table details the amount of outstanding principal balances relative to each of the risk-rating categories for the Company’s commercial portfolio: December 31, 2018 Category Risk Commercial and Commercial Real Commercial Small Business Total (Dollars in thousands) Pass 1 - 6 $ 1,014,370 $ 3,156,989 $ 361,884 $ 161,851 $ 4,695,094 Potential weakness 7 16,860 56,840 298 888 74,886 Definite weakness - loss unlikely 8 58,909 37,419 2,983 1,937 101,248 Partial loss probable 9 3,490 — — — 3,490 Definite loss 10 — — — — — Total $ 1,093,629 $ 3,251,248 $ 365,165 $ 164,676 $ 4,874,718 December 31, 2017 Category Risk Commercial and Commercial Real Commercial Small Business Total (Dollars in thousands) Pass 1 - 6 $ 806,331 $ 3,007,672 $ 400,964 $ 130,265 $ 4,345,232 Potential weakness 7 16,563 69,788 — 1,471 87,822 Definite weakness - loss unlikely 8 59,415 38,637 833 631 99,516 Partial loss probable 9 6,219 464 — 3 6,686 Definite loss 10 — — — — — Total $ 888,528 $ 3,116,561 $ 401,797 $ 132,370 $ 4,539,256
Schedule of Weighted Average FICO Scores and Weighted Average Combined LTV Ratio	December 31 2018 2017 Residential portfolio FICO score (re-scored)(1) 749 745 LTV (re-valued)(2) 58.6 % 59.2 % Home equity portfolio FICO score (re-scored)(1) 767 766 LTV (re-valued)(2)(3) 49.3 % 50.1 % (1) The average FICO scores at December 31, 2018 are based upon rescores available from November 2018 and origination score data for loans booked in December 2018. The average FICO scores at December 31, 2017 are based upon rescores available from August 2017 and origination score data for loans booked between September and December 2017. (2) The combined LTV ratios for December 31, 2018 are based upon updated automated valuations as of November 2018, when available, and/or the most current valuation data available. The combined LTV ratios for December 31, 2017 are based upon updated automated valuations as of August 2017, when available, and /or the most current valuation data available. The updated automated valuations provide new information on loans that may be available since the previous valuation was obtained. If no new information is available, the valuation will default to the previously obtained data or most recent appraisal. (3)
Schedule of Nonaccrual Loans	The following table shows the carrying value of nonaccrual loans at the dates indicated: December 31 2018 2017 (Dollars in thousands) Commercial and industrial $ 26,310 $ 32,055 Commercial real estate 3,015 3,123 Commercial construction 311 — Small business 235 230 Residential real estate 8,251 8,129 Home equity 7,278 6,022 Other consumer 13 71 Total nonaccrual loans (1) $ 45,413 $ 49,630 (1) Included in these amounts were $29.3 million and $6.1 million of nonaccruing TDRs at December 31, 2018 and 2017
Foreclosed Residential Real Estate Property [Table Text Block]	The following table shows information regarding foreclosed residential real estate property at the date indicated: December 31, 2018 December 31, 2017 (Dollars in thousands) Foreclosed residential real estate property held by the creditor $ — $ 612 Recorded investment in mortgage loans collateralized by residential real estate property that are in the process of foreclosure $ 3,174 $ 2,971
Schedule of the Age Analysis of Past Due Financing Receivables	The following table shows the age analysis of past due financing receivables as of the dates indicated: December 31, 2018 30-59 days 60-89 days 90 days or more Total Past Due Current Total Recorded Number Principal Number Principal Number Principal Number Principal (Dollars in thousands) Commercial and industrial — $ — 4 $ 382 11 $ 26,311 15 $ 26,693 $ 1,066,936 $ 1,093,629 $ — Commercial real estate 9 1,627 — — 8 2,250 17 3,877 3,247,371 3,251,248 — Commercial construction 1 1,271 — — 1 311 2 1,582 363,583 365,165 — Small business 15 506 19 87 24 162 58 755 163,921 164,676 — Residential real estate 23 3,486 6 521 25 4,382 54 8,389 914,905 923,294 — Home equity 22 1,331 12 855 29 2,663 63 4,849 1,087,235 1,092,084 — Other consumer (1) 330 181 15 9 12 13 357 203 15,895 16,098 5 Total 400 $ 8,402 56 $ 1,854 110 $ 36,092 566 $ 46,348 $ 6,859,846 $ 6,906,194 $ 5 December 31, 2017 30-59 days 60-89 days 90 days or more Total Past Due Current Total Recorded Number Principal Number Principal Number Principal Number Principal (Dollars in thousands) Commercial and industrial 2 $ 195 2 $ 370 14 $ 32,007 18 $ 32,572 $ 855,956 $ 888,528 $ — Commercial real estate 7 3,060 — — 9 1,793 16 4,853 3,111,708 3,116,561 — Commercial construction — — — — — — — — 401,797 401,797 — Small business 17 339 11 144 10 57 38 540 131,830 132,370 — Residential real estate 6 870 13 2,385 22 3,471 41 6,726 747,603 754,329 — Home equity 22 1,310 6 451 20 2,025 48 3,786 1,048,302 1,052,088 — Other consumer (1) 265 197 16 27 17 45 298 269 9,611 9,880 8 Total 319 $ 5,971 48 $ 3,377 92 $ 39,398 459 $ 48,746 $ 6,306,807 $ 6,355,553 $ 8 (1)
Schedule of Troubled Debt Restructuring and Other Pertinent Information	The following table shows the Company’s total TDRs and other pertinent information as of the dates indicated: December 31 2018 2017 (Dollars in thousands) TDRs on accrual status $ 23,849 $ 25,852 TDRs on nonaccrual status 29,348 (1) 6,067 Total TDRs $ 53,197 $ 31,919 Amount of specific reserves included in the allowance for loan loss associated with TDRs: $ 1,079 $ 1,342 Additional commitments to lend to a borrower who has been a party to a TDR: $ 982 $ 487
Schedule of Troubled Debt Restructuring Modifications	The following table shows the modifications which occurred during the periods indicated and the change in the recorded investment subsequent to the modifications occurring: Years Ended December 31 2018 Number Pre-Modification Post-Modification (Dollars in thousands) Troubled debt restructurings Commercial and industrial (1) 12 $ 35,688 $ 39,224 Commercial real estate 3 1,600 1,600 Residential real estate 5 1,048 1,071 Home equity 9 562 562 Total 29 $ 38,898 $ 42,457 2017 Troubled debt restructurings Commercial and industrial 12 $ 1,787 $ 1,787 Commercial real estate 6 2,705 2,705 Small business 9 369 369 Residential real estate 10 1,284 1,326 Home equity 17 1,985 1,988 Total 54 $ 8,130 $ 8,175 2016 Troubled debt restructurings Commercial and industrial 10 $ 1,623 $ 1,623 Commercial real estate 10 2,959 2,959 Small business 3 188 188 Residential real estate 8 1,808 1,850 Home equity 13 932 932 Other consumer 6 153 153 Total 50 $ 7,663 $ 7,705 (1)
Schedule of Post-Modification Balance of Troubled Debt Restructuring by Type of Modification	The following table shows the Company’s post-modification balance of TDRs listed by type of modification as of the periods indicated: Years Ended December 31 2018 2017 2016 (Dollars in thousands) Extended maturity $ 2,878 $ 5,881 $ 5,044 Adjusted interest rate 57 — 92 Combination rate and maturity 38,812 568 1,035 Court ordered concession 710 1,726 1,534 Total $ 42,457 $ 8,175 $ 7,705
Schedule of Troubled Debt Restructurings Which Have Subsequently Defaulted	The Company considers a loan to have defaulted when it reaches 90 days past due. As of December 31, 2018, there were no loans modified during the past twelve months that subsequently defaulted. There was one commercial and industrial loan modified during the proceeding twelve month period that ended December 31, 2017 with a recorded investment of $122,000 , which subsequently defaulted. During the twelve months ended December 31, 2016 there was one commercial real estate loan that was modified during the proceeding twelve month period, with a recorded investment of $249,000 , which subsequently defaulted.
Schedule of Impaired Loans by Loan Portfolio	The tables below set forth information regarding the Company’s impaired loans. The information for average recorded investment and interest income recognized is reflective of the full period being presented and does not take into account the date at which a loan was deemed to be impaired. See information below as of the dates indicated: As of and For the Years Ended December 31 2018 Recorded Unpaid Related Average Interest Income Recognized (Dollars in thousands) With no related allowance recorded Commercial and industrial $ 28,459 $ 35,913 $ — $ 31,117 $ 142 Commercial real estate 9,552 9,832 — 10,561 519 Small business 358 439 — 401 14 Residential real estate 4,518 4,686 — 4,597 212 Home equity 4,957 5,199 — 5,230 220 Other consumer 56 56 — 64 4 Subtotal 47,900 56,125 — 51,970 1,111 With an allowance recorded Commercial and industrial 370 370 7 385 19 Commercial real estate 1,287 1,287 37 1,311 74 Small business 183 223 1 225 13 Residential real estate 8,188 9,217 862 8,459 289 Home equity 991 1,149 164 1,018 43 Other consumer 141 143 8 154 5 Subtotal 11,160 12,389 1,079 11,552 443 Total $ 59,060 $ 68,514 $ 1,079 $ 63,522 $ 1,554 2017 Recorded Unpaid Related Average Interest (Dollars in thousands) With no related allowance recorded Commercial and industrial $ 34,267 $ 38,329 $ — $ 36,631 $ 446 Commercial real estate 13,245 14,374 — 13,683 559 Small business 556 619 — 569 21 Residential real estate 4,264 4,397 — 4,332 218 Home equity 4,950 5,056 — 5,063 198 Other consumer 91 92 — 102 7 Subtotal 57,373 62,867 — 60,380 1,449 With an allowance recorded Commercial and industrial 376 376 10 391 19 Commercial real estate 3,393 3,399 42 3,447 198 Small business 147 153 1 238 14 Residential real estate 9,420 10,154 1,007 9,575 284 Home equity 1,876 2,110 265 1,916 55 Other consumer 216 217 17 233 7 Subtotal 15,428 16,409 1,342 15,800 577 Total $ 72,801 $ 79,276 $ 1,342 $ 76,180 $ 2,026 2016 Recorded Unpaid Related Average Interest (Dollars in thousands) With no related allowance recorded Commercial and industrial $ 28,776 $ 29,772 $ — $ 26,472 $ 927 Commercial real estate 11,628 12,891 — 12,744 437 Commercial construction — — — — — Small business 494 569 — 534 20 Residential real estate 4,216 4,427 — 4,302 185 Home equity 4,485 4,572 — 4,602 184 Other consumer 146 146 — 160 11 Subtotal 49,745 52,377 — 48,814 1,764 With an allowance recorded Commercial and industrial 10,402 10,440 3,661 10,760 325 Commercial real estate 5,185 5,533 196 5,491 200 Small business 377 392 8 408 21 Residential real estate 9,959 10,530 1,086 10,065 332 Home equity 1,378 1,547 242 1,403 50 Other consumer 251 252 21 268 8 Subtotal 27,552 28,694 5,214 28,395 936 Total $ 77,297 $ 81,071 $ 5,214 $ 77,209 $ 2,700
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Table Text Block]	The following table displays certain information pertaining to PCI loans at the dates indicated: December 31 2018 2017 (Dollars in thousands) Outstanding balance $ 9,749 $ 14,485 Carrying amount $ 8,795 $ 13,023
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Table Text Block]	The following table summarizes activity in the accretable yield for the PCI loan portfolio: 2018 2017 (Dollars in thousands) Beginning balance $ 1,791 $ 2,370 Accretion (1,135 ) (1,475 ) Other change in expected cash flows (1) 310 748 Reclassification from nonaccretable difference for loans which have paid off (2) 225 148 Ending balance $ 1,191 $ 1,791 (1) Represents changes in cash flows expected to be collected resulting in increased interest income as a prospective yield adjustment over the remaining life of the loan(s). (2)

BANK PREMISES AND EQUIPMENT (Ta

BANK PREMISES AND EQUIPMENT (Tables)	12 Months Ended
	Dec. 31, 2018
Property, Plant and Equipment [Abstract]
Schedule of Premises and Equipment	BANK PREMISES AND EQUIPMENT Bank premises and equipment at December 31, were as follows: 2018 2017 Estimated (Dollars in thousands) (In years) Cost Land $ 24,502 $ 23,719 n/a Bank premises 53,052 49,159 5-40 Leasehold improvements 27,615 25,184 1-27 Furniture and equipment 66,974 62,521 2-12 Leased equipment 10,644 10,644 7 Total cost 182,787 171,227 Accumulated depreciation (85,206 ) (76,505 ) Net bank premises and equipment $ 97,581 $ 94,722

GOODWILL AND IDENTIFIABLE INT_2

GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS (Tables)	12 Months Ended
	Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Intangible Assets and Goodwill	The following table sets forth the carrying value of goodwill and other intangible assets, net of accumulated amortization, at December 31: 2018 2017 (Dollars in thousands) Balances not subject to amortization Goodwill $ 256,105 $ 231,806 Balances subject to amortization Core deposit intangibles 13,692 8,636 Other intangible assets 1,558 705 Total other intangible assets 15,250 9,341 Total goodwill and other intangible assets $ 271,355 $ 241,147
Schedule of Goodwill	The changes in the carrying value of goodwill for the periods indicated were as follows: 2018 2017 (Dollars in thousands) Balance at beginning of year $ 231,806 $ 221,526 Acquisitions 24,299 10,280 Balance at end of year $ 256,105 $ 231,806
Schedule of Other Intangible Assets	The gross carrying amount and accumulated amortization of other intangible assets were as follows at the dates indicated: December 31 2018 2017 Gross Accumulated Net Gross Accumulated Net (Dollars in thousands) Core deposit intangibles $ 34,137 $ (20,445 ) $ 13,692 $ 26,736 $ (18,100 ) $ 8,636 Other intangible assets 3,103 (1,545 ) 1,558 3,165 (2,460 ) 705 Total $ 37,240 $ (21,990 ) $ 15,250 $ 29,901 $ (20,560 ) $ 9,341
Schedule of Intangible Assets Estimated Annual Amortization Expense	The following table sets forth the estimated annual amortization expense of intangible assets for each of the next five years: Year Amount (Dollars in thousands) 2019 $ 3,050 2020 $ 2,647 2021 $ 2,394 2022 $ 1,962 2023 $ 1,697

DEPOSITS (Tables)

DEPOSITS (Tables)	12 Months Ended
	Dec. 31, 2018
Banking and Thrift [Abstract]
Schedule of Time Deposits Maturities	The following is a summary of the scheduled maturities of time deposits as of December 31: 2018 2017 (Dollars in thousands) 1 year or less $ 511,292 71.9 % $ 393,452 61.1 % Over 1 year to 2 years 111,487 15.7 % 119,341 18.5 % Over 2 years to 3 years 41,523 5.8 % 57,619 8.9 % Over 3 years to 4 years 27,040 3.8 % 41,183 6.4 % Over 4 years to 5 years 19,761 2.8 % 32,706 5.1 % Total $ 711,103 100.0 % $ 644,301 100.0 %

BORROWINGS (Tables)

BORROWINGS (Tables)	12 Months Ended
	Dec. 31, 2018
Debt Disclosure [Abstract]
Schedule of Federal Home Loan Bank Borrowings	Advances payable to the Federal Home Loan Bank as of December 31 are summarized as follows: 2018 2017 Weighted Weighted Average Average Total Contractual Total Contractual Outstanding Rate Outstanding Rate (Dollars in thousands) Stated Maturity 2018 $ — — % $ 52,475 1.58 % 2019 147,046 2.68 % — — % Subtotal 147,046 2.68 % 52,475 1.58 % Amortizing advances 760 789 Total Federal Home Loan Bank Advances $ 147,806 $ 53,264
Schedule of Underlying Assets of Repurchase Agreements when Amount of Repurchase Agreements Exceeds 10 Percent of Assets [Table Text Block]	The table below sets forth the remaining contractual maturity of the Company’s repurchase agreements allocated by source of collateral at the dates indicated: December 31 2018 2017 (Dollars in thousands) Sources of collateral U.S. government agency securities $ — $ 16,867 Agency mortgage-backed securities — 51,273 Agency collateralized mortgage obligations — 94,539 Total customer repurchase agreements (1) $ — $ 162,679
Schedule of Long-term Borrowings	The following table summarizes long-term debt, net of debt issuances costs, as of the periods indicated: December 31 2018 2017 (Dollars in thousands) Junior subordinated debentures Capital Trust V $ 51,505 $ 51,503 Slades Ferry Trust I 10,234 10,229 Central Trust I 5,258 5,258 Central Trust II 6,083 6,083 East Main Street Trust 3,093 — Subordinated debentures 34,728 34,682 Total long-term debt $ 110,901 $ 107,755
Information relating to Trust Preferred Securities [Table Text Block]	Information relating to these trust preferred securities is as follows: Trust Description of Capital Securities Capital Trust V $50.0 million due in 2037, interest at a variable rate of 3 month LIBOR plus 1.48% (4.27% at December 31, 2018),which, effective on January 17, 2017, has been converted to a fixed rate of 2.84% through the use of an interest rate swap. Slades Ferry Trust I $10.0 million due in 2034, bearing interest at a variable rate of 3 month LIBOR plus 2.79% (5.59% at December 31, 2018). These securities are callable quarterly, until maturity. Central Trust I $5.1 million due in 2034, bearing interest at a variable rate of 3 month LIBOR plus 2.44% (5.23% at December 31, 2018). These securities are callable quarterly, until maturity. Central Trust II $5.9 million due in 2037, bearing interest at a variable rate of 3 month LIBOR plus 1.65% (4.44% at December 31, 2018). These securities are callable quarterly, until maturity.
Schedule of Maturities of Borrowings	The following table sets forth the contractual maturities of long-term debt over the next five years: 2019 2020 2021 2022 2023 Thereafter Total (Dollars in thousands) Junior subordinated debentures Capital trust V $ — $ — $ — $ — $ — $ 51,547 $ 51,547 Slades ferry trust I — — — — — 10,310 10,310 Central trust I — — — — — 5,258 5,258 Central trust II — — — — — 6,083 6,083 East Main Street Trust — — — — — 3,093 3,093 Subordinated debentures — — — — — 35,000 35,000 Total $ — $ — $ — $ — $ — $ 111,291 $ 111,291

EARNINGS PER SHARE (Tables)

EARNINGS PER SHARE (Tables)	12 Months Ended
	Dec. 31, 2018
Earnings Per Share [Abstract]
Schedule of the Components of Earnings Per Share	Earnings per share consisted of the following components for the years ended December 31: 2018 2017 2016 (Dollars in thousands, except per share data) Net income $ 121,622 $ 87,204 $ 76,648 Weighted Average Shares Basic shares 27,592,380 27,294,028 26,404,071 Effect of dilutive securities 61,428 78,076 51,847 Diluted shares 27,653,808 27,372,104 26,455,918 Net income per share Basic EPS $ 4.41 $ 3.19 $ 2.90 Effect of dilutive securities (0.01 ) — — Diluted EPS $ 4.40 $ 3.19 $ 2.90

STOCK BASED COMPENSATION (Table

STOCK BASED COMPENSATION (Tables)	12 Months Ended
	Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of Cumulatively Granted Stock Options and Restricted Stock Awards, Net of Forfeitures and Expirations	The following table presents the amount of cumulatively granted stock option awards and restricted stock awards, net of forfeitures and expirations, through December 31, 2018 : Authorized Awards Cumulatively Granted, Net of Total Authorized Stock Restricted 2005 Plan 1,650,000 387,258 750,931 1,138,189 511,811 2010 Plan 314,600 46,500 93,245 139,745 174,855 (1) 2018 Plan 300,000 — 6,000 6,000 294,000 (1)
Schedule of Pre-tax Compensation Expense and Related Tax Benefits	The following table presents the pre-tax expense associated with stock option and restricted stock awards and the related tax benefits recognized for the periods presented: Years Ended December 31 2018 2017 2016 (Dollars in thousands) Stock based compensation expense Restricted stock awards(1) $ 3,299 $ 2,730 $ 2,590 Directors’ fee expense Stock options 66 76 72 Restricted stock awards 860 527 303 Total stock based award expense $ 4,225 $ 3,333 $ 2,965 Related tax benefits recognized in earnings $ 1,188 $ 1,362 $ 1,211 (1)
Schedule of Stock Options Granted	The following table presents the awards granted by the Company of nonqualified options to purchase shares of common stock for the periods presented: Years Ended December 31 2018 2017 2016 Date of grant 4/3/2018 11/7/2017 7/14/2016 2/20/2016 Plan 2010 2010 2010 2010 Options granted 5,000 5,000 5,000 5,000 Vesting period (beginning on the grant date) 21 months 14 months 18 months 22 months Expiration date 4/3/2028 11/7/2027 7/14/2026 2/20/2026 Expected volatility 21.15 % 20.80 % 32.28 % 32.44 % Expected life (years) 5.5 5.5 5.5 5.5 Expected dividend yield 1.94 % 1.87 % 2.37 % 2.28 % Risk free interest rate 2.62 % 2.02 % 1.14 % 1.29 % Fair value per option $ 13.46 $ 12.43 $ 11.46 $ 10.59
Schedule of Relevant Information Relating to Stock Options	The following table presents relevant information relating to the Company’s stock options for the periods presented: Years Ended December 31 2018 2017 2016 (Dollars in thousands, except per share data) Fair value of stock options vested based on grant date fair value $ 85 $ 72 $ 37 Intrinsic value of stock options exercised $ 1,525 $ 1,082 $ 494 Cash received from stock option exercises $ 1,024 $ 918 $ 680 Tax benefit realized on stock option exercises $ 429 $ 442 $ 204 Weighted average grant date fair value of options granted (per share) $ 13.46 $ 12.43 $ 11.03
Schedule of Stock Options	summary of stock option award activity for the year ended December 31, 2018 . Outstanding Nonvested Stock Option Weighted Weighted Aggregate Stock Weighted (Dollars in thousands, except per share data) Balance at January 1, 2018 84,000 $ 32.16 4,999 $ 12.11 Granted 5,000 70.85 5,000 13.46 Exercised (34,500 ) 29.67 n/a n/a Vested n/a n/a (6,667 ) 12.70 Forfeited — — — — Expired — — — — Balance at December 31, 2018 54,500 (2) $ 37.28 4.02 years $ 1,776 3,332 $ 12.94 Options outstanding and expected to vest at December 31, 2018 54,500 (3) $ 37.28 4.02 years $ 1,776 Options exercisable at December 31, 2018 51,168 (4) $ 35.12 3.69 years $ 1,776 Unrecognized compensation cost $ 23 Weighted average remaining recognition period (years) 1.00 (1) The aggregate intrinsic value represents the total pre-tax intrinsic value, based on the average of the high price and low price at which the Company’s common stock traded on December 31, 2018 of $69.72 , which would have been received by in-the-money option holders had they all exercised their options as of that date. (2) Inclusive of 32,500 stock options outstanding to Directors. (3) Inclusive of 32,500 vested stock options and expected to vest to Directors. (4) Inclusive of 29,168 vested stock options outstanding to Directors.
Schedule of Restricted Stock Granted	The Company grants both time-vested restricted stock awards as well as performance-based restricted stock awards. During the years ended December 31, 2018 , 2017 , and 2016 the Company has made the following restricted stock award grants: Shares Granted Plan Fair Value (1) Vesting Period Time-vested 2018 2/15/2018 39,950 2005 $ 71.75 Ratably over 5 years from grant date 2/27/2018 1,150 2005 $ 72.60 Ratably over 5 years from grant date 5/15/2018 530 2005 $ 74.00 Ratably over 5 years from grant date 5/22/2018 6,000 2018 $ 76.58 Immediately upon grant date 11/15/2018 560 2005 $ 77.78 Ratably over 5 years from grant date 2017 2/13/2017 1,200 2005 $ 62.53 Ratably over 5 years from grant date 2/16/2017 34,150 2005 $ 63.10 Ratably over 5 years from grant date 3/31/2017 500 2005 $ 65.63 Ratably over 5 years from grant date 4/3/2017 1,500 2005 $ 64.14 Once on November 30, 2017 (2) 5/15/2017 1,000 2005 $ 64.03 Ratably over 5 years from grant date 5/23/2017 7,000 2010 $ 61.95 At the end of 5 years from grant date (3) 6/15/2017 950 2005 $ 66.18 Ratably over 5 years from grant date 2016 2/11/2016 51,475 2005 $ 41.96 Ratably over 5 years from grant date 3/1/2016 600 2005 $ 44.37 Ratably over 5 years from grant date 5/24/2016 8,700 2010 $ 48.34 Once on May 24, 2021 (3) 9/19/2016 800 2005 $ 52.92 Ratably over 5 years from grant date 11/7/2016 500 2005 $ 54.28 Ratably over 5 years from grant date 11/14/2016 725 2010 $ 63.43 Once on May 24, 2021 (3) Performance-based 2/15/2018 16,300 2005 $ 71.75 The earlier of: the date on which it is determined if the performance goal has been achieved; or, March 31, 2021. 2/16/2017 14,400 2005 $ 63.10 The earlier of: the date on which it is determined if the performance goal has been achieved; or, March 31, 2020. 2/11/2016 20,450 2005 $ 41.96 The earlier of: the date on which it is determined if the performance goal has been achieved; or, March 31, 2019. (1) The fair value of the restricted stock awards are based upon the average of the high and low prices at which the Company’s common stock traded on the date of grant. The holders of time-vested restricted stock awards participate fully in the rewards of stock ownership of the Company, including voting and dividend rights. The holders of performance-based restricted stock awards do not participate in the rewards of stock ownership of the Company until vested. The holders of all restricted stock awards are not required to pay any consideration to the Company for the awards. (2) This restricted stock grant fully vested upon an employee's termination, on November 30, 2017. (3) These restricted stock grants will vest on May 24, 2021, or earlier if the director ceases to be a director for any reason other than cause, such as, for example, by retirement.
Schedule of Share-based Compensation, Fair Value of Restricted Stock Awards Vesting [Table Text Block]	The following table presents the fair value of restricted stock awards vesting for the periods presented: Years Ended December 31 2018 2017 2016 (Dollars in thousands) Fair value of restricted stock awards upon vesting $ 6,277 $ 5,717 $ 3,019
Schedule of Restricted Stock Awards	summary of restricted stock award activity for the year ended December 31, 2018 : Outstanding Restricted Stock Weighted Average (Dollars in thousands, except per share data) Balance at January 1, 2018 225,965 $ 46.18 Granted 64,490 72.28 Vested/released (86,219 ) 43.39 Forfeited (2,130 ) 53.78 Balance at December 31, 2018 202,106 (1) $ 55.62 Unrecognized compensation cost (inclusive of directors’ fees) $ 6,911 Weighted average remaining recognition period (years) 2.96 (1) Inclusive of 23,385

DERIVATIVES AND HEDGING ACTIV_2

DERIVATIVES AND HEDGING ACTIVITIES (Tables)	12 Months Ended
	Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Details of derivative positions for interest rate swaps which qualify as hedges for accounting purposes	The following table reflects information about the Company’s derivative positions for the periods indicated below for interest rate swaps which qualify as cash flow hedges for accounting purposes: December 31, 2018 Weighted Average Rate Notional Amount Weighted Average Maturity Current Pay Fixed Fair Value (in thousands) (in years) (in thousands) Interest rate swaps on borrowings $ 75,000 3.18 2.74 % 1.53 % $ 2,282 Current Rate Paid Receive Fixed Swap Rate Interest rate swaps on loans 250,000 4.52 2.57 % 2.67 % 2,938 Current Rate Paid Receive Fixed Swap Rate Cap - Floor Interest rate collars on loans 250,000 4.17 2.47 % 3.02% - 2.51% 3,344 Total $ 575,000 $ 8,564 December 31, 2017 Weighted Average Rate Notional Amount Weighted Average Maturity Current Pay Fixed Fair Value (in thousands) (in years) (in thousands) Interest rate swaps on borrowings $ 100,000 3.37 1.54 % 1.89 % $ 1,616 Total $ 100,000 $ 1,616
Summary of customer related derivative positions, not designated as hedging	The following table reflects the Company’s customer related derivative positions for the periods indicated below for those derivatives not designated as hedging: Number of Notional Amount Maturing Less than 1 year Less than 2 years Less than 3 years Less than 4 years Thereafter Total Fair Value December 31, 2018 (Dollars in thousands) Loan level swaps Receive fixed, pay variable 235 $ 50,702 $ 124,222 $ 97,904 $ 47,308 $ 631,471 $ 951,607 $ (2,907 ) Pay fixed, receive variable 220 $ 50,702 $ 124,222 $ 97,904 $ 47,308 $ 631,471 $ 951,607 $ 2,903 Foreign exchange contracts Buys foreign currency, sells U.S. currency 27 $ 60,297 $ 3,505 $ — $ — $ — $ 63,802 $ (1,404 ) Buys U.S. currency, sells foreign currency 27 $ 60,297 $ 3,505 $ — $ — $ — $ 63,802 $ 1,434 December 31, 2017 (Dollars in thousands) Loan level swaps Receive fixed, pay variable 246 $ 36,023 $ 61,500 $ 152,287 $ 111,147 $ 591,385 $ 952,342 $ 3,875 Pay fixed, receive variable 231 $ 36,023 $ 61,500 $ 152,287 $ 111,147 591,385 $ 952,342 $ (3,880 ) Foreign exchange contracts Buys foreign currency, sells U.S. currency 15 $ 26,382 $ 3,780 $ — $ — $ — $ 30,162 $ 1,202 Buys U.S. currency, sells foreign currency 15 $ 26,382 $ 3,780 $ — $ — $ — $ 30,162 $ (1,188 ) (1)
Fair value of derivative financial instruments as well as their classification on the balance sheet	The table below presents the fair value of the Company’s derivative financial instruments as well as their classification on the balance sheet at the periods indicated: Asset Derivatives Liability Derivatives Fair Value at Fair Value at Fair Value at Fair Value at Balance Sheet December 31, 2018 December 31, 2017 Balance Sheet December 31, 2018 December 31, 2017 (Dollars in thousands) Derivatives designated as hedges Interest rate derivatives Other assets $ 8,955 $ 1,880 Other liabilities $ 391 $ 264 Derivatives not designated as hedges Customer Related Positions: Loan level derivatives Other assets 15,580 14,236 Other liabilities 15,584 14,241 Foreign exchange contracts Other assets 1,578 1,202 Other liabilities 1,548 1,188 Mortgage Derivatives Interest rate lock commitments Other assets 91 149 Other liabilities — — Forward sales agreements Other assets 106 9 Other liabilities — — 17,355 15,596 17,132 15,429 Total $ 26,310 $ 17,476 $ 17,523 $ 15,693
Effect of derivative financial instruments included in OCI and current earnings	The table below presents the effect of the Company’s derivative financial instruments included in OCI and current earnings for the periods indicated: Years Ended December 31 2018 2017 2016 (Dollars in thousands) Derivatives designated as hedges Gain in OCI on derivatives (effective portion), net of tax $ 4,829 $ 443 $ 2,170 Gain (loss) reclassified from OCI into interest income or interest expense (effective portion) $ 1,000 $ (441 ) $ (2,520 ) Loss recognized in income on derivatives (ineffective portion and amount excluded from effectiveness testing) Interest expense $ — $ — $ — Other expense — — — Total $ — $ — $ — Derivatives not designated as hedges Changes in fair value of customer related positions Other income $ 46 $ 6 $ 73 Other expenses (29 ) (21 ) (82 ) Changes in fair value of mortgage derivatives Mortgage banking income 39 (39 ) (35 ) Total $ 56 $ (54 ) $ (44 )

BALANCE SHEET OFFSETTING (Table

BALANCE SHEET OFFSETTING (Tables)	12 Months Ended
	Dec. 31, 2018
Offsetting [Abstract]
Financial Instruments Derivative Assets Liabilities and resell agreements net of amount not offset [Table Text Block]	BALANCE SHEET OFFSETTING The Company does not offset fair value amounts recognized for derivative instruments or repurchase agreements. The Company does net the amount recognized for the right to reclaim cash collateral against the obligation to return cash collateral arising from derivative instruments executed with the same counterparty under a master netting arrangement. Collateral legally required to be maintained at dealer banks by the Company is monitored and adjusted as necessary. The following tables present the Company's asset and liability derivative positions and the potential effect of netting arrangements on its financial position, as of the periods indicated: Gross Amounts Not Offset in the Statement of Financial Position Gross Amounts Recognized in the Statement of Financial Position Gross Amounts Offset in the Statement of Financial Position Net Amounts Presented in the Statement of Financial Position Financial Instruments (1) Collateral Pledged (Received) Net Amount December 31, 2018 (Dollars in thousands) Derivative Assets Interest rate swaps $ 8,955 $ — $ 8,955 $ 391 $ (5,527 ) $ 3,037 Loan level derivatives 15,580 — 15,580 6,165 (3,001 ) 6,414 Customer foreign exchange contracts 1,578 — 1,578 — — 1,578 $ 26,113 $ — $ 26,113 $ 6,556 $ (8,528 ) $ 11,029 Derivative Liabilities Interest rate swaps $ 391 $ — $ 391 $ 391 $ — $ — Loan level derivatives 15,584 — 15,584 6,165 173 9,246 Customer foreign exchange contracts 1,548 — 1,548 — — 1,548 $ 17,523 $ — $ 17,523 $ 6,556 $ 173 $ 10,794 (1) Reflects offsetting derivative positions with the same counterparty. Gross Amounts Not Offset in the Statement of Financial Position Gross Amounts Recognized in the Statement of Financial Position Gross Amounts Offset in the Statement of Financial Position Net Amounts Presented in the Statement of Financial Position Financial Instruments (1) Collateral Pledged (Received) Net Amount December 31, 2017 (Dollars in thousands) Derivative Assets Interest rate swaps $ 1,880 $ — $ 1,880 $ 805 $ — $ 1,075 Loan level derivatives 14,236 — 14,236 4,578 — 9,658 Customer foreign exchange contracts 1,202 — 1,202 — — 1,202 $ 17,318 $ — $ 17,318 $ 5,383 $ — $ 11,935 Derivative Liabilities Interest rate swaps $ 264 $ — $ 264 $ — $ 264 $ — Loan level derivatives 14,241 — 14,241 5,383 3,675 5,183 Customer foreign exchange contracts 1,188 — 1,188 — — 1,188 $ 15,693 $ — $ 15,693 $ 5,383 $ 3,939 $ 6,371 Customer repurchase agreements $ 162,679 $ — $ 162,679 $ — $ 162,679 $ — (1)

INCOME TAXES (Tables)

INCOME TAXES (Tables)	12 Months Ended
	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Schedule of Components of Income Taxes	The provision for income taxes is comprised of the following components: Years Ended December 31 2018 2017 2016 (Dollars in thousands) Current expense Federal $ 25,129 $ 28,852 $ 26,549 State 13,672 9,278 8,883 Total current expense 38,801 38,130 35,432 Deferred expense (benefit) Federal (3,080 ) 7,953 153 State (1,417 ) 1,258 (158 ) Total deferred expense (benefit) (4,497 ) 9,211 (5 ) Total expense $ 34,304 $ 47,341 $ 35,427
Schedule of Income Tax Rate Reconciliation	The difference between the statutory federal income tax rate and the effective income tax rate reported for the last three years is detailed below: Years Ended December 31 2018 2017 2016 (Dollars in thousands) Computed statutory federal income tax provision $ 32,744 21.00 % $ 47,091 35.00 % $ 39,226 35.00 % State taxes, net of federal tax benefit 9,633 6.18 % 6,817 5.07 % 5,643 5.03 % Merger and other related costs (non-deductible) 130 0.08 % 213 0.16 % 210 0.19 % Change in valuation allowance 49 0.03 % 31 0.02 % 28 0.02 % Revaluation of net deferred tax assets — — % 1,895 1.41 % — — % New Markets Tax Credits (3,960 ) (2.54 )% (3,960 ) (2.94 )% (6,360 ) (5.67 )% Increase in cash surrender value of life insurance (1,160 ) (0.74 )% (1,445 ) (1.07 )% (1,431 ) (1.28 )% Low Income Housing Project Investments (1,030 ) (0.66 )% (1,253 ) (0.93 )% (1,641 ) (1.46 )% Stock-based compensation (885 ) (0.57 )% (1,258 ) (0.94 )% — — % Nontaxable interest, net (566 ) (0.36 )% (987 ) (0.73 )% (996 ) (0.89 )% Other, net (651 ) (0.42 )% 197 0.15 % 748 0.67 % Total expense $ 34,304 22.00 % $ 47,341 35.20 % $ 35,427 31.61 %
Schedule of Net Deferred Tax Asset	The tax-effected components of the net deferred tax asset at December 31 were as follows: 2018 2017 (Dollars in thousands) Deferred tax assets Accrued expenses not deducted for tax purposes $ 11,922 $ 9,268 Allowance for loan losses 17,764 16,702 Deferred gain on sale leaseback transaction 704 909 Employee and director equity compensation 1,636 1,559 Federal Home Loan Bank borrowings fair value adjustment 15 26 Loan basis difference fair value adjustment 4,761 3,070 Net operating loss carry-forward 170 127 Net unrealized loss on securities available for sale 1,850 106 Other 842 527 Gross deferred tax assets 39,664 32,294 Valuation allowance (170 ) (121 ) Total deferred tax assets net of valuation allowance $ 39,494 $ 32,173 Deferred tax liabilities Core deposit and other intangibles $ 3,803 $ 2,057 Deferred loan fees, net 4,759 4,275 Derivatives fair value adjustment 2,413 524 Fixed assets 5,259 5,270 Goodwill 10,388 10,265 Prepaid pension 3,483 3,056 Other 1,139 1,251 Gross deferred tax liabilities $ 31,244 $ 26,698 Total net deferred tax asset $ 8,250 $ 5,475
Reconciliation of Unrecognized Tax Benefits	The Company accounts for uncertainties in income taxes by providing a tax reserve for certain positions. The following is a reconciliation of the beginning and ending amount of unrecognized tax benefits: (Dollars in thousands) Balance at December 31, 2016 $ 111 Increase for current year tax positions 31 Balance at December 31, 2017 142 Increase for current year tax positions 73 Balance at December 31, 2018 $ 215

LOW INCOME HOUSING PROJECT IN_2

LOW INCOME HOUSING PROJECT INVESTMENTS Low Income Housing Project Investments (Tables)	12 Months Ended
	Dec. 31, 2018
Low Income Housing Project Investments [Abstract]
Investments in Low Income Housing Projects [Table Text Block]	The following table presents certain information related to the Company's investments in low income housing projects as of December 31: 2018 2017 2016 (Dollars in thousands) Original investment value $ 50,232 $ 47,399 $ 47,379 Current recorded investment $ 33,681 $ 35,225 $ 39,606 Unfunded liability obligation $ 3,935 $ 4,536 $ 12,161 Tax credits and benefits earned during the year $ 5,407 $ 5,654 $ 5,366 Amortization of investments during the year (1) $ 4,377 $ 4,402 $ 3,725 Net income tax benefit recognized during the year $ 1,030 $ 1,253 $ 1,641 (1) The 2017 amount is inclusive of $466,000

EMPLOYEE BENEFIT PLANS (Tables)

EMPLOYEE BENEFIT PLANS (Tables)	12 Months Ended
	Dec. 31, 2018
Retirement Benefits [Abstract]
Schedule of Multiemployer Plan	Funding Status FIP/RP Status Surcharge Expiration Minimum EIN/Pension 2018 2017 Pentegra defined benefit plan for financial institutions 13-5645888/333 At least 80 percent At least 80 percent No No N/A $ —
Schedule of Multiemployer Plan Contributions	The Company’s contributions to the Pension Plans were as follows for the periods indicated: Required Contributions - Plan Year Allocation Cash Payment Future period funding 2018-2019 2017-2018 2016-2017 (Dollars in thousands) 2018 $ 2,642 $ 2,000 $ 642 $ — $ — 2017 $ 6,432 $ 5,000 $ — $ 1,432 $ — 2016 $ 6,245 $ 4,000 $ — $ — $ 2,245
Schedule of Supplemental Retirement Expense and Contributions Paid	The following table shows the defined benefit supplemental retirement expense, and the contributions paid to the plans which were used only to pay the current year benefits as of the dates indicated: 2018 2017 2016 (Dollars in thousands) Retirement expense $ 1,683 $ 1,580 $ 1,513 Contributions paid $ 434 $ 367 $ 320
Schedule of Expected Benefit Payments	Expected future benefit payments for the defined benefit supplemental executive retirement plans are presented below: Defined Benefit Supplemental Executive (Dollars in thousands) 2019 $ 482 2020 $ 467 2021 $ 461 2022 $ 454 2023 $ 568 2024-2028 $ 5,940
Schedule of Supplemental Executive Retirement Plans	The following table illustrates the status of the defined benefit supplemental executive retirement plans at December 31 for the years presented: Defined Benefit Supplemental Executive 2018 2017 2016 (Dollars in thousands) Change in accumulated benefit obligation Benefit obligation at beginning of year $ 15,749 $ 14,177 $ 13,290 Service cost 459 423 395 Interest cost 533 547 539 Actuarial loss (gain) (1,344 ) 969 273 Benefits paid (434 ) (367 ) (320 ) Benefit obligation at end of year $ 14,963 $ 15,749 $ 14,177 Change in plan assets Fair value of plan assets at beginning of year $ — $ — $ — Employer contribution 434 367 320 Benefits paid (434 ) (367 ) (320 ) Fair value of plan assets at end of year $ — $ — $ — Funded status at end of year $ (14,963 ) $ (15,749 ) $ (14,177 ) Assets — — — Liabilities (14,963 ) (15,749 ) (14,177 ) Funded status at end of year $ (14,963 ) $ (15,749 ) $ (14,177 ) Amounts recognized in accumulated other comprehensive income (“AOCI”) Net loss $ 1,705 $ 3,465 $ 2,830 Prior service cost 770 1,047 1,323 Amounts recognized in AOCI $ 2,475 $ 4,512 $ 4,153 Information for plans with an accumulated benefit obligation in excess of plan assets Projected benefit obligation $ 14,963 $ 15,749 $ 14,177 Accumulated benefit obligation $ 14,963 $ 15,749 $ 14,177 Net periodic benefit cost Service cost $ 459 $ 423 $ 395 Interest cost 533 547 539 Amortization of prior service cost 276 276 276 Recognized net actuarial loss 415 334 303 Net periodic benefit cost $ 1,683 $ 1,580 $ 1,513 Amounts in accumulated other comprehensive income expected to be recognized in net periodic benefit cost over next fiscal year Net actuarial loss $ 41 $ 415 $ 338 Net prior service cost $ 276 $ 276 $ 276 Discount rate used for benefit obligation 3.24 - 4.09% 2.48-3.45% 2.49-3.94% Discount rate used for net periodic benefit cost 2.48 - 3.45% 2.49-3.94% 2.49-4.16% Rate of compensation increase n/a n/a n/a

FAIR VALUE MEASUREMENTS (Tables

FAIR VALUE MEASUREMENTS (Tables)	12 Months Ended
	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Schedule of Assets and Liabilities Measured at Fair Value on a Recurring and Nonrecurring Basis	Assets and liabilities measured at fair value on a recurring and nonrecurring basis were as follows as of the dates indicated: Fair Value Measurements at Reporting Date Using Balance Quoted Prices in Significant Other Significant December 31, 2018 (Dollars in thousands) Recurring fair value measurements Assets Trading securities $ 1,504 $ 1,504 $ — $ — Equity securities 19,477 19,477 — — Securities available for sale U.S. Government agency securities 32,038 — 32,038 — Agency mortgage-backed securities 220,105 — 220,105 — Agency collateralized mortgage obligations 134,911 — 134,911 — State, county, and municipal securities 1,735 — 1,735 — Single issuer trust preferred securities issued by banks and insurers 707 — 707 — Pooled trust preferred securities issued by banks and insurers 1,329 — — 1,329 Small business administration pooled securities 51,927 — 51,927 — Loans held for sale 6,431 — 6,431 — Derivative instruments 26,310 — 26,310 — Liabilities Derivative instruments 17,523 — 17,523 — Total recurring fair value measurements $ 478,951 $ 20,981 $ 456,641 $ 1,329 Nonrecurring fair value measurements Assets Collateral dependent impaired loans $ 29,109 $ — $ — $ 29,109 Total nonrecurring fair value measurements $ 29,109 $ — $ — $ 29,109 Fair Value Measurements at Reporting Date Using Balance Quoted Prices in Significant Other Significant December 31, 2017 (Dollars in thousands) Recurring fair value measurements Assets Trading securities $ 1,324 $ 1,324 $ — $ — Securities available for sale U.S. Government agency securities 35,430 $ — 35,430 — Agency mortgage-backed securities 215,764 — 215,764 — Agency collateralized mortgage obligations 122,012 — 122,012 — State, county, and municipal securities 2,274 — 2,274 — Single issuer trust preferred securities issued by banks and insurers 2,016 — 2,016 — Pooled trust preferred securities issued by banks and insurers 1,640 — — 1,640 Small business administration pooled securities 47,778 — 47,778 — Equity securities 20,584 20,584 — — Loans held for sale 4,768 — 4,768 — Derivative instruments 17,476 — 17,476 — Liabilities Derivative instruments 15,693 — 15,693 — Total recurring fair value measurements $ 455,373 $ 21,908 $ 431,825 $ 1,640 Nonrecurring fair value measurements: Assets Collateral dependent impaired loans $ 33,567 $ — $ — $ 33,567 Other real estate owned and other foreclosed assets 612 — — 612 Total nonrecurring fair value measurements $ 34,179 $ — $ — $ 34,179
Reconciliation of Assets on Recurring Basis Using Significant Unobservable Inputs	All assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) were valued using pricing models and discounted cash flow methodologies, as of December 31, 2018 , 2017 and 2016 . This reconciliation is presented in the table below, for the periods indicated: 2018 2017 2016 (Dollars in thousands) Pooled Trust Preferred Securities Beginning balance $ 1,640 $ 1,584 $ 1,572 Gain and (losses) (realized/unrealized) Included in earnings — — — Included in other comprehensive income 191 77 29 Settlements (502 ) (21 ) (17 ) Ending Balance $ 1,329 $ 1,640 $ 1,584
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]	The following table sets forth certain unobservable inputs regarding the Company's financial instruments that are classified as Level 3 as of December 31st for the years indicated: Valuation Technique Fair Value Unobservable Inputs Range Weighted Average 2018 2017 2018 2017 2018 2017 (Dollars in thousands) Discounted cash flow methodology Pooled trust preferred securities $ 1,329 $ 1,640 Cumulative prepayment 0% - 59% 0% - 61% 2.1% 2.5% Cumulative default 5% - 100% 5% - 100% 16.2% 12.4% Loss given default 85% - 100% 85% - 100% 94.8% 94.3% Cure given default 0% - 75% 0% - 75% 60.9% 60.9% Appraisals of collateral (1) Collateral dependent impaired loans $ 29,109 $ 33,567 Other real estate owned and foreclosed assets $ — $ 612 (1)
Schedule of Fair Values and Related Carrying Amounts by Balance Sheet Grouping	he estimated fair values and related carrying amounts for assets and liabilities for which fair value is only disclosed are shown below as of the periods indicated: Fair Value Measurements at Reporting Date Using Carrying Value Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) December 31, 2018 (Dollars in thousands) Financial assets Securities held to maturity(a) U.S. Treasury securities $ 1,004 $ 1,015 $ — $ 1,015 $ — Agency mortgage-backed securities 252,484 250,928 — 250,928 — Agency collateralized mortgage obligations 332,775 326,724 — 326,724 — Single issuer trust preferred securities issued by banks 1,500 1,490 — 1,490 — Small business administration pooled securities 23,727 23,483 — 23,483 — Loans, net of allowance for loan losses(b) 6,812,792 6,635,209 — — 6,635,209 Federal Home Loan Bank stock(c) 15,683 15,683 — 15,683 — Cash surrender value of life insurance policies(d) 160,456 160,456 — 160,456 — Financial liabilities Deposit liabilities, other than time deposits(e) $ 6,716,017 $ 6,716,017 $ — $ 6,716,017 $ — Time certificates of deposits(f) 711,103 703,728 — 703,728 $ — Federal Home Loan Bank borrowings(f) 147,806 147,603 — 147,603 — Junior subordinated debentures(g) 76,173 73,827 — 73,827 — Subordinated debentures(f) 34,728 32,509 — — 32,509 Fair Value Measurements at Reporting Date Using Carrying Value Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) December 31, 2017 Financial assets (Dollars in thousands) Securities held to maturity(a) U.S. Treasury securities $ 1,006 $ 1,035 $ — $ 1,035 $ — Agency mortgage-backed securities 204,768 205,823 — 205,823 — Agency collateralized mortgage obligations 262,998 258,408 — 258,408 — Single issuer trust preferred securities issued by banks 1,500 1,529 — 1,529 — Small business administration pooled securities 27,416 27,399 — 27,399 — Loans, net of allowance for loan losses(b) 6,261,343 6,116,051 — — 6,116,051 Federal Home Loan Bank stock(c) 11,597 11,597 — 11,597 — Cash surrender value of life insurance policies(d) 151,528 151,528 — 151,528 — Financial liabilities Deposit liabilities, other than time deposits(e) $ 6,084,952 $ 6,084,952 $ — $ 6,084,952 $ — Time certificates of deposits(f) 644,301 639,060 — 639,060 — Federal Home Loan Bank borrowings(f) 53,264 52,111 — 52,111 — Customer repurchase agreements and other short-term borrowings(f) 162,679 162,679 — — 162,679 Junior subordinated debentures(g) 73,073 74,680 — 74,680 — Subordinated debentures(f) 34,682 32,707 — — 32,707 (a) The fair values presented are based on quoted market prices, where available. If quoted market prices are not available, fair values are based on quoted market prices of comparable instruments and/or discounted cash flow analysis. (b) Fair value is estimated by discounting the future cash flows using the current rates at which similar loans would be made to borrowers with similar credit ratings and for the same remaining maturities or cash flows. Additionally, this amount excludes collateral dependent impaired loans, which are deemed to be marked to fair value on a nonrecurring basis. (c) FHLB stock has no quoted market value and is carried at cost, therefore the carrying amount approximates fair value. (d) Cash surrender value of life insurance is recorded at its cash surrender value (or the amount that can be realized upon surrender of the policy), therefore carrying amount approximates fair value. (e) Fair value of demand deposits, savings and interest checking accounts and money market deposits is the amount payable on demand at the reporting date. (f) Fair value was determined by discounting anticipated future cash payments using rates currently available for instruments with similar remaining maturities. (g)

REVENUE RECOGNITION (Tables)

REVENUE RECOGNITION (Tables)	12 Months Ended
	Dec. 31, 2018
Revenue Recognition [Abstract]
Disaggregation of Revenue [Table Text Block]	The following table presents the revenue streams that the Company has disaggregated as of the periods indicated: Years Ended December 31 2018 2017 2016 (Dollars in thousands) Deposit account fees (inclusive of cash management fees) $ 18,327 $ 17,822 $ 18,652 Interchange fees 15,433 13,899 12,842 ATM fees 2,961 2,938 3,093 Investment management - wealth management and advisory services 23,441 21,644 19,587 Investment management - retail investments and insurance revenue 2,714 2,158 2,222 Merchant processing income 1,401 1,229 1,206 Other noninterest income 4,432 4,569 4,273 Total noninterest income in-scope of ASC 606 68,709 64,259 61,875 Total noninterest income out-of-scope of ASC 606 19,796 18,735 20,553 Total noninterest income $ 88,505 82,994 $ 82,428
Contract with Customer, Asset and Liability [Table Text Block]	The following table provides the amount of investment management revenue earned but not received as of the periods indicated: December 31, 2018 December 31, 2017 (Dollars in thousands) Receivables, included in other assets $ 1,893 $ 1,934

OTHER COMPREHENSIVE LOSS (Table

OTHER COMPREHENSIVE LOSS (Tables)	12 Months Ended
	Dec. 31, 2018
Equity [Abstract]
Schedule of Other Comprehensive Loss	The following table presents a reconciliation of the changes in the components of other comprehensive income (loss) for the dates indicated, including the amount of income tax (expense) benefit allocated to each component of other comprehensive income (loss): December 31, 2018 Pre Tax Tax (Expense) After Tax (Dollars in thousands) Change in fair value of securities available for sale $ (5,923 ) $ 1,422 $ (4,501 ) Less: net security gains reclassified into other noninterest income (expense) — — — Net change in fair value of securities available for sale (5,923 ) 1,422 (4,501 ) Change in fair value of cash flow hedges 7,717 (2,169 ) 5,548 Less: net cash flow hedge gains reclassified into interest income or interest expense (1) 1,000 (281 ) 719 Net change in fair value of cash flow hedges 6,717 (1,888 ) 4,829 Net unamortized gain related to defined benefit pension and other postretirement adjustments arising during the period 1,521 (428 ) 1,093 Amortization of net actuarial losses 372 (105 ) 267 Amortization of net prior service cost 276 (78 ) 198 Net change in other comprehensive income for defined benefit postretirement plans (2) 2,169 (611 ) 1,558 Total other comprehensive income $ 2,963 $ (1,077 ) $ 1,886 Year Ended December 31, 2017 Pre Tax Tax (Expense) After Tax (Dollars in thousands) Change in fair value of securities available for sale $ (996 ) $ 321 $ (675 ) Less: net security gains reclassified into other noninterest income (expense) 3 (1 ) 2 Net change in fair value of securities available for sale (999 ) 322 (677 ) Change in fair value of cash flow hedges 307 (125 ) 182 Less: net cash flow hedge losses reclassified into interest income or interest expense (1) (441 ) 180 (261 ) Net change in fair value of cash flow hedges 748 (305 ) 443 Net unamortized loss related to defined benefit pension and other postretirement adjustments arising during the period (995 ) 407 (588 ) Amortization of net actuarial losses 278 (113 ) 165 Amortization of net prior service cost 276 (113 ) 163 Net change in other comprehensive income for defined benefit postretirement plans (2) (441 ) 181 (260 ) Total other comprehensive loss $ (692 ) $ 198 $ (494 ) Year Ended December 31, 2016 Pre Tax Tax (Expense) After Tax (Dollars in thousands) Change in fair value of securities available for sale $ (1,858 ) $ 710 $ (1,148 ) Less: net security losses reclassified into other noninterest income (expense) (26 ) 11 (15 ) Net change in fair value of securities available for sale (1,832 ) 699 (1,133 ) Change in fair value of cash flow hedges 1,133 (453 ) 680 Less: net cash flow hedge losses reclassified into interest income or interest expense (1) (2,520 ) 1,030 (1,490 ) Net change in fair value of cash flow hedges 3,653 (1,483 ) 2,170 Net unamortized loss related to defined benefit pension and other postretirement adjustments arising during the period (383 ) 157 (226 ) Amortization of net actuarial losses 238 (97 ) 141 Amortization of net prior service cost 276 (113 ) 163 Net change in other comprehensive income for defined benefit postretirement plans (2) 131 (53 ) 78 Total other comprehensive income $ 1,952 $ (837 ) $ 1,115 (1) Includes the amortization of the remaining balance of a realized but unrecognized gain, net of tax, from the termination of interest rate swaps in 2009. The original gain of $1.4 million , net of tax, was recognized in earnings through December 2018 , the original maturity date of the swap. The balance of this gain was fully amortized into earnings at December 31, 2018 . The balance of the gain was amortized to $137,000 , and $281,000 at December 31, 2017 and 2016 , respectively. (2) The amortization of prior service costs is included in the computation of net periodic pension costs as disclosed in Note 15 - Employee Benefit Plans
Schedule of Accumulated Other Comprehensive Income (Loss), Net of Tax	Information on the Company's accumulated other comprehensive income (loss), net of tax, is comprised of the following components as of the periods indicated: Unrealized Gain (Loss) on Securities Unrealized Gain (Loss) on Cash Flow Hedge Deferred Gain on Hedge Transactions Defined Benefit Postretirement Plans Accumulated Other Comprehensive Income (Loss) (Dollars in Thousands) Beginning balance: January 1, 2016 $ 1,306 $ (1,955 ) $ 427 $ (2,230 ) $ (2,452 ) Other comprehensive income (loss) (1,133 ) 2,316 (146 ) 78 1,115 Ending balance: December 31, 2016 $ 173 $ 361 $ 281 $ (2,152 ) $ (1,337 ) Other comprehensive income (loss) (677 ) 587 (144 ) (260 ) (494 ) Ending balance: December 31, 2017 $ (504 ) $ 948 $ 137 $ (2,412 ) $ (1,831 ) Opening balance reclassification (111 ) 205 29 (520 ) (397 ) Cumulative effect accounting adjustment (831 ) — — — (831 ) Other comprehensive income (loss) (4,501 ) 4,995 (166 ) 1,558 1,886 Ending balance: December 31, 2018 $ (5,947 ) $ 6,148 $ — $ (1,374 ) $ (1,173 )

COMMITMENTS AND CONTINGENCIES (

COMMITMENTS AND CONTINGENCIES (Tables)	12 Months Ended
	Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Schedule of Off-Balance Sheet Financial Instruments	The following table summarizes the above financial instruments at the dates indicated: As of December 31 2018 2017 (Dollars in thousands) Commitments to extend credit $ 2,639,689 $ 2,443,478 Standby letters of credit $ 16,708 $ 15,534 Deferred standby letter of credit fees $ 122 $ 102
Schedule of Minimum Future Lease Commitments	The Company leases office space, space for ATM locations, and certain branch locations under noncancelable operating leases. Several of these leases have renewal options that typically range from 5 to 10 years. The following is a schedule of minimum future lease payments under such leases as of December 31, 2018 : (Dollars in thousands) 2019 $ 9,455 2020 9,125 2021 7,617 2022 6,610 2023 4,561 Thereafter 11,556 Total future minimum lease commitments $ 48,924

REGULATORY CAPITAL REQUIREMEN_2

REGULATORY CAPITAL REQUIREMENTS (Tables)	12 Months Ended
	Dec. 31, 2018
Banking and Thrift [Abstract]
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations	The Company’s and the Bank’s actual capital amounts and ratios as of December 31, 2018 and 2017 are also presented in the table that follows: Actual For Capital To Be Well Capitalized Amount Ratio Amount Ratio Amount Ratio December 31, 2018 (Dollars in thousands) Independent Bank Corp. Total capital (to risk weighted assets) $ 992,454 14.45 % $ 549,297 ≥ 8.0 % N/A N/A Common equity tier 1 capital (to risk weighted assets) $ 818,176 11.92 % $ 308,980 ≥ 4.5 % N/A N/A Tier 1 capital (to risk weighted assets) $ 892,176 12.99 % $ 411,973 ≥ 6.0 % N/A N/A Tier 1 capital (to average assets) $ 892,176 10.69 % $ 333,754 ≥ 4.0 % N/A N/A Rockland Trust Company Total capital (to risk weighted assets) $ 937,574 13.66 % $ 549,036 ≥ 8.0 % $ 686,295 ≥ 10.0 % Common equity tier 1 capital (to risk weighted assets) $ 872,024 12.71 % $ 308,833 ≥ 4.5 % $ 446,092 ≥ 6.5 % Tier 1 capital (to risk weighted assets) $ 872,024 12.71 % $ 411,777 ≥ 6.0 % $ 549,036 ≥ 8.0 % Tier 1 capital (to average assets) $ 872,024 10.46 % $ 333,595 ≥ 4.0 % $ 416,994 ≥ 5.0 % December 31, 2017 (Dollars in thousands) Independent Bank Corp. Total capital (to risk weighted assets) $ 886,807 13.82 % $ 513,398 ≥ 8.0 % N/A N/A Common equity tier 1 capital (to risk weighted assets) $ 718,995 11.20 % $ 288,787 ≥ 4.5 % N/A N/A Tier 1 capital (to risk weighted assets) $ 789,992 12.31 % $ 385,049 ≥ 6.0 % N/A N/A Tier 1 capital (to average assets) $ 789,992 10.04 % $ 314,756 ≥ 4.0 % N/A N/A Rockland Trust Company Total capital (to risk weighted assets) $ 846,147 13.19 % $ 513,175 ≥ 8.0 % $ 641,469 ≥ 10.0 % Common equity tier 1 capital (to risk weighted assets) $ 784,014 12.22 % $ 288,661 ≥ 4.5 % $ 416,955 ≥ 6.5 % Tier 1 capital (to risk weighted assets) $ 784,014 12.22 % $ 384,881 ≥ 6.0 % $ 513,175 ≥ 8.0 % Tier 1 capital (to average assets) $ 784,014 9.97 % $ 314,630 ≥ 4.0 % $ 393,288 ≥ 5.0 %

PARENT COMPANY FINANCIALS ONLY

PARENT COMPANY FINANCIALS ONLY (Tables)	12 Months Ended
	Dec. 31, 2018
Condensed Financial Information Disclosure [Abstract]
Schedule of Condensed Balance Sheets	BALANCE SHEETS December 31 2018 2017 (Dollars in thousands) Assets Cash(1) $ 64,256 $ 48,131 Investments in subsidiaries(2) 1,128,407 1,010,125 Prepaid income taxes 1,014 786 Deferred tax asset — 96 Derivative instruments(1) 1,711 1,535 Other assets 37 — Total assets $ 1,195,425 $ 1,060,673 Liabilities and stockholders’ equity Dividends payable $ 10,671 $ 8,786 Junior subordinated debentures 76,173 73,073 Subordinated debentures 34,728 34,682 Other liabilities 363 323 Total liabilities 121,935 116,864 Stockholders’ equity 1,073,490 943,809 Total liabilities and stockholders’ equity $ 1,195,425 $ 1,060,673 (1) Entire balance eliminates in consolidation. (2)
Schedule of Condensed Statements of Income	STATEMENTS OF INCOME Years Ended December 31 2018 2017 2016 (Dollars in thousands) Income Dividends received from subsidiaries(1) $ 71,255 $ 47,006 $ 44,598 Interest income(2) — 50 98 Total income 71,255 47,056 44,696 Expenses Interest expense 4,234 3,995 5,901 Total expenses 4,234 3,995 5,901 Income before income taxes and equity in undistributed income of subsidiaries 67,021 43,061 38,795 Income tax benefit (1,151 ) (1,523 ) (1,791 ) Income of parent company 68,172 44,584 40,586 Equity in undistributed income of subsidiaries 53,450 42,620 36,062 Net income $ 121,622 $ 87,204 $ 76,648 (1) Majority of balance eliminates in consolidation. (2)
Schedule of Condensed Statements of Cash Flows	STATEMENTS OF CASH FLOWS Years Ended December 31 2018 2017 2016 (Dollars in thousands) Cash flows from operating activities Net income $ 121,622 $ 87,204 $ 76,648 Adjustments to reconcile net income to cash provided by operating activities Amortization (accretion) 54 12 (154 ) Deferred income tax expense 49 51 678 Change in prepaid income taxes and other assets 135 (99 ) 423 Change in other liabilities 6 (562 ) (5,532 ) Equity in undistributed income of subsidiaries (53,450 ) (42,620 ) (36,062 ) Net cash provided by operating activities 68,416 43,986 36,001 Cash flows used in investing activities Cash paid for acquisitions, net of cash acquired (1) (13,649 ) (4,834 ) (950 ) Net cash used in investing activities (13,649 ) (4,834 ) (950 ) Cash flows used in financing activities Restricted stock awards issued, net of awards surrendered (1,371 ) (1,422 ) (696 ) Net proceeds from exercise of stock options 184 214 201 Proceeds from shares issued under the direct stock purchase plan 2,712 1,636 2,323 Common dividends paid (40,167 ) (34,045 ) (29,711 ) Net cash used in financing activities (38,642 ) (33,617 ) (27,883 ) Net increase in cash and cash equivalents 16,125 5,535 7,168 Cash and cash equivalents at the beginning of the year 48,131 42,596 35,428 Cash and cash equivalents at the end of the year $ 64,256 $ 48,131 $ 42,596 (1) The majority of the net assets acquired at the parent company represented each of the acquired companies' investments in their wholly owned subsidiaries, which were eliminated in consolidation at December 31, 2018 , 2017 , and 2016

SELECTED QUARTERLY FINANCIAL _2

SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) (Tables)	12 Months Ended
	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Schedule of Quarterly Financial Information	First Quarter Second Quarter Third Quarter Fourth Quarter 2018 2017 2018 2017 2018 2017 2018 2017 (Dollars in thousands, except per share data) Interest income $ 73,749 $ 64,407 $ 79,167 $ 68,133 $ 82,875 $ 71,778 $ 87,910 $ 72,876 Interest expense 5,278 4,207 5,999 4,378 6,641 4,705 7,618 5,044 Net interest income 68,471 60,200 73,168 63,755 76,234 67,073 80,292 67,832 Provision for loan losses 500 600 2,000 1,050 1,075 — 1,200 1,300 Total noninterest income 19,863 18,912 21,887 21,398 23,264 20,770 23,491 21,914 Total noninterest expenses 53,451 48,773 52,688 52,809 55,439 51,310 64,391 51,467 Provision for income taxes 6,828 9,014 9,249 10,731 9,969 12,681 8,258 14,915 Net income $ 27,555 $ 20,725 $ 31,118 $ 20,563 $ 33,015 $ 23,852 $ 29,934 $ 22,064 Basic earnings per share $ 1.00 $ 0.77 $ 1.13 $ 0.75 $ 1.20 $ 0.87 $ 1.08 $ 0.80 Diluted earnings per share $ 1.00 $ 0.76 $ 1.13 $ 0.75 $ 1.20 $ 0.87 $ 1.07 $ 0.80 Weighted average common shares (basic) 27,486,573 27,029,640 27,526,653 27,257,799 27,537,841 27,436,792 27,815,437 27,445,739 Common stock equivalents 67,381 81,283 54,525 74,497 63,499 76,307 58,576 77,615 Weighted average common shares (diluted) 27,553,954 27,110,923 27,581,178 27,332,296 27,601,340 27,513,099 27,874,013 27,523,354 Unusual or infrequently occurring items Items within noninterest expense Merger and acquisition expense $ — $ 484 $ 434 $ 2,909 $ 2,688 $ — $ 8,046 $ — Items within provision for income taxes 2017 Tax Act: revaluation of net deferred tax assets $ — $ — $ — $ — $ — $ — $ — $ 1,895 2017 Tax Act: revaluation of LIHTC investments $ — $ — $ — $ — $ — $ — $ — $ 466 Total unusual or infrequently occurring items $ — $ 484 $ 434 $ 2,909 $ 2,688 $ — $ 8,046 $ 2,361

TRANSACTIONS WITH RELATED PAR_2

TRANSACTIONS WITH RELATED PARTIES Activity of Loans to Related Parties (Tables)	12 Months Ended
	Dec. 31, 2018
Related Party Transaction [Line Items]
Schedule of Related Party Transactions [Table Text Block]	The following information represents annual activity of loans to related parties for the periods indicated: 2018 2017 (Dollars in thousands) Principal balance of loans outstanding at beginning of year $ 52,458 $ 22,795 Loan advances (1) 14,862 36,800 Loan payments/payoffs (14,057 ) (7,137 ) Reduction for retired directors (12,093 ) — Principal balance of loans outstanding at end of year $ 41,170 $ 52,458 1. The 2017 amount includes $31.3 million

SUMMARY OF SIGNIFICANT ACCOUN_4

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)	12 Months Ended
	Dec. 31, 2018
Core Deposits [Member]
Finite-Lived Intangible Assets [Line Items]
Useful life	10 years
Noncompete Agreements [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Useful life	1 year
Noncompete Agreements [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Useful life	3 years
Customer Lists [Member]
Finite-Lived Intangible Assets [Line Items]
Useful life	12 years
Lease Agreements [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Useful life	3 years
Lease Agreements [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Useful life	30 years

SUMMARY OF SIGNIFICANT ACCOUN_5

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details Textual)	12 Months Ended
	Dec. 31, 2018USD ($)centerbranch	Dec. 31, 2017USD ($)
Accounting Policies [Line Items]
Reserve for unfunded loan commitments | $	$ 1,300,000	$ 972,000
Maximum [Member]
Accounting Policies [Line Items]
Lease Option Period	15 years
Loans Receivable [Member] | Lender Concentration Risk [Member] | Residential Building [Member]
Accounting Policies [Line Items]
Loans of nonresidential buildings to total loan portfolio	15.10%	15.40%
Full Service Retail Branch [Member] | Bank [Member]
Accounting Policies [Line Items]
Number of branches | branch	87
Limited Service Retail Branch [Member] | Bank [Member]
Accounting Policies [Line Items]
Number of branches | branch	2
Commercial Banking Center [Member] | Bank [Member]
Accounting Policies [Line Items]
Number of centers	13
Investment Management Office [Member] | Bank [Member]
Accounting Policies [Line Items]
Number of centers	8
Mortgage Lending Center [Member] | Bank [Member]
Accounting Policies [Line Items]
Number of centers	1

ACQUISITIONS (Details)

ACQUISITIONS (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Nov. 16, 2018	Dec. 31, 2017	May 12, 2017	Dec. 31, 2016
Assets
Goodwill	$ 256,105		$ 231,806		$ 221,526
Island Bancorp, Inc. [Member]
Assets
Cash				$ 11,137
Loans				155,551
Premises and equipment				5,828
Goodwill				10,280
Core deposit intangible				2,964
Other assets				4,629
Total assets acquired				190,389
Liabilities
Deposits				159,580
Borrowings				2,475
Other liabilities				18
Total liabilities assumed				162,073
Purchase price				$ 28,316
MNB Bancorp [Member]
Assets
Cash		$ 6,743
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Investments		25,358
Loans		293,498
Premises and equipment		1,904
Goodwill		24,299
Core deposit intangible		8,588
Other assets		8,639
Total assets acquired		369,029
Liabilities
Deposits		278,204
Borrowings		33,093
Other liabilities		1,609
Total liabilities assumed		312,906
Purchase price		$ 56,123

ACQUISITIONS (Details 2)

ACQUISITIONS (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Island Bancorp, Inc. [Member]
Business Acquisition [Line Items]
Net interest income after provision for loan losses	$ 258,017	$ 227,429
Net income	90,025	78,150
MNB Bancorp [Member]
Business Acquisition [Line Items]
Net interest income after provision for loan losses	304,049	267,104
Net income	$ 129,797	$ 88,518

ACQUISITIONS (Details Textual)

ACQUISITIONS (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	Nov. 16, 2018	May 12, 2017	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Acquisition Related Costs			$ 8,046	$ 2,688	$ 434	$ 0	$ 0	$ 2,909	$ 484	$ 11,168	$ 3,393	$ 5,455
Blue Hills Bancorp, Inc. [Member]
Business Acquisition [Line Items]
Equity Interest Issued or Issuable Shareholders Option To Receive, Cash Per Share			$ 5.25							$ 5.25
Number of shares of company stock issued for each share of Central common stock (in shares)			0.2308							0.2308
MNB Bancorp [Member]
Business Acquisition [Line Items]
Equity Interest Issued or Issuable Shareholders Option To Receive, Cash Per Share	$ 275
Number of shares of company stock issued for each share of Central common stock (in shares)	3.55
Value of shares of company stock issued for each share of acquiree stock (in dollars per share)	$ 285.38
Company's closing price per share (in dollars per share)	$ 80.39
Business transaction value	$ 56,100
Cost of acquired entity, percentage cash	25.00%
Business Acquisition, Cost of Acquired Entity, Percentage Stock Consideration	75.00%
Cost of acquired entity, cash paid	$ 13,600
Consideration Transferred, Equity Interests Issued and Issuable	$ 42,500
Increase in acquirer outstanding shares	528,353
Acquisition Related Costs										$ 8,800
Loans acquired	$ 293,498
Combination of INDB and MNB Bancorp [Member]
Business Acquisition [Line Items]
Acquisition Related Costs										$ 7,500
Island Bancorp, Inc. [Member]
Business Acquisition [Line Items]
Equity Interest Issued or Issuable Shareholders Option To Receive, Cash Per Share		$ 500
Number of shares of company stock issued for each share of Central common stock (in shares)		9.525
Value of shares of company stock issued for each share of acquiree stock (in dollars per share)		$ 605.31
Company's closing price per share (in dollars per share)		$ 63.55
Business transaction value		$ 28,300
Cost of acquired entity, percentage cash		20.00%
Business Acquisition, Cost of Acquired Entity, Percentage Stock Consideration		80.00%
Cost of acquired entity, cash paid		$ 4,800
Consideration Transferred, Equity Interests Issued and Issuable		$ 23,500
Increase in acquirer outstanding shares		369,286
Acquisition Related Costs											3,200
Loans acquired		$ 155,551
Combination of INDB and Island Bancorp, Inc. [Member]
Business Acquisition [Line Items]
Acquisition Related Costs											$ 2,600

SECURITIES Equity Securities Ga

SECURITIES Equity Securities Gain Loss (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)
Investments, Debt and Equity Securities [Abstract]
Equity Securities, FV-NI, Gain (Loss) [Abstract]	$ (1,225)
Equity Securities, FV-NI, Realized Gain (Loss)	874
Equity Securities, FV-NI, Unrealized Gain (Loss)	$ (2,099)

Available for Sale and Held to

Available for Sale and Held to Maturity securities (Details 1) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Debt Securities, Available-for-sale and Held-to-maturity	$ 1,046,392	$ 941,692
Available-for-sale Securities:
Amortized Cost	450,548	448,219
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax	1,233	3,740
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(9,029)	(4,461)
Equity Securities, FV-NI	442,752	447,498
Debt Securities, Available-for-sale, Amortized Cost	450,548
Amortized Cost	611,490	497,688
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	2,533	2,429
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(10,383)	(5,923)
Fair Value	603,640	494,194
Available for Sale Securities and Held to Maturity Securities Amortized Cost	1,062,038	945,907
Available for Sale Securities and Held to Maturity Securities Gross Unrealized Gains	3,766	6,169
Available for Sale Securities and Held to Maturity Securities Gross Unrealized Losses	(19,412)	(10,384)
U.S. Government agency securities
Available-for-sale Securities:
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax		86
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(439)	(131)
Equity Securities, FV-NI	32,038	35,430
Debt Securities, Available-for-sale, Amortized Cost	32,477	35,475
U.S. treasury securities [Member]
Available-for-sale Securities:
Amortized Cost	1,004	1,006
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	11	29
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0	0
Fair Value	1,015	1,035
Agency mortgage-backed securities [Member]
Available-for-sale Securities:
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	1,020	1,897
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(3,406)	(1,067)
Equity Securities, FV-NI	220,105	215,764
Debt Securities, Available-for-sale, Amortized Cost	222,491	214,934
Amortized Cost	252,484	204,768
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	1,548	1,791
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(3,104)	(736)
Fair Value	250,928	205,823
Agency collateralized mortgage obligations [Member]
Available-for-sale Securities:
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	197	78
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(3,435)	(2,164)
Equity Securities, FV-NI	134,911	122,012
Debt Securities, Available-for-sale, Amortized Cost	138,149	124,098
Amortized Cost	332,775	262,998
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	869	397
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(6,920)	(4,987)
Fair Value	326,724	258,408
State, county, and municipal securities [Member]
Available-for-sale Securities:
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	16	37
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0	0
Equity Securities, FV-NI	1,735	2,274
Debt Securities, Available-for-sale, Amortized Cost	1,719	2,237
Amortized Cost	0
Fair Value	0
Single issuer trust preferred securities issued by banks [Member]
Available-for-sale Securities:
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax		4
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(10)	0
Equity Securities, FV-NI	707	2,016
Debt Securities, Available-for-sale, Amortized Cost	717	2,012
Amortized Cost	1,500	1,500
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	0	29
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(10)	0
Fair Value	1,490	1,529
Pooled trust preferred securities issued by banks and insurers
Available-for-sale Securities:
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(349)	(539)
Equity Securities, FV-NI	1,329	1,640
Debt Securities, Available-for-sale, Amortized Cost	1,678	2,179
Small Business Administration Pooled Securities [Member]
Available-for-sale Securities:
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0	44
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(1,390)	(118)
Equity Securities, FV-NI	51,927	47,778
Debt Securities, Available-for-sale, Amortized Cost	53,317	47,852
Amortized Cost	23,727	27,416
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	105	183
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(349)	(200)
Fair Value	23,483	27,399
Marketable securities [Member]
Available-for-sale Securities:
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax		1,594
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0	(442)
Equity Securities, FV-NI	0	20,584
Debt Securities, Available-for-sale, Amortized Cost	$ 0	$ 19,432

Contractural maturities (Detail

Contractural maturities (Details 3) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Available for Sale, Fair Value
Debt Securities, Available-for-sale, Amortized Cost	$ 450,548
Debt Securities, Available-for-sale	442,752	$ 447,498
Held to Maturity, Amortized Cost
Amortized Cost	611,490	497,688
Held to Maturity, Fair Value
Fair Value	603,640	494,194
U.S. Government agency securities
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Due in one year or less	0
Due after one year to five years	20,010
Due after five to ten years	12,467
Due after ten years	0
Available for Sale, Fair Value
Due in one year or less	0
Due in one year or less	19,903
Due after five to ten years	12,135
Due after ten years	0
Debt Securities, Available-for-sale, Amortized Cost	32,477	35,475
Debt Securities, Available-for-sale	32,038	35,430
Debt Securities [Member]
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Due in one year or less	89
Due after one year to five years	73,232
Due after five to ten years	102,824
Due after ten years	274,403
Available for Sale, Fair Value
Due in one year or less	90
Due in one year or less	72,435
Due after five to ten years	101,501
Due after ten years	268,726
Securities - available for sale	442,752
Held to Maturity, Amortized Cost
Due in one year or less	0
Due after one year to five years	13,102
Due after five to ten years	37,938
Due after ten years	560,450
Held to Maturity, Fair Value
Due in one year or less	0
Due after one year to five years	12,981
Due after five to ten years	37,532
Due after ten years	553,127
Fair Value	603,640
US Treasury Securities [Member]
Held to Maturity, Amortized Cost
Due in one year or less	0
Due after one year to five years	1,004
Due after five to ten years	0
Due after ten years	0
Amortized Cost	1,004	1,006
Held to Maturity, Fair Value
Due in one year or less	0
Due after one year to five years	1,015
Due after five to ten years	0
Due after ten years	0
Fair Value	1,015	1,035
Agency mortgage-backed securities
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Due in one year or less	89
Due after one year to five years	52,452
Due after five to ten years	89,408
Due after ten years	80,542
Available for Sale, Fair Value
Due in one year or less	90
Due in one year or less	51,761
Due after five to ten years	88,402
Due after ten years	79,852
Debt Securities, Available-for-sale, Amortized Cost	222,491	214,934
Debt Securities, Available-for-sale	220,105	215,764
Held to Maturity, Amortized Cost
Due in one year or less	0
Due after one year to five years	12,098
Due after five to ten years	35,703
Due after ten years	204,683
Amortized Cost	252,484	204,768
Held to Maturity, Fair Value
Due in one year or less	0
Due after one year to five years	11,966
Due after five to ten years	35,310
Due after ten years	203,652
Fair Value	250,928	205,823
Agency collateralized mortgage obligations [Member]
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Due in one year or less	0
Due after one year to five years	0
Due after five to ten years	0
Due after ten years	138,149
Available for Sale, Fair Value
Due in one year or less	0
Due in one year or less	0
Due after five to ten years	0
Due after ten years	134,911
Debt Securities, Available-for-sale, Amortized Cost	138,149	124,098
Debt Securities, Available-for-sale	134,911	122,012
Held to Maturity, Amortized Cost
Due in one year or less	0
Due after one year to five years	0
Due after five to ten years	735
Due after ten years	332,040
Amortized Cost	332,775	262,998
Held to Maturity, Fair Value
Due in one year or less	0
Due after one year to five years	0
Due after five to ten years	732
Due after ten years	325,992
Fair Value	326,724	258,408
US States and Political Subdivisions Debt Securities [Member]
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Due in one year or less	0
Due after one year to five years	770
Due after five to ten years	949
Due after ten years	0
Available for Sale, Fair Value
Due in one year or less	0
Due in one year or less	771
Due after five to ten years	964
Due after ten years	0
Debt Securities, Available-for-sale, Amortized Cost	1,719	2,237
Debt Securities, Available-for-sale	1,735	2,274
Held to Maturity, Amortized Cost
Due in one year or less	0
Due after one year to five years	0
Due after five to ten years	0
Due after ten years	0
Amortized Cost	0
Held to Maturity, Fair Value
Due in one year or less	0
Due after one year to five years	0
Due after five to ten years	0
Due after ten years	0
Fair Value	0
Single issuer trust preferred securities issued by banks [Member]
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Due in one year or less	0
Due after one year to five years	0
Due after five to ten years	0
Due after ten years	717
Available for Sale, Fair Value
Due in one year or less	0
Due in one year or less	0
Due after five to ten years	0
Due after ten years	707
Debt Securities, Available-for-sale, Amortized Cost	717	2,012
Debt Securities, Available-for-sale	707	2,016
Held to Maturity, Amortized Cost
Due in one year or less	0
Due after one year to five years	0
Due after five to ten years	1,500
Due after ten years	0
Amortized Cost	1,500	1,500
Held to Maturity, Fair Value
Due in one year or less	0
Due after one year to five years	0
Due after five to ten years	1,490
Due after ten years	0
Fair Value	1,490	1,529
Pooled Trust Preferred Securities Issued By Banks And Insurers [Member]
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Due in one year or less	0
Due after one year to five years	0
Due after five to ten years	0
Due after ten years	1,678
Available for Sale, Fair Value
Due in one year or less	0
Due in one year or less	0
Due after five to ten years	0
Due after ten years	1,329
Debt Securities, Available-for-sale, Amortized Cost	1,678	2,179
Debt Securities, Available-for-sale	1,329	1,640
Small Business Administration Pooled Securities [Member]
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Due in one year or less	0
Due after one year to five years	0
Due after five to ten years	0
Due after ten years	53,317
Available for Sale, Fair Value
Due in one year or less	0
Due in one year or less	0
Due after five to ten years	0
Due after ten years	51,927
Debt Securities, Available-for-sale, Amortized Cost	53,317	47,852
Debt Securities, Available-for-sale	51,927	47,778
Held to Maturity, Amortized Cost
Due in one year or less	0
Due after one year to five years	0
Due after five to ten years	0
Due after ten years	23,727
Amortized Cost	23,727	27,416
Held to Maturity, Fair Value
Due in one year or less	0
Due after one year to five years	0
Due after five to ten years	0
Due after ten years	23,483
Fair Value	$ 23,483	$ 27,399

Unrealized Losses (Details 4)

Unrealized Losses (Details 4) $ in Thousands	Dec. 31, 2018USD ($)holding	Dec. 31, 2017USD ($)holding
Summary of gross unrealized losses and fair value of investments
No of holdings | holding	205	163
Fair value, less than 12 months	$ 202,901	$ 475,739
Fair value, 12 months or longer	566,107	193,298
Fair value, Total	769,008	669,037
Unrealized losses, Total	(19,412)	(10,384)
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for less than 12 months	(2,486)	(3,465)
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for more than 12 months	$ (16,926)	$ (6,919)
US Government Agencies Debt Securities [Member]
Summary of gross unrealized losses and fair value of investments
No of holdings | holding	3	4
Fair value, less than 12 months	$ 9,960	$ 24,343
Fair value, 12 months or longer	22,078	0
Fair value, Total	32,038	24,343
Unrealized losses, Total	(439)	(131)
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for less than 12 months	(43)	(131)
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for more than 12 months	$ (396)	$ 0
Agency mortgage-backed securities [Member]
Summary of gross unrealized losses and fair value of investments
No of holdings | holding	144	84
Fair value, less than 12 months	$ 104,616	$ 235,411
Fair value, 12 months or longer	222,850	14,886
Fair value, Total	327,466	250,297
Unrealized losses, Total	(6,510)	(1,803)
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for less than 12 months	(1,363)	(1,493)
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for more than 12 months	$ (5,147)	$ (310)
Agency collateralized mortgage obligations [Member]
Summary of gross unrealized losses and fair value of investments
No of holdings | holding	48	42
Fair value, less than 12 months	$ 57,871	$ 178,142
Fair value, 12 months or longer	279,229	159,506
Fair value, Total	337,100	337,648
Unrealized losses, Total	(10,355)	(7,151)
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for less than 12 months	(398)	(1,579)
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for more than 12 months	$ (9,957)	$ (5,572)
Single issuer trust preferred securities issued by banks and insurers
Summary of gross unrealized losses and fair value of investments
No of holdings | holding	2
Fair value, less than 12 months	$ 2,197
Fair value, 12 months or longer	0
Fair value, Total	2,197
Unrealized losses, Total	(20)
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for less than 12 months	(20)
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for more than 12 months	$ 0
Pooled trust preferred securities issued by banks and insurers
Summary of gross unrealized losses and fair value of investments
No of holdings | holding	1	1
Fair value, less than 12 months	$ 0	$ 0
Fair value, 12 months or longer	1,329	1,640
Fair value, Total	1,329	1,640
Unrealized losses, Total	(349)	(539)
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for less than 12 months	0	0
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for more than 12 months	$ (349)	$ (539)
Small Business Administration Pooled Securities [Member]
Summary of gross unrealized losses and fair value of investments
No of holdings | holding	7	4
Fair value, less than 12 months	$ 28,257	$ 34,553
Fair value, 12 months or longer	40,621	9,647
Fair value, Total	68,878	44,200
Unrealized losses, Total	(1,739)	(318)
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for less than 12 months	(662)	(223)
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for more than 12 months	$ (1,077)	$ (95)
Marketable securities [Member]
Summary of gross unrealized losses and fair value of investments
No of holdings | holding		28
Fair value, less than 12 months		$ 3,290
Fair value, 12 months or longer		7,619
Fair value, Total		10,909
Unrealized losses, Total		(442)
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for less than 12 months		(39)
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for more than 12 months		$ (403)

SECURITIES (Details Textual)

SECURITIES (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Debt Securities, Trading	$ 1,500,000	$ 1,300,000
Equity Securities, FV-NI	19,477,000	0
Investments in obligations of individual states, counties or municipalities which exceed 10% of equity	0	0
Debt Securities, Available-for-sale	442,752,000	447,498,000
Callable securities in investment portfolio	5,300,000
Investment securities pledged	361,100,000	547,200,000
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Period Increase (Decrease)	0	0	$ 0
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held	0	0	$ 0
Marketable securities [Member]
Debt Securities, Available-for-sale	$ 0	$ 20,584,000

Allowance Allocations (Details)

Allowance Allocations (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				$ 60,643				$ 61,566	$ 60,643	$ 61,566	$ 55,825
Charge-offs									(2,597)	(6,209)	(3,472)
Recoveries									1,472	2,336	3,138
Provision (benefit)	$ 1,200	$ 1,075	$ 2,000	500	$ 1,300	$ 0	$ 1,050	600	4,775	2,950	6,075
Ending balance	64,293				60,643				64,293	60,643	61,566
Ending balance: collectively evaluated for impairment	63,214				59,301				63,214	59,301	56,352
Ending balance: individually evaluated for impairment	1,079				1,342				1,079	1,342	5,214
Financing receivables ending balance:
Financing Receivable, Collectively Evaluated for Impairment	6,838,339				6,269,729				6,838,339	6,269,729	5,903,916
Individually evaluated for impairment	59,060				72,801				59,060	72,801	77,297
Financing Receivable, Net	4,874,718				4,539,256				4,874,718	4,539,256
Total loans	6,906,194				6,355,553				6,906,194	6,355,553	5,999,605	[1]
Commercial and Industrial [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				13,256				16,921	13,256	16,921	13,802
Charge-offs									(355)	(3,891)	(593)
Recoveries									182	615	859
Provision (benefit)									2,677	(389)	2,853
Ending balance	15,760				13,256				15,760	13,256	16,921
Ending balance: collectively evaluated for impairment	15,753				13,246				15,753	13,246	13,260
Ending balance: individually evaluated for impairment	7				10				7	10	3,661
Financing receivables ending balance:
Financing Receivable, Collectively Evaluated for Impairment	1,064,800				853,885				1,064,800	853,885	862,875
Individually evaluated for impairment	28,829				34,643				28,829	34,643	39,178
Financing Receivable, Net	1,093,629				888,528				1,093,629	888,528
Total loans	1,093,629				888,528				1,093,629	888,528	902,053
Commercial Real Estate [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				31,453				30,369	31,453	30,369	27,327
Charge-offs									(82)	(39)	(414)
Recoveries									188	385	564
Provision (benefit)									811	738	2,892
Ending balance	32,370				31,453				32,370	31,453	30,369
Ending balance: collectively evaluated for impairment	32,333				31,411				32,333	31,411	30,173
Ending balance: individually evaluated for impairment	37				42				37	42	196
Financing receivables ending balance:
Financing Receivable, Collectively Evaluated for Impairment	3,235,418				3,093,945				3,235,418	3,093,945	2,983,642
Individually evaluated for impairment	10,839				16,638				10,839	16,638	16,813
Financing Receivable, Net	3,251,248				3,116,561				3,251,248	3,116,561
Total loans	3,251,248				3,116,561				3,251,248	3,116,561	3,010,798
Construction Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				5,698				4,522	5,698	4,522	5,366
Charge-offs									0	0	0
Recoveries									0	0	0
Provision (benefit)									(540)	1,176	(844)
Ending balance	5,158				5,698				5,158	5,698	4,522
Ending balance: collectively evaluated for impairment	5,158				5,698				5,158	5,698	4,522
Ending balance: individually evaluated for impairment	0				0				0	0	0
Financing receivables ending balance:
Financing Receivable, Collectively Evaluated for Impairment	365,165				401,797				365,165	401,797	320,391
Individually evaluated for impairment	0				0				0	0	0
Financing Receivable, Net	365,165				401,797				365,165	401,797
Total loans	365,165				401,797				365,165	401,797	320,391
Small Business [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				1,577				1,502	1,577	1,502	1,264
Charge-offs									(372)	(302)	(228)
Recoveries									46	114	195
Provision (benefit)									505	263	271
Ending balance	1,756				1,577				1,756	1,577	1,502
Ending balance: collectively evaluated for impairment	1,755				1,576				1,755	1,576	1,494
Ending balance: individually evaluated for impairment	1				1				1	1	8
Financing receivables ending balance:
Financing Receivable, Collectively Evaluated for Impairment	164,135				131,667				164,135	131,667	121,855
Individually evaluated for impairment	541				703				541	703	871
Financing Receivable, Net	164,676				132,370				164,676	132,370
Total loans	164,676				132,370				164,676	132,370	122,726
Residential Real Estate [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				2,822				2,621	2,822	2,621	2,590
Charge-offs									(148)	(207)	(28)
Recoveries									12	31	299
Provision (benefit)									533	377	(240)
Ending balance	3,219				2,822				3,219	2,822	2,621
Ending balance: collectively evaluated for impairment	2,357				1,815				2,357	1,815	1,535
Ending balance: individually evaluated for impairment	862				1,007				862	1,007	1,086
Financing receivables ending balance:
Financing Receivable, Collectively Evaluated for Impairment	906,959				733,809				906,959	733,809	622,392
Individually evaluated for impairment	12,706				13,684				12,706	13,684	14,175
Total loans	923,294				754,329				923,294	754,329	644,426
Home Equity [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				5,390				5,238	5,390	5,238	4,889
Charge-offs									(293)	(276)	(602)
Recoveries									156	198	141
Provision (benefit)									355	230	810
Ending balance	5,608				5,390				5,608	5,390	5,238
Ending balance: collectively evaluated for impairment	5,444				5,125				5,444	5,125	4,996
Ending balance: individually evaluated for impairment	164				265				164	265	242
Financing receivables ending balance:
Financing Receivable, Collectively Evaluated for Impairment	1,085,961				1,045,053				1,085,961	1,045,053	982,095
Individually evaluated for impairment	5,948				6,826				5,948	6,826	5,863
Total loans	1,092,084				1,052,088				1,092,084	1,052,088	988,147
Consumer Portfolio Segment [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				$ 447				$ 393	447	393	587
Charge-offs									(1,347)	(1,494)	(1,607)
Recoveries									888	993	1,080
Provision (benefit)									434	555	333
Ending balance	422				447				422	447	393
Ending balance: collectively evaluated for impairment	414				430				414	430	372
Ending balance: individually evaluated for impairment	8				17				8	17	21
Financing receivables ending balance:
Financing Receivable, Collectively Evaluated for Impairment	15,901				9,573				15,901	9,573	10,666
Individually evaluated for impairment	197				307				197	307	397
Total loans	16,098				9,880				16,098	9,880	11,064
Financial Asset Acquired with Credit Deterioration [Member]
Financing receivables ending balance:
Financing Receivable, Net	8,795				13,023				8,795	13,023	18,392
Financial Asset Acquired with Credit Deterioration [Member] | Commercial and Industrial [Member]
Financing receivables ending balance:
Financing Receivable, Net	0				0				0	0	0
Financial Asset Acquired with Credit Deterioration [Member] | Commercial Real Estate [Member]
Financing receivables ending balance:
Financing Receivable, Net	4,991				5,978				4,991	5,978	10,343
Financial Asset Acquired with Credit Deterioration [Member] | Construction Loans [Member]
Financing receivables ending balance:
Financing Receivable, Net	0				0				0	0	0
Financial Asset Acquired with Credit Deterioration [Member] | Small Business [Member]
Financing receivables ending balance:
Financing Receivable, Net	0				0				0	0	0
Financial Asset Acquired with Credit Deterioration [Member] | Residential Real Estate [Member]
Financing receivables ending balance:
Financing Receivable, Net	3,629				6,836				3,629	6,836	7,859
Financial Asset Acquired with Credit Deterioration [Member] | Home Equity [Member]
Financing receivables ending balance:
Financing Receivable, Net	175				209				175	209	189
Financial Asset Acquired with Credit Deterioration [Member] | Consumer Portfolio Segment [Member]
Financing receivables ending balance:
Financing Receivable, Net	$ 0				$ 0				$ 0	$ 0	$ 1
[1]	The amount of net deferred costs on originated loans included in the ending balance was $7.1 million , $6.1 million and $5.1 million at December 31, 2018 , 2017 and 2016 , respectively. Net unamortized discounts on acquired loans not deemed to be PCI included in the ending balance were $15.2 million , $9.4 million and $8.6 million at December 31, 2018 , 2017 and 2016

Internal Risk Rating Categories

Internal Risk Rating Categories for Commercial Portfolio (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Internal risk-rating categories for the Company's commercial portfolio
Financing Receivable, Net	$ 4,874,718	$ 4,539,256
Commercial and Industrial [Member]
Internal risk-rating categories for the Company's commercial portfolio
Financing Receivable, Net	1,093,629	888,528
Commercial Real Estate [Member]
Internal risk-rating categories for the Company's commercial portfolio
Financing Receivable, Net	3,251,248	3,116,561
Construction Loans [Member]
Internal risk-rating categories for the Company's commercial portfolio
Financing Receivable, Net	365,165	401,797
Small Business [Member]
Internal risk-rating categories for the Company's commercial portfolio
Financing Receivable, Net	164,676	132,370
Pass [Member]
Internal risk-rating categories for the Company's commercial portfolio
Financing Receivable, Net	4,695,094	4,345,232
Pass [Member] | Commercial and Industrial [Member]
Internal risk-rating categories for the Company's commercial portfolio
Financing Receivable, Net	1,014,370	806,331
Pass [Member] | Commercial Real Estate [Member]
Internal risk-rating categories for the Company's commercial portfolio
Financing Receivable, Net	3,156,989	3,007,672
Pass [Member] | Construction Loans [Member]
Internal risk-rating categories for the Company's commercial portfolio
Financing Receivable, Net	361,884	400,964
Pass [Member] | Small Business [Member]
Internal risk-rating categories for the Company's commercial portfolio
Financing Receivable, Net	161,851	130,265
Potential weakness [Member]
Internal risk-rating categories for the Company's commercial portfolio
Financing Receivable, Net	74,886	87,822
Potential weakness [Member] | Commercial and Industrial [Member]
Internal risk-rating categories for the Company's commercial portfolio
Financing Receivable, Net	16,860	16,563
Potential weakness [Member] | Commercial Real Estate [Member]
Internal risk-rating categories for the Company's commercial portfolio
Financing Receivable, Net	56,840	69,788
Potential weakness [Member] | Construction Loans [Member]
Internal risk-rating categories for the Company's commercial portfolio
Financing Receivable, Net	298	0
Potential weakness [Member] | Small Business [Member]
Internal risk-rating categories for the Company's commercial portfolio
Financing Receivable, Net	888	1,471
Definite weakness [Member]
Internal risk-rating categories for the Company's commercial portfolio
Financing Receivable, Net	101,248	99,516
Definite weakness [Member] | Commercial and Industrial [Member]
Internal risk-rating categories for the Company's commercial portfolio
Financing Receivable, Net	58,909	59,415
Definite weakness [Member] | Commercial Real Estate [Member]
Internal risk-rating categories for the Company's commercial portfolio
Financing Receivable, Net	37,419	38,637
Definite weakness [Member] | Construction Loans [Member]
Internal risk-rating categories for the Company's commercial portfolio
Financing Receivable, Net	2,983	833
Definite weakness [Member] | Small Business [Member]
Internal risk-rating categories for the Company's commercial portfolio
Financing Receivable, Net	1,937	631
Parital loss probable [Member]
Internal risk-rating categories for the Company's commercial portfolio
Financing Receivable, Net	3,490	6,686
Parital loss probable [Member] | Commercial and Industrial [Member]
Internal risk-rating categories for the Company's commercial portfolio
Financing Receivable, Net	3,490	6,219
Parital loss probable [Member] | Commercial Real Estate [Member]
Internal risk-rating categories for the Company's commercial portfolio
Financing Receivable, Net	0	464
Parital loss probable [Member] | Construction Loans [Member]
Internal risk-rating categories for the Company's commercial portfolio
Financing Receivable, Net	0	0
Parital loss probable [Member] | Small Business [Member]
Internal risk-rating categories for the Company's commercial portfolio
Financing Receivable, Net	0	3
Definite loss [Member]
Internal risk-rating categories for the Company's commercial portfolio
Financing Receivable, Net	0	0
Definite loss [Member] | Commercial and Industrial [Member]
Internal risk-rating categories for the Company's commercial portfolio
Financing Receivable, Net	0	0
Definite loss [Member] | Commercial Real Estate [Member]
Internal risk-rating categories for the Company's commercial portfolio
Financing Receivable, Net	0	0
Definite loss [Member] | Construction Loans [Member]
Internal risk-rating categories for the Company's commercial portfolio
Financing Receivable, Net	0	0
Definite loss [Member] | Small Business [Member]
Internal risk-rating categories for the Company's commercial portfolio
Financing Receivable, Net	$ 0	$ 0

Weighted Average FICO Scores &

Weighted Average FICO Scores & weighted Average Combined LTV Ratios (Details) - score		Dec. 31, 2018	Dec. 31, 2017
Residential Portfolio Segment [Member]
Weighted average FICO scores and the weighted average combined LTV Ratio
FICO score (re-scored)	[1]	749	745
Financing Receivable With Credit Quality Of Loan Based Upon the Weighted Average Loan-To-Value Ratio	[2]	58.60%	59.20%
Home Equity [Member]
Weighted average FICO scores and the weighted average combined LTV Ratio
FICO score (re-scored)	[1]	767	766
Financing Receivable With Credit Quality Of Loan Based Upon the Weighted Average Loan-To-Value Ratio	[2],[3]	49.30%	50.10%
[1]	The average FICO scores at December 31, 2018 are based upon rescores available from November 2018 and origination score data for loans booked in December 2018. The average FICO scores at December 31, 2017 are based upon rescores available from August 2017 and origination score data for loans booked between September and December 2017.
[2]	(2) The combined LTV ratios for December 31, 2018
[3]	(3)For home equity loans and lines in a subordinate lien, the LTV data represents a combined LTV, taking into account the senior lien data for loans and lines.

Summary of Nonaccrual Loans (De

Summary of Nonaccrual Loans (Details) - USD ($) $ in Thousands		Dec. 31, 2018		Dec. 31, 2017
Financing Receivable Impaired [Line Items]
TDRs on nonaccrual status		$ 29,348	[1]	$ 6,067
Financing Receivable, Recorded Investment, Nonaccrual Status	[2]	45,413		49,630
Commercial and Industrial [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status		26,310		32,055
Commercial Real Estate [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status		3,015		3,123
Construction Loans [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status		311		0
Small Business [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status		235		230
Residential Real Estate [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status		8,251		8,129
Home Equity [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status		7,278		6,022
Consumer Portfolio Segment [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status		$ 13		$ 71
[1]	(1)During the fourth quarter of 2018 nonaccrual loans associated with a large commercial loan customer that had previously declared bankruptcy were modified when a court confirmed the customer's bankruptcy reorganization plan. That revision to loan terms required the Company to deem loans associated with the customer as troubled debt restructures as of December 31, 2018 which amounted to $25.9 million.
[2]	(1) Included in these amounts were $29.3 million and $6.1 million of nonaccruing TDRs at December 31, 2018 and 2017

LOANS, ALLOWANCE FOR LOAN LOS_3

LOANS, ALLOWANCE FOR LOAN LOSSES AND CREDIT QUALITY Foreclosed Residential Real Estate Property (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Foreclosed Residential Real Estate Property [Line Items]
Foreclosed residential real estate property held by the creditor	$ 0	$ 612
Mortgage Loans in Process of Foreclosure, Amount	$ 3,174	$ 2,971

Age Analysis of Past Due Financ

Age Analysis of Past Due Financing receivables (Details) $ in Thousands	Dec. 31, 2018USD ($)loan	Dec. 31, 2017USD ($)loan	Dec. 31, 2016USD ($)
Age Analysis of Past Due Financing Receivables
Number of Loans 30-59 Days | loan	400	319
Number of Loans 60-89 Days | loan	56	48
Number of Loans 90 Days or More | loan	110	92
Number of Loans Total Past Due | loan	566	459
Principal Balance Total Past Due	$ 46,348	$ 48,746
Current	6,859,846	6,306,807
Total loans	6,906,194	6,355,553	$ 5,999,605	[1]
Recorded Investment >90 Days and Accruing	$ 5	$ 8
Commercial and Industrial [Member]
Age Analysis of Past Due Financing Receivables
Number of Loans 30-59 Days | loan	0	2
Number of Loans 60-89 Days | loan	4	2
Number of Loans 90 Days or More | loan	11	14
Number of Loans Total Past Due | loan	15	18
Principal Balance Total Past Due	$ 26,693	$ 32,572
Current	1,066,936	855,956
Total loans	1,093,629	888,528	902,053
Recorded Investment >90 Days and Accruing	$ 0	$ 0
Commercial Real Estate [Member]
Age Analysis of Past Due Financing Receivables
Number of Loans 30-59 Days | loan	9	7
Number of Loans 60-89 Days | loan	0	0
Number of Loans 90 Days or More | loan	8	9
Number of Loans Total Past Due | loan	17	16
Principal Balance Total Past Due	$ 3,877	$ 4,853
Current	3,247,371	3,111,708
Total loans	3,251,248	3,116,561	3,010,798
Recorded Investment >90 Days and Accruing	$ 0	$ 0
Construction Loans [Member]
Age Analysis of Past Due Financing Receivables
Number of Loans 30-59 Days | loan	1	0
Number of Loans 60-89 Days | loan	0	0
Number of Loans 90 Days or More | loan	1	0
Number of Loans Total Past Due | loan	2	0
Principal Balance Total Past Due	$ 1,582	$ 0
Current	363,583	401,797
Total loans	365,165	401,797	320,391
Recorded Investment >90 Days and Accruing	$ 0	$ 0
Small Business [Member]
Age Analysis of Past Due Financing Receivables
Number of Loans 30-59 Days | loan	15	17
Number of Loans 60-89 Days | loan	19	11
Number of Loans 90 Days or More | loan	24	10
Number of Loans Total Past Due | loan	58	38
Principal Balance Total Past Due	$ 755	$ 540
Current	163,921	131,830
Total loans	164,676	132,370	122,726
Recorded Investment >90 Days and Accruing	$ 0	$ 0
Residential Real Estate [Member]
Age Analysis of Past Due Financing Receivables
Number of Loans 30-59 Days | loan	23	6
Number of Loans 60-89 Days | loan	6	13
Number of Loans 90 Days or More | loan	25	22
Number of Loans Total Past Due | loan	54	41
Principal Balance Total Past Due	$ 8,389	$ 6,726
Current	914,905	747,603
Total loans	923,294	754,329	644,426
Recorded Investment >90 Days and Accruing	$ 0	$ 0
Home Equity [Member]
Age Analysis of Past Due Financing Receivables
Number of Loans 30-59 Days | loan	22	22
Number of Loans 60-89 Days | loan	12	6
Number of Loans 90 Days or More | loan	29	20
Number of Loans Total Past Due | loan	63	48
Principal Balance Total Past Due	$ 4,849	$ 3,786
Current	1,087,235	1,048,302
Total loans	1,092,084	1,052,088	988,147
Recorded Investment >90 Days and Accruing	$ 0	$ 0
Consumer Portfolio Segment [Member]
Age Analysis of Past Due Financing Receivables
Number of Loans 30-59 Days | loan	330	265
Number of Loans 60-89 Days | loan	15	16
Number of Loans 90 Days or More | loan	12	17
Number of Loans Total Past Due | loan	357	298
Principal Balance Total Past Due	$ 203	$ 269
Current	15,895	9,611
Total loans	16,098	9,880	$ 11,064
Recorded Investment >90 Days and Accruing	5	8
Financing Receivables, 30 to 59 Days Past Due [Member]
Age Analysis of Past Due Financing Receivables
Principal Balance Total Past Due	8,402	5,971
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial and Industrial [Member]
Age Analysis of Past Due Financing Receivables
Principal Balance Total Past Due	0	195
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Real Estate [Member]
Age Analysis of Past Due Financing Receivables
Principal Balance Total Past Due	1,627	3,060
Financing Receivables, 30 to 59 Days Past Due [Member] | Construction Loans [Member]
Age Analysis of Past Due Financing Receivables
Principal Balance Total Past Due	1,271	0
Financing Receivables, 30 to 59 Days Past Due [Member] | Small Business [Member]
Age Analysis of Past Due Financing Receivables
Principal Balance Total Past Due	506	339
Financing Receivables, 30 to 59 Days Past Due [Member] | Residential Real Estate [Member]
Age Analysis of Past Due Financing Receivables
Principal Balance Total Past Due	3,486	870
Financing Receivables, 30 to 59 Days Past Due [Member] | Home Equity [Member]
Age Analysis of Past Due Financing Receivables
Principal Balance Total Past Due	1,331	1,310
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer Portfolio Segment [Member]
Age Analysis of Past Due Financing Receivables
Principal Balance Total Past Due	181	197
Financing Receivables, 60 to 89 Days Past Due [Member]
Age Analysis of Past Due Financing Receivables
Principal Balance Total Past Due	1,854	3,377
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial and Industrial [Member]
Age Analysis of Past Due Financing Receivables
Principal Balance Total Past Due	382	370
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Real Estate [Member]
Age Analysis of Past Due Financing Receivables
Principal Balance Total Past Due	0	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Construction Loans [Member]
Age Analysis of Past Due Financing Receivables
Principal Balance Total Past Due	0	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Small Business [Member]
Age Analysis of Past Due Financing Receivables
Principal Balance Total Past Due	87	144
Financing Receivables, 60 to 89 Days Past Due [Member] | Residential Real Estate [Member]
Age Analysis of Past Due Financing Receivables
Principal Balance Total Past Due	521	2,385
Financing Receivables, 60 to 89 Days Past Due [Member] | Home Equity [Member]
Age Analysis of Past Due Financing Receivables
Principal Balance Total Past Due	855	451
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer Portfolio Segment [Member]
Age Analysis of Past Due Financing Receivables
Principal Balance Total Past Due	9	27
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Age Analysis of Past Due Financing Receivables
Principal Balance Total Past Due	36,092	39,398
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial and Industrial [Member]
Age Analysis of Past Due Financing Receivables
Principal Balance Total Past Due	26,311	32,007
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Real Estate [Member]
Age Analysis of Past Due Financing Receivables
Principal Balance Total Past Due	2,250	1,793
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Construction Loans [Member]
Age Analysis of Past Due Financing Receivables
Principal Balance Total Past Due	311	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Small Business [Member]
Age Analysis of Past Due Financing Receivables
Principal Balance Total Past Due	162	57
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Residential Real Estate [Member]
Age Analysis of Past Due Financing Receivables
Principal Balance Total Past Due	4,382	3,471
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Home Equity [Member]
Age Analysis of Past Due Financing Receivables
Principal Balance Total Past Due	2,663	2,025
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer Portfolio Segment [Member]
Age Analysis of Past Due Financing Receivables
Principal Balance Total Past Due	$ 13	$ 45
[1]	The amount of net deferred costs on originated loans included in the ending balance was $7.1 million , $6.1 million and $5.1 million at December 31, 2018 , 2017 and 2016 , respectively. Net unamortized discounts on acquired loans not deemed to be PCI included in the ending balance were $15.2 million , $9.4 million and $8.6 million at December 31, 2018 , 2017 and 2016

TDR's and Other Pertinent Infor

TDR's and Other Pertinent Information (Details) - USD ($) $ in Thousands	Dec. 31, 2018		Dec. 31, 2017
Summary of Troubled Debt Restructurings and other pertinent information
TDRs on accrual status	$ 23,849		$ 25,852
TDRs on nonaccrual status	29,348	[1]	6,067
Total TDRs	53,197		31,919
Amount of specific reserves included in the allowance for loan loss associated with TDRs:	1,079		1,342
Additional commitments to lend to a borrower who has been a party to a TDR:	$ 982		$ 487
[1]	(1)During the fourth quarter of 2018 nonaccrual loans associated with a large commercial loan customer that had previously declared bankruptcy were modified when a court confirmed the customer's bankruptcy reorganization plan. That revision to loan terms required the Company to deem loans associated with the customer as troubled debt restructures as of December 31, 2018 which amounted to $25.9 million.

Modification which Occurred Dur

Modification which Occurred During the Period & Change in Recorded Investment (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)contract	Dec. 31, 2017USD ($)contract	Dec. 31, 2016USD ($)contract
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract	29	54	50
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 38,898	$ 8,130	$ 7,663
TROUBLED DEBT RESTRUCTURINGS:
Post-Modification Outstanding Recorded Investment	$ 42,457	$ 8,175	$ 7,705
Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract	12	12	10
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 35,688	$ 1,787	$ 1,623
TROUBLED DEBT RESTRUCTURINGS:
Post-Modification Outstanding Recorded Investment	$ 39,224	$ 1,787	$ 1,623
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract	3	6	10
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 1,600	$ 2,705	$ 2,959
TROUBLED DEBT RESTRUCTURINGS:
Post-Modification Outstanding Recorded Investment	$ 1,600	$ 2,705	$ 2,959
Small Business [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract		9	3
Financing Receivable, Modifications, Pre-Modification Recorded Investment		$ 369	$ 188
TROUBLED DEBT RESTRUCTURINGS:
Post-Modification Outstanding Recorded Investment		$ 369	$ 188
Residential Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract	5	10	8
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 1,048	$ 1,284	$ 1,808
TROUBLED DEBT RESTRUCTURINGS:
Post-Modification Outstanding Recorded Investment	$ 1,071	$ 1,326	$ 1,850
Home Equity Line of Credit [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract	9	17	13
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 562	$ 1,985	$ 932
TROUBLED DEBT RESTRUCTURINGS:
Post-Modification Outstanding Recorded Investment	$ 562	$ 1,988	$ 932
Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract			6
Financing Receivable, Modifications, Pre-Modification Recorded Investment			$ 153
TROUBLED DEBT RESTRUCTURINGS:
Post-Modification Outstanding Recorded Investment			$ 153

Post-modification balance of TD

Post-modification balance of TDRs Listed by type of Modification (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Loans, Allowance for Loan Losses and Credit Quality [Abstract]
Extended maturity	$ 2,878	$ 5,881	$ 5,044
Adjusted interest rate	57	0	92
Combination rate and maturity	38,812	568	1,035
Court ordered concession	710	1,726	1,534
Total	$ 42,457	$ 8,175	$ 7,705

TDR's that have subsequent defa

TDR's that have subsequent default (Details)	12 Months Ended
	Dec. 31, 2018USD ($)contract	Dec. 31, 2017USD ($)contract	Dec. 31, 2016USD ($)contract
TROUBLED DEBT RESTRUCTURINGS THAT SUBSEQUENTLY DEFAULTED:
Recorded Investment | $	$ 0	$ 122,000	$ 249,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | contract	0	1	1
Commercial And Industrial [Member]
TROUBLED DEBT RESTRUCTURINGS THAT SUBSEQUENTLY DEFAULTED:
Recorded Investment | $	$ 0		$ 0
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | contract	0	1	0
Commercial Real Estate [Member]
TROUBLED DEBT RESTRUCTURINGS THAT SUBSEQUENTLY DEFAULTED:
Recorded Investment | $	$ 0	$ 0
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | contract	0	0	1
Residential Real Estate [Member]
TROUBLED DEBT RESTRUCTURINGS THAT SUBSEQUENTLY DEFAULTED:
Recorded Investment | $	$ 0	$ 0	$ 0
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | contract	0	0	0
Home Equity Line of Credit [Member]
TROUBLED DEBT RESTRUCTURINGS THAT SUBSEQUENTLY DEFAULTED:
Recorded Investment | $	$ 0	$ 0	$ 0
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | contract	0	0	0

Impaired Loan Information by Po

Impaired Loan Information by Portfolio (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Impaired loans by loan portfolio
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	$ 1,079	$ 1,342	$ 5,214
Related Allowance	1,079	1,342	5,214
Recorded Investment	59,060	72,801	77,297
Unpaid Principal Balance	68,514	79,276	81,071
Average Recorded Investment	63,522	76,180	77,209
Interest Income Recognized	1,554	2,026	2,700
Commercial and Industrial [Member]
Impaired loans by loan portfolio
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	7	10	3,661
Commercial Real Estate [Member]
Impaired loans by loan portfolio
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	37	42	196
Construction Loans [Member]
Impaired loans by loan portfolio
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0	0	0
Small Business [Member]
Impaired loans by loan portfolio
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	1	1	8
Residential Real Estate [Member]
Impaired loans by loan portfolio
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	862	1,007	1,086
Home Equity [Member]
Impaired loans by loan portfolio
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	164	265	242
Consumer Portfolio Segment [Member]
Impaired loans by loan portfolio
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	8	17	21
With No Related Allowance Recorded [Member]
Impaired loans by loan portfolio
Recorded Investment	47,900	57,373	49,745
Unpaid Principal Balance	56,125	62,867	52,377
Average Recorded Investment	51,970	60,380	48,814
Interest Income Recognized	1,111	1,449	1,764
Related Allowance	0	0	0
With No Related Allowance Recorded [Member] | Commercial and Industrial [Member]
Impaired loans by loan portfolio
Recorded Investment	28,459	34,267	28,776
Unpaid Principal Balance	35,913	38,329	29,772
Average Recorded Investment	31,117	36,631	26,472
Interest Income Recognized	142	446	927
Related Allowance	0	0	0
With No Related Allowance Recorded [Member] | Commercial Real Estate [Member]
Impaired loans by loan portfolio
Recorded Investment	9,552	13,245	11,628
Unpaid Principal Balance	9,832	14,374	12,891
Average Recorded Investment	10,561	13,683	12,744
Interest Income Recognized	519	559	437
Related Allowance	0	0	0
With No Related Allowance Recorded [Member] | Construction Loans [Member]
Impaired loans by loan portfolio
Related Allowance			0
With No Related Allowance Recorded [Member] | Small Business [Member]
Impaired loans by loan portfolio
Recorded Investment	358	556	494
Unpaid Principal Balance	439	619	569
Average Recorded Investment	401	569	534
Interest Income Recognized	14	21	20
Related Allowance	0	0	0
With No Related Allowance Recorded [Member] | Residential Real Estate [Member]
Impaired loans by loan portfolio
Recorded Investment	4,518	4,264	4,216
Unpaid Principal Balance	4,686	4,397	4,427
Average Recorded Investment	4,597	4,332	4,302
Interest Income Recognized	212	218	185
Related Allowance	0	0	0
With No Related Allowance Recorded [Member] | Home Equity [Member]
Impaired loans by loan portfolio
Recorded Investment	4,957	4,950	4,485
Unpaid Principal Balance	5,199	5,056	4,572
Average Recorded Investment	5,230	5,063	4,602
Interest Income Recognized	220	198	184
Related Allowance	0	0	0
With No Related Allowance Recorded [Member] | Consumer Portfolio Segment [Member]
Impaired loans by loan portfolio
Recorded Investment	56	91	146
Unpaid Principal Balance	56	92	146
Average Recorded Investment	64	102	160
Interest Income Recognized	4	7	11
Related Allowance	0	0	0
With Allowance Recorded [Member]
Impaired loans by loan portfolio
Recorded Investment	11,160	15,428	27,552
Unpaid Principal Balance	12,389	16,409	28,694
Average Recorded Investment	11,552	15,800	28,395
Interest Income Recognized	443	577	936
With Allowance Recorded [Member] | Commercial and Industrial [Member]
Impaired loans by loan portfolio
Recorded Investment	370	376	10,402
Unpaid Principal Balance	370	376	10,440
Average Recorded Investment	385	391	10,760
Interest Income Recognized	19	19	325
With Allowance Recorded [Member] | Commercial Real Estate [Member]
Impaired loans by loan portfolio
Recorded Investment	1,287	3,393	5,185
Unpaid Principal Balance	1,287	3,399	5,533
Average Recorded Investment	1,311	3,447	5,491
Interest Income Recognized	74	198	200
With Allowance Recorded [Member] | Small Business [Member]
Impaired loans by loan portfolio
Recorded Investment	183	147	377
Unpaid Principal Balance	223	153	392
Average Recorded Investment	225	238	408
Interest Income Recognized	13	14	21
With Allowance Recorded [Member] | Residential Real Estate [Member]
Impaired loans by loan portfolio
Recorded Investment	8,188	9,420	9,959
Unpaid Principal Balance	9,217	10,154	10,530
Average Recorded Investment	8,459	9,575	10,065
Interest Income Recognized	289	284	332
With Allowance Recorded [Member] | Home Equity [Member]
Impaired loans by loan portfolio
Recorded Investment	991	1,876	1,378
Unpaid Principal Balance	1,149	2,110	1,547
Average Recorded Investment	1,018	1,916	1,403
Interest Income Recognized	43	55	50
With Allowance Recorded [Member] | Consumer Portfolio Segment [Member]
Impaired loans by loan portfolio
Recorded Investment	141	216	251
Unpaid Principal Balance	143	217	252
Average Recorded Investment	154	233	268
Interest Income Recognized	$ 5	$ 7	$ 8

Purchased Credit Impaired Loans

Purchased Credit Impaired Loans - Outstanding/Carrying Balance (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	$ 9,749	$ 14,485
Financing Receivable, Net	4,874,718	4,539,256
Financial Asset Acquired with Credit Deterioration [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Financing Receivable, Net	$ 8,795	$ 13,023	$ 18,392

LOANS, ALLOWANCE FOR LOAN LOS_4

LOANS, ALLOWANCE FOR LOAN LOSSES AND CREDIT QUALITY (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2018		Dec. 31, 2017	Dec. 31, 2016
Loans, Allowance for Loan Losses and Credit Quality [Abstract]
Unamortized Loan Commitment and Origination fees	$ 7,100,000		$ 6,100,000	$ 5,100,000
Unamortized Discounts or Premiums	$ 15,200,000		9,400,000	$ 8,600,000
Days To Be Termed As Non Accrual Loans	90 days
Significant advanced considered for risk rating change	$ 50,000
TDRs on nonaccrual status	$ 29,348,000	[1]	$ 6,067,000
[1]	(1)During the fourth quarter of 2018 nonaccrual loans associated with a large commercial loan customer that had previously declared bankruptcy were modified when a court confirmed the customer's bankruptcy reorganization plan. That revision to loan terms required the Company to deem loans associated with the customer as troubled debt restructures as of December 31, 2018 which amounted to $25.9 million.

LOANS, ALLOWANCE FOR LOAN LOS_5

LOANS, ALLOWANCE FOR LOAN LOSSES AND CREDIT QUALITY Activity in the Accretable Yield PCI Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Beginning balance	$ 1,791	$ 2,370
Accretion	(1,135)	(1,475)
Certainloansacquiredinatransfernotaccountedforasdebtsecuritiesaccretableyieldadjustmentchangesinexpectedcashflow	310	748
Reclassification from nonaccretable difference for loans with improved cash flows	225	148
Ending balance	$ 1,191	$ 1,791

BANK PREMISES AND EQUIPMENT (De

BANK PREMISES AND EQUIPMENT (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Total cost	$ 182,787,000	$ 171,227,000
Accumulated depreciation	(85,206,000)	(76,505,000)
Net bank premises and equipment	97,581,000	94,722,000
Depreciation expense	9,100,000	8,500,000	$ 7,300,000
Rental Income, Nonoperating	1,600,000	1,300,000
Operating Leases, Income Statement, Depreciation Expense on Property Subject to or Held-for-lease	1,300,000	939,000
Land [Member]
Property, Plant and Equipment [Line Items]
Total cost	24,502,000	23,719,000
Bank Premises [Member]
Property, Plant and Equipment [Line Items]
Total cost	$ 53,052,000	49,159,000
Bank Premises [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	5 years
Bank Premises [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	40 years
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Total cost	$ 27,615,000	25,184,000
Leasehold Improvements [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	1 year
Leasehold Improvements [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	27 years
Furniture and Equipment [Member]
Property, Plant and Equipment [Line Items]
Total cost	$ 66,974,000	62,521,000
Furniture and Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	2 years
Furniture and Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	12 years
Equipment Leased to Other Party [Member]
Property, Plant and Equipment [Line Items]
Total cost	$ 10,644,000	$ 10,644,000
Equipment Leased to Other Party [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	7 years

GOODWILL AND IDENTIFIABLE INT_3

GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 256,105	$ 231,806	$ 221,526
Other Intangible Assets	15,250	9,341
Total goodwill and other intangible assets	271,355	241,147
Core Deposits [Member]
Finite-Lived Intangible Assets [Line Items]
Other Intangible Assets	13,692	8,636
Other identifiable Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Other Intangible Assets	$ 1,558	$ 705

GOODWILL AND IDENTIFIABLE INT_4

GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Goodwill [Roll Forward]
Balance at beginning of year	$ 231,806	$ 221,526
Acquisitions	24,299	10,280
Balance at end of year	$ 256,105	$ 231,806

GOODWILL AND IDENTIFIABLE INT_5

GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS (Details 2) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 37,240	$ 29,901
Accumulated Amortization	(21,990)	(20,560)
Net Carrying Amount	15,250	9,341
Core Deposits [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	34,137	26,736
Accumulated Amortization	(20,445)	(18,100)
Net Carrying Amount	13,692	8,636
Other intangible assets [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	3,103	3,165
Accumulated Amortization	(1,545)	(2,460)
Net Carrying Amount	$ 1,558	$ 705

GOODWILL AND IDENTIFIABLE INT_6

GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS (Details 3) $ in Thousands	Dec. 31, 2018USD ($)
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2,019	$ 3,050
2,020	2,647
2,021	2,394
2,022	1,962
2,023	$ 1,697

GOODWILL AND IDENTIFIABLE INT_7

GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	$ 2.7	$ 3.5	$ 2.8
Weighted average amortization period for intangible assets	10 years

DEPOSITS (Details)

DEPOSITS (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Banking and Thrift [Abstract]
Deposit Liabilities Reclassified as Loans Receivable	$ 3,300	$ 2,300
Deposit Liabilities, Collateral Issued, Financial Instruments	356,800	349,200
Time Deposits, Fiscal Year Maturity [Abstract]
1 year or less	511,292	393,452
Over 1 year to 2 years	111,487	119,341
Over 2 years to 3 years	41,523	57,619
Over 3 years to 4 years	27,040	41,183
Over 4 years to 5 years	19,761	32,706
Time Deposits	$ 711,103	$ 644,301
1 year or less (as percent)	71.90%	61.10%
Over 1 years to 2 years (as percent)	15.70%	18.50%
Over 2 years to 3 years (as percent)	5.80%	8.90%
Over 3 years to 4 years (as percent)	3.80%	6.40%
Over 4 years to 5 years (as percent)	2.80%	5.10%
Time Deposits (as percent)	100.00%	100.00%
Deposits over $250,000.00	$ 104,900	$ 80,000

BORROWINGS (FHLB Advances) (Det

BORROWINGS (FHLB Advances) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt Disclosure [Abstract]
Federal Home Loan Bank, Advances, Maturities Summary, Due in Next Twelve Months	$ 147,046	$ 52,475
Federal Home Loan Bank, Advances, Activity for Year, Average Interest Rate for Year	2.68%	1.58%
Federal Home Loan Bank, Advances, Maturities Summary, Due in Year Two		$ 0
Federal Home Loan Bank, Advances, Maturities Summary, Average Interest Rate, One to Two Years from Balance Sheet Date		0.00%
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances	$ 147,046	$ 52,475
Federal Home Loan Bank, Advances, Weighted Average Interest Rate	2.68%	1.58%
Debt Instrument, Unamortized Premium	$ 760	$ 789
Total Federal Home Loan Bank Advances	$ 147,806	$ 53,264

BORROWINGS Repurchase Agreement

BORROWINGS Repurchase Agreements (Details) - Maturity Overnight [Member] - USD ($) $ in Thousands		Dec. 31, 2018	Dec. 31, 2017
Assets Sold under Agreements to Repurchase [Line Items]
Financial Assets Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement	[1]	$ 0	$ 162,679
U.S. Government agency securities
Assets Sold under Agreements to Repurchase [Line Items]
Financial Assets Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement		0	16,867
Agency mortgage-backed securities [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Financial Assets Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement		0	51,273
Collateralized Mortgage Backed Securities [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Financial Assets Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement		$ 0	$ 94,539
[1]	All customer repurchase agreements had an overnight and continuous maturity date.

BORROWINGS (Long-Term Debt) (De

BORROWINGS (Long-Term Debt) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Total Long-Term Borrowings	$ 110,901	$ 107,755
Subordinated Debt	34,728	34,682
Junior Subordinated Debentures [Member] | Capital Trust V Preferred Securities Due in 2037 [Member]
Debt Instrument [Line Items]
Total Long-Term Borrowings	51,505	51,503
Junior Subordinated Debentures [Member] | Slades Ferry Trust I Preferred Securities Due in 2034 [Member]
Debt Instrument [Line Items]
Total Long-Term Borrowings	10,234	10,229
Junior Subordinated Debentures [Member] | Central Bancorp Capital Trust I Securities Due in 2034 [Member]
Debt Instrument [Line Items]
Total Long-Term Borrowings	5,258	5,258
Junior Subordinated Debentures [Member] | Central Bancorp Capital Trust II Securities Due in 2037 [Member]
Debt Instrument [Line Items]
Total Long-Term Borrowings	6,083	6,083
Junior Subordinated Debentures [Member] | East Main Street Trust [Member]
Debt Instrument [Line Items]
Total Long-Term Borrowings	$ 3,093	$ 0

BORROWINGS (Trust Preferred Sec

BORROWINGS (Trust Preferred Securities) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Junior Subordinated Debentures [Member]
Debt Instrument [Line Items]
Face Amount	$ 74	$ 71
Junior Subordinated Debentures [Member] | Capital Trust V Preferred Securities Due in 2037 [Member]
Debt Instrument [Line Items]
Face Amount	$ 50
Debt Instrument, interest rate, stated rate inclusive of interest rate swap - expired	2.84%
Fixed rate	4.27%
Junior Subordinated Debentures [Member] | Capital Trust V Preferred Securities Due in 2037 [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	1.48%
Junior Subordinated Debentures [Member] | Slades Ferry Trust I Preferred Securities Due in 2034 [Member]
Debt Instrument [Line Items]
Face Amount	$ 10
Fixed rate	5.59%
Junior Subordinated Debentures [Member] | Slades Ferry Trust I Preferred Securities Due in 2034 [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	2.79%
Junior Subordinated Debentures [Member] | Central Bancorp Capital Trust I Securities Due in 2034 [Member]
Debt Instrument [Line Items]
Face Amount	$ 5.1
Fixed rate	5.23%
Junior Subordinated Debentures [Member] | Central Bancorp Capital Trust I Securities Due in 2034 [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	2.44%
Junior Subordinated Debentures [Member] | Central Bancorp Capital Trust II Securities Due in 2037 [Member]
Debt Instrument [Line Items]
Face Amount	$ 5.9
Junior Subordinated Debentures [Member] | Central Bancorp Capital Trust II Securities Due in 2037 [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	1.65%
Fixed rate	4.44%
Subordinated Debt [Member] | Subordinated Debentures Due in November 2019 [Member] [Domain]
Debt Instrument [Line Items]
Fixed rate	4.75%
Subordinated Debt [Member] | Subordinated Debentures Due in November 2019 [Member] [Domain] | LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	2.98%

BORROWINGS (Maturities of Long-

BORROWINGS (Maturities of Long-Term Debt) (Details) $ in Thousands	Dec. 31, 2018USD ($)
Long-term Debt, Fiscal Year Maturity [Abstract]
2,015	$ 0
2,016	0
2,017	0
2,018	0
2,019	0
Thereafter	111,291
Total	111,291
Junior Subordinated Debentures [Member] | Capital Trust V Preferred Securities Due in 2037 [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
2,015	0
2,016	0
2,017	0
2,018	0
2,019	0
Thereafter	51,547
Total	51,547
Junior Subordinated Debentures [Member] | Slades Ferry Trust I Preferred Securities Due in 2034 [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
2,015	0
2,016	0
2,017	0
2,018	0
2,019	0
Thereafter	10,310
Total	10,310
Junior Subordinated Debentures [Member] | Central Bancorp Capital Trust I Securities Due in 2034 [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
2,015	0
2,016	0
2,017	0
2,018	0
2,019	0
Thereafter	5,258
Total	5,258
Junior Subordinated Debentures [Member] | Central Bancorp Capital Trust II Securities Due in 2037 [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
2,015	0
2,016	0
2,017	0
2,018	0
2,019	0
Thereafter	6,083
Total	6,083
Junior Subordinated Debentures [Member] | East Main Street Trust [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
2,015	0
2,016	0
2,017	0
2,018	0
2,019	0
Thereafter	3,093
Total	3,093
Subordinated Debentures [Member] | Subordinated Debentures Due August 27, 2018 [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
2,015	0
2,016	0
2,017	0
2,018	0
2,019	0
Thereafter	35,000
Total	$ 35,000

BORROWINGS (Details Textual)

BORROWINGS (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Subordinated Debt	$ 34,728,000	$ 34,682,000
Interest Expense, Long-term Debt	4,200,000	4,000,000	$ 5,800,000
Loans Pledged as Collateral	$ 1,600,000,000	$ 1,500,000,000
Federal Home Loan Bank Advances Weighted Average Interest Rate inclusive of Swaps	2.55%	2.47%
Securities Sold under Agreements to Repurchase	$ 0	$ 162,679,000
Interest expense on short-term borrowings	248,000	257,000	$ 208,000
Total Long-Term Borrowings	110,901,000	107,755,000
East Main Street Trust [Member] | Junior Subordinated Debt [Member]
Debt Instrument [Line Items]
Total Long-Term Borrowings	3,093,000	0
Parent Company [Member]
Debt Instrument [Line Items]
Subordinated Debt	35,000,000	35,000,000
Capital Trust V Preferred Securities Due in 2037 [Member] | Junior Subordinated Debt [Member]
Debt Instrument [Line Items]
Total Long-Term Borrowings	$ 51,505,000	51,503,000
Fixed rate	4.27%
Debt Instrument, interest rate, stated rate inclusive of interest rate swap - expired	2.84%
Capital Trust V Preferred Securities Due in 2037 [Member] | Junior Subordinated Debt [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	1.48%
Subordinated Debentures Due in November 2019 [Member] [Domain] | Subordinated Debentures [Member]
Debt Instrument [Line Items]
Fixed rate	4.75%
Subordinated Debentures Due in November 2019 [Member] [Domain] | Subordinated Debentures [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	2.98%
Slades Ferry Trust I Preferred Securities Due in 2034 [Member] | Junior Subordinated Debt [Member]
Debt Instrument [Line Items]
Total Long-Term Borrowings	$ 10,234,000	10,229,000
Fixed rate	5.59%
Slades Ferry Trust I Preferred Securities Due in 2034 [Member] | Junior Subordinated Debt [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	2.79%
Central Bancorp Capital Trust I Securities Due in 2034 [Member] | Junior Subordinated Debt [Member]
Debt Instrument [Line Items]
Total Long-Term Borrowings	$ 5,258,000	5,258,000
Fixed rate	5.23%
Central Bancorp Capital Trust I Securities Due in 2034 [Member] | Junior Subordinated Debt [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	2.44%
Central Bancorp Capital Trust II Securities Due in 2037 [Member] | Junior Subordinated Debt [Member]
Debt Instrument [Line Items]
Total Long-Term Borrowings	$ 6,083,000	6,083,000
Central Bancorp Capital Trust II Securities Due in 2037 [Member] | Junior Subordinated Debt [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Fixed rate	4.44%
Basis spread on variable rate	1.65%
Federal Home Loan Bank Advances [Member]
Debt Instrument [Line Items]
Federal home loan bank unused remaining available borrowing capacity	$ 953,500,000	$ 954,800,000
Line of credit maximum borrowing capacity	$ 5,000,000

EARNINGS PER SHARE (Details)

EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Earnings Per Share [Abstract]
Net income	$ 29,934	$ 33,015	$ 31,118	$ 27,555	$ 22,064	$ 23,852	$ 20,563	$ 20,725	$ 121,622	$ 87,204	$ 76,648
Weighted Average Shares (in shares)
Basic Shares (in shares)	27,815,437	27,537,841	27,526,653	27,486,573	27,445,739	27,436,792	27,257,799	27,029,640	27,592,380	27,294,028	26,404,071
Effect of dilutive securities (in shares)	58,576	63,499	54,525	67,381	77,615	76,307	74,497	81,283	61,428	78,076	51,847
Weighted average common shares (diluted) (in shares)	27,874,013	27,601,340	27,581,178	27,553,954	27,523,354	27,513,099	27,332,296	27,110,923	27,653,808	27,372,104	26,455,918
Net Income Available to Common Shareholders per Share (in dollars per share)
Basic EPS (in dollars per share)	$ 1.08	$ 1.20	$ 1.13	$ 1	$ 0.80	$ 0.87	$ 0.75	$ 0.77	$ 4.41	$ 3.19	$ 2.90
Effect of Dilutive Securities (in dollars per share)									(0.01)	0
Diluted EPS (in dollars per share)	$ 1.07	$ 1.20	$ 1.13	$ 1	$ 0.80	$ 0.87	$ 0.75	$ 0.76	$ 4.40	$ 3.19	$ 2.90

EARNINGS PER SHARE (Details 1)

EARNINGS PER SHARE (Details 1) - shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Performance Shares [Member]
Details of anti dilutive options to purchase common stock
Stock options	0	0	0
Stock options [Member]
Details of anti dilutive options to purchase common stock
Stock options	0	103	0

CUMULATIVELY GRANTED AWARDS (De

CUMULATIVELY GRANTED AWARDS (Details)	Dec. 31, 2018shares
2005 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized Stock Awards	1,650,000
Cumulative Granted, Net of Forfeitures and Expirations	1,138,189
Authorized but Unissued	511,811
2005 Plan [Member] | Stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cumulative Granted, Net of Forfeitures and Expirations	387,258
2005 Plan [Member] | Restricted stock awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cumulative Granted, Net of Forfeitures and Expirations	750,931
2010 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized Stock Awards	314,600
Cumulative Granted, Net of Forfeitures and Expirations	139,745
Authorized but Unissued	174,855	[1]
2010 Plan [Member] | Stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cumulative Granted, Net of Forfeitures and Expirations	46,500
2010 Plan [Member] | Restricted stock awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cumulative Granted, Net of Forfeitures and Expirations	93,245
Two Thousand Eighteen Nonemployee Director Stock Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized Stock Awards	300,000
Cumulative Granted, Net of Forfeitures and Expirations	6,000
Authorized but Unissued	294,000	[1]
Two Thousand Eighteen Nonemployee Director Stock Plan [Member] | Stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cumulative Granted, Net of Forfeitures and Expirations	0
Two Thousand Eighteen Nonemployee Director Stock Plan [Member] | Restricted stock awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cumulative Granted, Net of Forfeitures and Expirations	6,000
[1]	The Company may award up to a total of 300,000 shares from the 2018 Plan, inclusive of 174,855

PRE TAX EXPENSE (Details 1)

PRE TAX EXPENSE (Details 1) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock based award expense		$ 4,225	$ 3,333	$ 2,965
Related tax benefits recognized in earnings		1,188	1,362	1,211
Stock options [Member] | Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock based award expense		66	76	72
Restricted stock awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock based award expense	[1]	3,299	2,730	2,590
Restricted stock awards [Member] | Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock based award expense		$ 860	$ 527	$ 303
[1]	Inclusive of compensation expense associated with time-vested and performance-based restricted stock awards.

STOCK OPTION AWARDS DURING PERI

STOCK OPTION AWARDS DURING PERIOD (Details 3) - Stock options [Member] - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average remaining recognition period (years)	1 year
Shares granted	5,000
Weighted average grant date fair value of options granted (per share)	$ 13.46	$ 12.43	$ 11.03
2/20/2016 | 2010 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted			5,000
Vesting period			22 months
Investment Options, Expiration Date			Feb. 20, 2026
Expected volatility			32.44%
Expected life (years)			5 years 6 months
Expected dividend yield			2.28%
Risk free interest rate			1.29%
Weighted average grant date fair value of options granted (per share)			$ 10.59
Options Granted Date Three [Member] | 2010 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted		5,000
Vesting period		14 months
Investment Options, Expiration Date		Nov. 7, 2027
Expected volatility		20.80%
Expected life (years)		5 years 6 months
Expected dividend yield		1.87%
Risk free interest rate		2.02%
Weighted average grant date fair value of options granted (per share)		$ 12.43
Options Granted Date Three [Member] | Two Thousand Eighteen Nonemployee Director Stock Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	5,000
Vesting period	21 months
Investment Options, Expiration Date	Apr. 3, 2028
Expected volatility	21.15%
Expected life (years)	5 years 6 months
Expected dividend yield	1.94%
Risk free interest rate	2.62%
Weighted average grant date fair value of options granted (per share)	$ 13.46
Options Granted Date Two [Member] | 2010 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted			5,000
Vesting period			18 months
Investment Options, Expiration Date			Jul. 14, 2026
Expected volatility			32.28%
Expected life (years)			5 years 6 months
Expected dividend yield			2.37%
Risk free interest rate			1.14%
Weighted average grant date fair value of options granted (per share)			$ 11.46

RELEVANT STOCK OPTION INFORMATI

RELEVANT STOCK OPTION INFORMATION (Details 4) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cash received from stock option exercises	$ 184	$ 214	$ 201
Stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of stock options vested based on grant date fair value	85	72	37
Intrinsic value of stock options exercised	1,525	1,082	494
Cash received from stock option exercises	1,024	918	680
Employee Service Share-based Compensation, Tax Benefit from Exercise of Stock Options	$ 429	$ 442	$ 204
Weighted average grant date fair value of options granted (per share)	$ 13.46	$ 12.43	$ 11.03

STOCK OPTION ROLLFORWARD (Detai

STOCK OPTION ROLLFORWARD (Details 5) - Stock options [Member] - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
		Dec. 31, 2018		Dec. 31, 2017	Dec. 31, 2016
Stock Option Awards, Outstanding (in shares):
Balance outstanding at beginning of period		84,000
Granted		5,000
Exercised		(34,500)
Forfeited		0
Expired		0
Balance outstanding at end of period		54,500	[1]	84,000
Options outstanding and expected to vest at December 31, 2018	[2]	54,500
Options exercisable at December 31, 2018	[3]	51,168
Weighted Average Exercise Price, Outstanding (in usd per share):
Balance outstanding at beginning of period		$ 32.16
Granted		70.85
Exercised		29.67
Forfeited		0
Expired		0
Balance outstanding at end of period		37.28		$ 32.16
Options outstanding and expected to vest at December 31, 2018		37.28
Options exercisable at December 31, 2018		$ 35.12
Balance at December 31, 2016, Weighted average remaining contractual term (years)		4 years 7 days
Options outstanding and expected to vest at December 31, 2016, Weighted Average Remaining Contractual Term (years)		4 years 7 days
Options exercisable at December 31, 2016, Weighted Average Remaining Contractual Term (years)		3 years 8 months 8 days
Balance at December 31, 2016, Aggregate Intrinsic Value	[4]	$ 1,776
Options outstanding and expected to vest at December 31, 2016, Aggregate Intrinsic Value	[4]	1,776
Options exercisable at December 31, 2016, Aggregate Intrinsic Value	[4]	$ 1,776
Stock Option Awards, Nonvested (in shares)
Balance nonvested at beginning of period		4,999
Granted		5,000
Vested		(6,667)
Forfeited		0
Expired		0
Balance nonvested at end of period		3,332		4,999
Weighted Average Grant Date Fair Value, Nonvested (in dollars per share):
Balance nonvested at beginning of period		$ 12.11
Granted		13.46		$ 12.43	$ 11.03
Vested		12.70
Forfeited		0
Expired		0
Balance nonvested at end of period		$ 12.94		$ 12.11
Unrecognized compensation cost		$ 23
Weighted average remaining recognition period (years)		1 year
[1]	Inclusive of 32,500
[2]	Inclusive of 32,500 vested stock options and expected to vest to Directors.
[3]	Inclusive of 29,168
[4]	The aggregate intrinsic value represents the total pre-tax intrinsic value, based on the average of the high price and low price at which the Company’s common stock traded on December 31, 2018 of $69.72

RSA GRANTS (Details 6)

RSA GRANTS (Details 6) - $ / shares		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Restricted stock awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value		$ 72.28
Restricted stock awards [Member] | Employee Stock Plan [Member] | 2/15/2018 | Ratably Over Period [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted		39,950
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	[1]	$ 71.75
Vesting terms		Ratably over 5 years from grant date
Restricted stock awards [Member] | Employee Stock Plan [Member] | 2/27/2018 | Ratably Over Period [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted		1,150
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	[1]	$ 72.60
Vesting terms		Ratably over 5 years from grant date
Restricted stock awards [Member] | Employee Stock Plan [Member] | 5/15/2018 | Ratably Over Period [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted		530
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	[1]	$ 74
Vesting terms		Ratably over 5 years from grant date
Restricted stock awards [Member] | Employee Stock Plan [Member] | 5/22/2018 | Ratably Over Period [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted		6,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	[1]	$ 76.58
Vesting terms	[2]	Immediately upon grant date
Restricted stock awards [Member] | Employee Stock Plan [Member] | 11/15/2018 | Ratably Over Period [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted		560
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	[1]	$ 77.78
Vesting terms		Ratably over 5 years from grant date
Restricted stock awards [Member] | Employee Stock Plan [Member] | 2/13/2017 | Ratably Over Period [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted			1,200
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	[1]		$ 62.53
Vesting terms			Ratably over 5 years from grant date
Restricted stock awards [Member] | Employee Stock Plan [Member] | 2/16/2017 | Ratably Over Period [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted			34,150
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	[1]		$ 63.10
Vesting terms			Ratably over 5 years from grant date
Restricted stock awards [Member] | Employee Stock Plan [Member] | 4/3/2017 | Ratably Over Period [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted			1,500
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	[1]		$ 64.14
Vesting terms			Once on November 30, 2017 (2)
Restricted stock awards [Member] | Employee Stock Plan [Member] | 5/15/2017 | Ratably Over Period [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted			1,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	[1]		$ 64.03
Vesting terms			Ratably over 5 years from grant date
Restricted stock awards [Member] | Employee Stock Plan [Member] | 6/15/2017 | Ratably Over Period [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted			950
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	[1]		$ 66.18
Vesting terms			Ratably over 5 years from grant date
Restricted stock awards [Member] | Employee Stock Plan [Member] | 2/11/2016 | Ratably Over Period [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted				51,475
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	[1]			$ 41.96
Vesting terms				Ratably over 5 years from grant date
Restricted stock awards [Member] | Employee Stock Plan [Member] | 3/1/2016 | Ratably Over Period [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted				600
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	[1]			$ 44.37
Vesting terms				Ratably over 5 years from grant date
Restricted stock awards [Member] | Employee Stock Plan [Member] | 5/24/2016 | Ratably Over Period [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted				8,700
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	[1]			$ 48.34
Vesting terms				Once on May 24, 2021 (3)
Restricted stock awards [Member] | Employee Stock Plan [Member] | 9/19/2016 | At The End of Period [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted				800
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	[1]			$ 52.92
Vesting terms				Ratably over 5 years from grant date
Restricted stock awards [Member] | Employee Stock Plan [Member] | 11/7/2016 | At The End of Period [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted				500
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	[1]			$ 54.28
Vesting terms				Ratably over 5 years from grant date
Restricted stock awards [Member] | Non Employee Director Stock Plan Member | 3/31/2017 | At The End of Period [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted			500
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	[1]		$ 65.63
Vesting terms	[3]		Ratably over 5 years from grant date
Restricted stock awards [Member] | Non Employee Director Stock Plan Member | 5/23/2017 | At The End of Period [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted			7,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	[1]		$ 61.95
Vesting terms			At the end of 5 years from grant date (3)
Restricted stock awards [Member] | Non Employee Director Stock Plan Member | 11/14/2016 | At The End of Period [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted				725
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	[1]			$ 63.43
Vesting terms	[3]			Once on May 24, 2021 (3)
Performance Shares [Member] | Employee Stock Plan [Member] | 2/15/2018 | At The End of Period [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted		16,300
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	[1]	$ 71.75
Vesting terms		The earlier of: the date on which it is determined if the performance goal has been achieved; or, March 31, 2021.
Performance Shares [Member] | Employee Stock Plan [Member] | 2/16/2017 | At The End of Period [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted			14,400
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	[1]		$ 63.10
Vesting terms			The earlier of: the date on which it is determined if the performance goal has been achieved; or, March 31, 2020.
Performance Shares [Member] | Employee Stock Plan [Member] | 2/11/2016 | At The End of Period [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted				20,450
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	[1]			$ 41.96
Vesting terms				The earlier of: the date on which it is determined if the performance goal has been achieved; or, March 31, 2019.
[1]	The fair value of the restricted stock awards are based upon the average of the high and low prices at which the Company’s common stock traded on the date of grant. The holders of time-vested restricted stock awards participate fully in the rewards of stock ownership of the Company, including voting and dividend rights. The holders of performance-based restricted stock awards do not participate in the rewards of stock ownership of the Company until vested. The holders of all restricted stock awards are not required to pay any consideration to the Company for the awards.
[2]	This restricted stock grant fully vested upon an employee's termination, on November 30, 2017.
[3]	These restricted stock grants will vest on May 24, 2021, or earlier if the director ceases to be a director for any reason other than cause, such as, for example, by retirement.

FV OF RSA VESTS (Details 7)

FV OF RSA VESTS (Details 7) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Restricted stock awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of restricted stock awards upon vesting	$ 6,277	$ 5,717	$ 3,019

RSA ROLLFORWARD (Details 8)

RSA ROLLFORWARD (Details 8) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)$ / sharesshares
Oustanding (in shares):
Beginning balance	177,191
Ending balance	153,459
Restricted stock awards [Member]
Oustanding (in shares):
Beginning balance	225,965
Granted	64,490
Vested/Released	(86,219)
Forfeited	(2,130)
Ending balance	202,106	[1]
Weighted Average Grant Price (in usd per share):
Beginning balance | $ / shares	$ 46.18
Granted | $ / shares	72.28
Vested/Released | $ / shares	43.39
Forfeited | $ / shares	53.78
Ending balance | $ / shares	$ 55.62
Unrecognized compensation cost (inclusive of directors’ fees) | $	$ 6,911
Weighted average remaining recognition period (years)	2 years 11 months 15 days
[1]	Inclusive of 23,385

STOCK BASED COMPENSATION (Detai

STOCK BASED COMPENSATION (Details Textual) - $ / shares		12 Months Ended
		Dec. 31, 2018		Dec. 31, 2016	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number		153,459			177,191
Share Based Compensation Arrangement By Share Based Payment Award Options Price Per Share Common Stock Average High And Low Price Intrinsic Value		$ 69.72
Stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number		54,500	[1]		84,000
Options outstanding and expected to vest at December 31, 2018	[2]	54,500
Annualized estimated forfeitures				4.50%
Options exercisable at December 31, 2018	[3]	51,168
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares		3,332			4,999
Weighted average remaining recognition period (years)		1 year
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number		202,106	[4]		225,965
Weighted average remaining recognition period (years)		2 years 11 months 15 days
Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number		32,500
Options outstanding and expected to vest at December 31, 2018	[1]	32,500
Options exercisable at December 31, 2018	[1]	29,168
Director [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number		23,385
Two Thousand Eighteen Nonemployee Director Stock Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized		300,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	[5]	294,000
Two Thousand Five Amended and Restated Employee Stock Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized		1,650,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant		511,811
Two Thousand Ten Nonemployee Director Stock Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized		314,600
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	[5]	174,855
[1]	Inclusive of 32,500
[2]	Inclusive of 32,500 vested stock options and expected to vest to Directors.
[3]	Inclusive of 29,168
[4]	Inclusive of 23,385
[5]	The Company may award up to a total of 300,000 shares from the 2018 Plan, inclusive of 174,855

Derivatives and Hedging Activ_3

Derivatives and Hedging Activities (Derivative Positions for Interest Rate Swaps which Qualify as Hedges) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Details of derivative positions for interest rate swaps which qualify as hedges for accounting purposes
Derivative, Cap Interest Rate	3.02%
Derivative, Floor Interest Rate	2.51%
Amortization Of Deferred Hedge Gains Losses	$ 231,000	$ 244,000	$ 244,000
Notional amount of fair value hedged derivative	$ 0	$ 0	$ 0
Interest rate swaps on borrowings [Member]
Derivatives, Fair Value [Line Items]
Derivative, Average Remaining Maturity	3 years 2 months 4 days	3 years 4 months 13 days
Derivative, Average Variable Interest Rate	2.74%	1.54%
Details of derivative positions for interest rate swaps which qualify as hedges for accounting purposes
Notional Amount	$ 75,000,000	$ 100,000,000
Fair Value	$ 2,282,000	$ 1,616,000
Derivative, Average Fixed Interest Rate	1.53%	1.89%
Interest rate swaps on loans [Member]
Derivatives, Fair Value [Line Items]
Derivative, Average Remaining Maturity	4 years 6 months 7 days
Derivative, Average Variable Interest Rate	2.57%
Details of derivative positions for interest rate swaps which qualify as hedges for accounting purposes
Notional Amount	$ 250,000,000
Fair Value	$ 2,938,000
Derivative, Average Fixed Interest Rate	2.67%
Interest rate collars on loans [Member]
Derivatives, Fair Value [Line Items]
Derivative, Average Remaining Maturity	4 years 2 months 1 day
Derivative, Average Variable Interest Rate	2.47%
Details of derivative positions for interest rate swaps which qualify as hedges for accounting purposes
Notional Amount	$ 250,000,000
Fair Value	3,344,000
Interest Rate Swap [Member]
Details of derivative positions for interest rate swaps which qualify as hedges for accounting purposes
Notional Amount	575,000,000	$ 100,000,000
Fair Value	$ 8,564,000	$ 1,616,000

Derivatives and Hedging Activ_4

Derivatives and Hedging Activities (Customer Related Derivative Positions - Not Designated as Hedges) (Details) - Not Designated as Hedging Instrument [Member] $ in Thousands	Dec. 31, 2018USD ($)position	Dec. 31, 2017USD ($)position
Receive fixed, pay variable | Loan level swaps
Summary of customer related derivative positions, not designated as hedging
Number of Positions (1) | position	235	246
Less than 1 year	$ 50,702	$ 36,023
Less than 2 years	124,222	61,500
Less than 3 years	97,904	152,287
Less than 4 years	47,308	111,147
Thereafter	631,471	591,385
Total	951,607	952,342
Fair Value	$ (2,907)	$ 3,875
Pay fixed, receive variable | Loan level swaps
Summary of customer related derivative positions, not designated as hedging
Number of Positions (1) | position	220	231
Less than 1 year	$ 50,702	$ 36,023
Less than 2 years	124,222	61,500
Less than 3 years	97,904	152,287
Less than 4 years	47,308	111,147
Thereafter	631,471	591,385
Total	951,607	952,342
Fair Value	$ 2,903	$ (3,880)
Buys foreign currency, sells U.S. currency | Foreign exchange contracts
Summary of customer related derivative positions, not designated as hedging
Number of Positions (1) | position	27	15
Less than 1 year	$ 60,297	$ 26,382
Less than 2 years	3,505	3,780
Total	63,802	30,162
Fair Value	$ (1,404)	$ 1,202
Buys U.S. currency, sells foreign currency | Foreign exchange contracts
Summary of customer related derivative positions, not designated as hedging
Number of Positions (1) | position	27	15
Less than 1 year	$ 60,297	$ 26,382
Less than 2 years	3,505	3,780
Total	63,802	30,162
Fair Value	$ 1,434	$ (1,188)

Derivatives and Hedging Activ_5

Derivatives and Hedging Activities (FV of Derivative Financial Instruments and Classification on Balance Sheet) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Fair value of derivative financial instruments as well as their classification on the balance sheet
Total	$ 26,113	$ 17,318
Total	17,523	15,693
Other Assets [Member]
Fair value of derivative financial instruments as well as their classification on the balance sheet
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	17,355	15,596
Total	26,310	17,476
Other Liabilities [Member]
Fair value of derivative financial instruments as well as their classification on the balance sheet
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value	17,132	15,429
Total	17,523	15,693
Interest rate derivatives | Derivatives designated as hedges: [Member] | Other Assets [Member]
Fair value of derivative financial instruments as well as their classification on the balance sheet
Interest Rate Derivative Assets, at Fair Value	8,955	1,880
Interest rate derivatives | Derivatives designated as hedges: [Member] | Other Liabilities [Member]
Fair value of derivative financial instruments as well as their classification on the balance sheet
Interest rate derivatives	391	264
Loan level swaps | Other Assets [Member]
Fair value of derivative financial instruments as well as their classification on the balance sheet
Total	15,580	14,236
Loan level swaps | Other Liabilities [Member]
Fair value of derivative financial instruments as well as their classification on the balance sheet
Total	15,584	14,241
Foreign exchange contracts | Other Assets [Member]
Fair value of derivative financial instruments as well as their classification on the balance sheet
Total	1,578	1,202
Foreign exchange contracts | Other Liabilities [Member]
Fair value of derivative financial instruments as well as their classification on the balance sheet
Total	1,548	1,188
Mortgage Derivatives | Derivatives not designated as hedges: [Member] | Other Assets [Member]
Fair value of derivative financial instruments as well as their classification on the balance sheet
Interest rate lock commitments	91	149
Forward sales agreements	106	9
Mortgage Derivatives | Derivatives not designated as hedges: [Member] | Other Liabilities [Member]
Fair value of derivative financial instruments as well as their classification on the balance sheet
Interest rate lock commitments	0	0
Forward sales agreements	$ 0	$ 0

Derivatives and Hedging Activ_6

Derivatives and Hedging Activities (Derivative Financial Instruments included in OCI and Current Earnings) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Portion Attributable to Parent			$ 2,170
Derivatives designated as hedges: [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net		$ (441)	(2,520)
Derivatives not designated as hedges: [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Other income	$ 56	(54)	(44)
Other Expense [Member] | Derivatives not designated as hedges: [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Other income	(29)	(21)	(82)
Other Income [Member] | Derivatives not designated as hedges: [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Other income	46	6	73
Mortgage banking income | Derivatives not designated as hedges: [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Increase Decrease In Fair Value Of Unhedged Derivative Instruments Relating To Residential Loans	39	(39)	(35)
Derivatives designated as hedges: [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Portion Attributable to Parent	$ 4,829	$ 443	$ 2,170

Derivatives and Hedging Activ_7

Derivatives and Hedging Activities (Textual) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Derivative [Line Items]
Derivative, Net Liability Position, Aggregate Fair Value	$ 176,000	$ 4,200,000
Increase (Decrease) in Loans Held-for-sale	(51,000)	(113,000)	$ 87,000
Net amortization income	231,000	244,000	244,000
Exposure to Institutional Counterparties	$ 18,400,000	7,100,000
Maximum length of time Company is currently hedging its exposure	5 years 1 month 6 days
Customer related positions	$ 6,400,000	9,500,000
Gain (Loss) on Sales of Loans, Net	3,600,000	4,700,000	6,100,000
Notional amount of fair value hedged derivative	0	$ 0	$ 0
Interest Income [Member]
Derivative [Line Items]
Interest expense	654,000
Interest Expense [Member]
Derivative [Line Items]
Interest expense	$ 872,000

BALANCE SHEET OFFSETTING (Detai

BALANCE SHEET OFFSETTING (Details) - USD ($) $ in Thousands		Dec. 31, 2018	Dec. 31, 2017
Offsetting Liabilities [Line Items]
Total		$ 26,113	$ 17,318
Derivative Asset, Collateral, Obligation to Return Cash, Offset		0	0
Derivative Asset		26,113	17,318
Derivative, Collateral, Obligation to Return Securities	[1]	6,556	5,383
Derivative, Collateral, Obligation to Return Cash		(8,528)	0
Derivative Asset, Fair Value, Amount Offset Against Collateral		11,029	11,935
Total		17,523	15,693
Derivative Liability, Collateral, Right to Reclaim Cash, Offset		0	0
Derivative Liability		17,523	15,693
Derivative, Collateral, Right to Reclaim Securities	[1]	6,556	5,383
Derivative, Collateral, Right to Reclaim Cash		173	3,939
Derivative Liability, Fair Value, Amount Offset Against Collateral		10,794	6,371
Interest Rate Swap [Member]
Offsetting Liabilities [Line Items]
Derivative Asset, Collateral, Obligation to Return Cash, Offset		0	0
Derivative Asset		8,955	1,880
Derivative, Collateral, Obligation to Return Securities		391	805
Derivative, Collateral, Obligation to Return Cash		(5,527)	0
Derivative Asset, Fair Value, Amount Offset Against Collateral		3,037	1,075
Derivative Liability, Collateral, Right to Reclaim Cash, Offset		0	0
Derivative Liability		391	264
Derivative, Collateral, Right to Reclaim Securities		391	0
Derivative, Collateral, Right to Reclaim Cash		0	264
Derivative Liability, Fair Value, Amount Offset Against Collateral		0	0
Loan level swaps
Offsetting Liabilities [Line Items]
Derivative Asset, Collateral, Obligation to Return Cash, Offset		0	0
Derivative Asset		15,580	14,236
Derivative, Collateral, Obligation to Return Securities		6,165	4,578
Derivative, Collateral, Obligation to Return Cash		(3,001)	0
Derivative Asset, Fair Value, Amount Offset Against Collateral		6,414	9,658
Derivative Liability, Collateral, Right to Reclaim Cash, Offset		0	0
Derivative Liability		15,584	14,241
Derivative, Collateral, Right to Reclaim Securities		6,165	5,383
Derivative, Collateral, Right to Reclaim Cash		173	3,675
Derivative Liability, Fair Value, Amount Offset Against Collateral		9,246	5,183
Foreign Exchange Contract [Member]
Offsetting Liabilities [Line Items]
Derivative Asset, Collateral, Obligation to Return Cash, Offset		0	0
Derivative Asset		1,578	1,202
Derivative, Collateral, Obligation to Return Securities		0	0
Derivative, Collateral, Obligation to Return Cash		0	0
Derivative Asset, Fair Value, Amount Offset Against Collateral		1,578	1,202
Derivative Liability, Collateral, Right to Reclaim Cash, Offset		0	0
Derivative Liability		1,548	1,188
Derivative, Collateral, Right to Reclaim Securities		0	0
Derivative, Collateral, Right to Reclaim Cash		0	0
Derivative Liability, Fair Value, Amount Offset Against Collateral		1,548	1,188
Other Assets [Member]
Offsetting Liabilities [Line Items]
Total		26,310	17,476
Other Assets [Member] | Loan level swaps
Offsetting Liabilities [Line Items]
Total		15,580	14,236
Other Assets [Member] | Foreign Exchange Contract [Member]
Offsetting Liabilities [Line Items]
Total		1,578	1,202
Other Assets [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
Offsetting Liabilities [Line Items]
Interest Rate Derivative Assets, at Fair Value		8,955	1,880
Other Liabilities [Member]
Offsetting Liabilities [Line Items]
Total		17,523	15,693
Other Liabilities [Member] | Loan level swaps
Offsetting Liabilities [Line Items]
Total		15,584	14,241
Other Liabilities [Member] | Foreign Exchange Contract [Member]
Offsetting Liabilities [Line Items]
Total		1,548	1,188
Other Liabilities [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
Offsetting Liabilities [Line Items]
Interest rate derivatives		$ 391	264
Customer Repurchase Agreements [Member]
Offsetting Liabilities [Line Items]
Securities Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement			162,679
Securities Sold under Agreements to Repurchase, Asset			0
Securities Sold under Agreements to Repurchase			162,679
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities			0
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Cash			0
Securities Sold under Agreements to Repurchase, Fair Value of Collateral			$ 162,679
[1]	Reflects offsetting derivative positions with the same counterparty.

INCOME TAXES (Details)

INCOME TAXES (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current expense
Federal									$ 25,129	$ 28,852	$ 26,549
State									13,672	9,278	8,883
Total current expense									38,801	38,130	35,432
Deferred expense (benefit)
Federal									(3,080)	7,953	153
State									(1,417)	1,258	(158)
Total deferred expense (benefit)									(4,497)	9,211	(5)
Total expense	$ 8,258	$ 9,969	$ 9,249	$ 6,828	$ 14,915	$ 12,681	$ 10,731	$ 9,014	$ 34,304	$ 47,341	$ 35,427

INCOME TAXES (Details 1)

INCOME TAXES (Details 1) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Computed statutory federal income tax provision									$ 32,744	$ 47,091	$ 39,226
State taxes, net of federal tax benefit									9,633	6,817	5,643
Merger and other related costs (non-deductible)									130	213	210
Change in valuation allowance									49	31	28
Effective Income Tax Rate Reconciliation, Revaluation of Net Deferred Tax Assets									0	1,895	0
New Markets Tax Credits									(3,960)	(3,960)	(6,360)
Increase in cash surrender value of life insurance									(1,160)	(1,445)	(1,431)
Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Amount									(1,030)	(1,253)	(1,641)
Stock-based compensation									(885)	(1,258)	0
Nontaxable interest, net									(566)	(987)	(996)
Other, net									(651)	197	748
Total expense	$ 8,258	$ 9,969	$ 9,249	$ 6,828	$ 14,915	$ 12,681	$ 10,731	$ 9,014	$ 34,304	$ 47,341	$ 35,427
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Computed statutory federal income tax provision									21.00%	35.00%	35.00%
State taxes, net of federal tax benefit									6.18%	5.07%	5.03%
Merger and other related costs (non-deductible)									0.08%	0.16%	0.19%
Change in valuation allowance									0.03%	0.02%	0.02%
Effective Income Tax Rate Reconciliation, Revaluation of Net Deferred Tax Asset, Percent									0.00%	1.41%	0.00%
New Markets Tax Credits									(2.54%)	(2.94%)	(5.67%)
Increase in cash surrender value of life insurance									(0.74%)	(1.07%)	(1.28%)
Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Percent									(0.66%)	(0.93%)	(1.46%)
Stock-based compensation									(0.57%)	(0.94%)	0.00%
Nontaxable interest, net									(0.36%)	(0.73%)	(0.89%)
Other, net									(0.42%)	0.15%	0.67%
Total expense									22.00%	35.20%	31.61%

INCOME TAXES (Details 2)

INCOME TAXES (Details 2) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deferred tax assets
Accrued expenses not deducted for tax purposes	$ 11,922	$ 9,268
Allowance for loan losses	17,764	16,702
Deferred gain on sale leaseback transaction	704	909
Employee and director equity compensation	1,636	1,559
Federal Home Loan Bank borrowings fair value adjustment	15	26
Loan basis difference fair value adjustment	4,761	3,070
Deferred Tax Assets, Operating Loss Carryforwards	170	127
Deferred Tax Assets, Unrealized Losses on Available-for-Sale Securities, Gross	1,850	106
Other	842	527
Gross deferred tax assets	39,664	32,294
Deferred Tax Assets, Valuation Allowance	(170)	(121)
Deferred Tax Assets, Net of Valuation Allowance	39,494	32,173
Deferred tax liabilities
Core deposit and other intangibles	3,803	2,057
Deferred loan fees, net	4,759	4,275
Deferred Tax Liabilities, Derivatives	2,413	524
Fixed assets	5,259	5,270
Goodwill	10,388	10,265
Deferred Tax Liabilities, Prepaid Expenses	3,483	3,056
Other	1,139	1,251
Gross deferred tax liabilities	31,244	26,698
Total net deferred tax asset	$ 8,250	$ 5,475

INCOME TAXES (Details 3)

INCOME TAXES (Details 3) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning Balance	$ 142	$ 111
Increase for current year tax positions	73	31
Ending Balance	$ 215	$ 142

INCOME TAXES (Details Textual)

INCOME TAXES (Details Textual) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Tax Expense related to a change in tax law		$ 0	$ 0	$ 0		$ 0	$ 0	$ 0	$ 0	$ 466,000	$ 0
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount									39,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense									24,000	18,000	$ 11,000
Deferred Tax Assets, Operating Loss Carryforwards	$ 170,000				$ 127,000				$ 170,000	$ 127,000
Computed statutory federal income tax provision									21.00%	35.00%	35.00%
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	53,000				29,000				$ 53,000	$ 29,000	$ 11,000
Net Deferred Tax Asset [Member]
Tax Expense related to a change in tax law	0				1,895,000				71,000	1,900,000
Investments in Low Income Housing Projects [Member]
Tax Expense related to a change in tax law	0				$ 466,000					$ 466,000
Deferred Tax Assets, Operating Loss Carryforwards	$ 170,000								$ 170,000

LOW INCOME HOUSING PROJECT IN_3

LOW INCOME HOUSING PROJECT INVESTMENTS Low Income Housing Project Investments (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017		Dec. 31, 2016
Tax Expense related to a change in tax law		$ 0	$ 0	$ 0		$ 0	$ 0	$ 0	$ 0	$ 466,000		$ 0
Original Investment in Low Income Housing Projects	$ 50,232,000				$ 47,399,000				50,232,000	47,399,000		47,379,000
Amortization Method Qualified Affordable Housing Project Investments	33,681,000				35,225,000				33,681,000	35,225,000		39,606,000
Qualified Affordable Housing Project Investments, Commitment	3,935,000				4,536,000				3,935,000	4,536,000		12,161,000
Affordable Housing Tax Credits and Other Tax Benefits, Amount									5,407,000	5,654,000		5,366,000
Amortization Method Qualified Affordable Housing Project Investments, Amortization									4,377,000	4,402,000	[1]	3,725,000
Income (Loss) from Affordable Housing Projects, Equity Method Investments									$ 1,030,000	1,253,000		$ 1,641,000
Investments in Low Income Housing Projects [Member]
Tax Expense related to a change in tax law	$ 0				$ 466,000					$ 466,000
[1]	The 2017 amount is inclusive of $466,000

EMPLOYEE BENEFIT PLANS (Details

EMPLOYEE BENEFIT PLANS (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Pension Plan [Member]
Multiemployer Plans [Line Items]
Multiemployer Plans, Funded Status [Fixed List]	At least 80 percent	At least 80 percent
FIP/RP Status Pending/Implemented	No
Surcharge Imposed	No
Expiration Date of Collective-Bargaining Agreement	N/A
Minimum Contributions Required for Future Periods	$ 0
Supplemental Executive Retirement Plans [Member]
Multiemployer Plans [Line Items]
Defined Benefit Plan, Benefit Obligation	14,963,000	$ 15,749,000	$ 14,177,000	$ 13,290,000
Defined Benefit Plan, Expected Future Benefit Payment, Year Four	454,000
Contributions paid	434,000	$ 367,000	$ 320,000
Defined Benefit Plan, Expected Future Benefit Payment, Year Five	$ 568,000

Pension Plan Contributions (Det

Pension Plan Contributions (Details) - Pension Plan [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Multiemployer Plans [Line Items]
Cash payment	$ 2,642	$ 6,432	$ 6,245
Multiemployer Plan Year Allocation Four [Member]
Multiemployer Plans [Line Items]
Cash payment	2,000	5,000	4,000
Multiemployer Plan Year Allocation One [Member]
Multiemployer Plans [Line Items]
Cash payment	$ 642
Multiemployer Plan Year Allocation Two [Member]
Multiemployer Plans [Line Items]
Cash payment		$ 1,432
Multiemployer Plan Year Allocation Three [Member]
Multiemployer Plans [Line Items]
Cash payment			$ 2,245

SERP Expense and Contributions

SERP Expense and Contributions paid (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Retirement expense	$ 1,100	$ 1,900	$ 2,000
Supplemental Employee Retirement Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Retirement expense	1,683	1,580	1,513
Contributions paid	$ 434	$ 367	$ 320

Expected future benefit payment

Expected future benefit payments under SERP (Details) - Supplemental Executive Retirement Plans [Member] $ in Thousands	Dec. 31, 2018USD ($)
Defined Benefit Plan Disclosure [Line Items]
2,017	$ 482
2,018	467
2,019	461
2,020	454
2,021	568
2024-2028	$ 5,940

SERP Benefits Table (Details)

SERP Benefits Table (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Change in plan assets
Fair value of plan assets at beginning of year	$ 16,200
Fair value of plan assets at end of year	16,600	$ 16,200
Supplemental Executive Retirement Plans [Member]
Change in accumulated benefit obligation
Benefit obligation at beginning of year	15,749	14,177	$ 13,290
Service cost	459	423	395
Interest cost	533	547	539
Actuarial loss (gain)	(1,344)	969	273
Accumulated benefit obligation at end of year	14,963	15,749	14,177
Defined Benefit Plan, Benefit Obligation, Benefits Paid	(434)	(367)	(320)
Change in plan assets
Employer contribution	434	367	320
Defined Benefit Plan, Plan Assets, Benefits Paid	(434)	(367)	(320)
Funded status at end of year	(14,963)	(15,749)	(14,177)
Assets	0	0	0
Liabilities	(14,963)	(15,749)	(14,177)
Funded status at end of year	(14,963)	(15,749)	(14,177)
Amounts recognized in accumulated other comprehensive income (“AOCI”)
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax	1,705	3,465	2,830
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, Prior Service Cost (Credit), before Tax	770	1,047	1,323
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax	2,475	4,512	4,153
Information for plans with an accumulated benefit obligation in excess of plan assets
Projected benefit obligation	14,963	15,749	14,177
Accumulated benefit obligation	14,963	15,749	14,177
Net periodic benefit cost
Service cost	459	423	395
Interest cost	533	547	539
Amortization of prior service cost	276	276	276
Recognized net actuarial loss	415	334	303
Net periodic benefit cost	1,683	1,580	1,513
Amounts in accumulated other comprehensive income expected to be recognized in net periodic benefit cost over next fiscal year
Net actuarial loss	41	415	338
Net prior service cost	$ 276	$ 276	$ 276
Minimum [Member] | Supplemental Executive Retirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	3.24%	2.48%	2.49%
Amounts in accumulated other comprehensive income expected to be recognized in net periodic benefit cost over next fiscal year
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	2.48%	2.49%	2.49%
Maximum [Member] | Supplemental Executive Retirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	4.09%	3.45%	3.94%
Amounts in accumulated other comprehensive income expected to be recognized in net periodic benefit cost over next fiscal year
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	3.45%	3.94%	4.16%

EMPLOYEE BENEFIT PLANS (Detai_2

EMPLOYEE BENEFIT PLANS (Details Textual)	12 Months Ended
	Dec. 31, 2018USD ($)age	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Defined Contribution Plan Disclosure [Line Items]
Incentive plans and discretionary bonus expense	$ 13,800,000	$ 10,900,000	$ 10,300,000
Employer matching contribution percent	25.00%
Employee contribution percent	6.00%
Nondiscretionary requisite service period	1 year
Defined Contribution Plan, Nondiscretionary Requisite service hours	1,000
Nondiscretionary employer contribution, percent up to social security limit	5.00%
Nondiscretionary employer contribution, percent over social security limit	10.00%
Deferred Compensation Arrangement with Individual, Contributions by Employer	$ 142,000	143,000	142,000
Multiemployer Plans [Abstract]
Significance of contributions percentage	5.00%
Defined benefit plan expense	$ 1,100,000	1,900,000	2,000,000
Postretirement Benefits [Abstract]
Retirement age | age	65
Service period to be eligible for postretirement benefit	10 years
Death benefit	$ 5,000
Supplemental Executive Retirement Plans [Abstract]
Plan assets	16,600,000	16,200,000
401(k) Restoration Plan [Member]
Defined Contribution Plan Disclosure [Line Items]
Defined contribution plan expense	278,000	267,000	425,000
Employee Savings Plan [Member]
Defined Contribution Plan Disclosure [Line Items]
Defined contribution plan expense	5,400,000	5,000,000	4,800,000
Executive Vice President [Member]
Defined Contribution Plan Disclosure [Line Items]
Supplemental Unemployment Benefits, Salary Continuation	$ 287,000	$ 279,000	$ 272,000

Recurring and Nonrecurring basi

Recurring and Nonrecurring basis (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Trading	$ 1,500	$ 1,300
Equity Securities, FV-NI	19,477	0
Debt Securities, Available-for-sale	442,752	447,498
Assets
Disposal Group, Including Discontinued Operation, Mortgage Loans	6,431	4,768
Total	26,113	17,318
Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	0	20,584
U.S. Government agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	32,038	35,430
Agency mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	220,105	215,764
Pooled trust preferred securities issued by banks and insurers
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	1,329	1,640
Small Business Administration Pooled Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	51,927	47,778
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Trading	1,504	1,324
Liabilities
Total recurring fair value measurements	478,951	455,373
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Securities, FV-NI	19,477
Assets
Securities - available for sale		20,584
Fair Value, Measurements, Recurring [Member] | U.S. Government agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	32,038	35,430
Fair Value, Measurements, Recurring [Member] | Agency mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	220,105	215,764
Fair Value, Measurements, Recurring [Member] | Agency collateralized mortgage obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	134,911	122,012
Fair Value, Measurements, Recurring [Member] | State, county, and municipal securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	1,735	2,274
Fair Value, Measurements, Recurring [Member] | Single issuer trust preferred securities issued by banks and insurers
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	707	2,016
Fair Value, Measurements, Recurring [Member] | Pooled trust preferred securities issued by banks and insurers
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	1,329	1,640
Fair Value, Measurements, Recurring [Member] | Small Business Administration Pooled Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	51,927	47,778
Fair Value, Measurements, Recurring [Member] | Loans held for sale
Assets
Disposal Group, Including Discontinued Operation, Mortgage Loans	6,431	4,768
Fair Value, Measurements, Recurring [Member] | Derivative instruments
Assets
Total	26,310	17,476
Fair Value, Measurements, Recurring [Member] | Derivative instruments
Assets
Financial and Nonfinancial Liabilities, Fair Value Disclosure	17,523	15,693
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Trading	1,504	1,324
Liabilities
Total recurring fair value measurements	20,981	21,908
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Securities, FV-NI	19,477
Assets
Securities - available for sale		20,584
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | State, county, and municipal securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale		0
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Small Business Administration Pooled Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	0	0
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
Liabilities
Total recurring fair value measurements	456,641	431,825
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Securities, FV-NI	0
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | U.S. Government agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	32,038	35,430
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Agency mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	220,105	215,764
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Agency collateralized mortgage obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	134,911	122,012
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | State, county, and municipal securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	1,735	2,274
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Single issuer trust preferred securities issued by banks and insurers
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	707	2,016
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Small Business Administration Pooled Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	51,927	47,778
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Loans held for sale
Assets
Securities - available for sale	6,431	4,768
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Derivative instruments
Assets
Total	26,310	17,476
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Derivative instruments
Assets
Financial and Nonfinancial Liabilities, Fair Value Disclosure	17,523	15,693
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Liabilities
Total recurring fair value measurements	1,329	1,640
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Securities, FV-NI	0
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | State, county, and municipal securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale		0
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Pooled trust preferred securities issued by banks and insurers
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	1,329	1,640
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Small Business Administration Pooled Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	0	0
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Other real estate owned and other foreclosed assets
Liabilities
Assets, Fair Value Disclosure	0	612
Fair Value, Measurements, Nonrecurring [Member]
Assets
Assets And Liabilities Fair Value Disclosure Nonrecurring	29,109	34,179
Fair Value, Measurements, Nonrecurring [Member] | Collateral dependent impaired loans
Liabilities
Assets, Fair Value Disclosure	29,109	33,567
Fair Value, Measurements, Nonrecurring [Member] | Other real estate owned and other foreclosed assets
Liabilities
Assets, Fair Value Disclosure		612
Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets
Assets And Liabilities Fair Value Disclosure Nonrecurring	29,109	34,179
Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Collateral dependent impaired loans
Liabilities
Assets, Fair Value Disclosure	$ 29,109	33,567
Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Other real estate owned and other foreclosed assets
Liabilities
Assets, Fair Value Disclosure		$ 612

Level 3 Reconciliation (Details

Level 3 Reconciliation (Details) - Pooled Trust Preferred Securities [Member] - Fair Value, Inputs, Level 3 [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Reconciliation for all assets and liabilities measured at fair value on a recurring basis
Beginning balance	$ 1,640	$ 1,584	$ 1,572
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, (Sales), Issuances, (Settlements)	(502)	(21)	(17)
Sales	191	77	29
Ending Balance	$ 1,329	$ 1,640	$ 1,584

Unobservable Inputs (Details)

Unobservable Inputs (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)
Fair Value, Assets, Quantitative Information [Line Items]
Debt Securities, Available-for-sale	$ 442,752	$ 447,498
Weighted Average [Member] | Discounted cash flow methodology [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets, Quantitative Information [Line Items]
Cumulative Default	16.20%	12.40%
Loss Given Default	94.80%	94.30%
Cure Given Default	60.90%	60.90%
Pooled Trust Preferred Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets, Quantitative Information [Line Items]
Debt Securities, Available-for-sale	$ 1,329	$ 1,640
Pooled Trust Preferred Securities [Member] | Minimum [Member] | Discounted cash flow methodology [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets, Quantitative Information [Line Items]
Cumulative Default	5.00%	5.00%
Loss Given Default	85.00%	85.00%
Cure Given Default	0.00%	0.00%
Pooled Trust Preferred Securities [Member] | Maximum [Member] | Discounted cash flow methodology [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets, Quantitative Information [Line Items]
Cumulative Default	100.00%	100.00%
Loss Given Default	100.00%	100.00%
Cure Given Default	75.00%	75.00%
Fair Value, Measurements, Recurring [Member] | Impaired Loans [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets, Quantitative Information [Line Items]
Assets, Fair Value Disclosure	$ 29,109	$ 33,567
Fair Value, Measurements, Recurring [Member] | Other real estate owned and other foreclosed assets | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets, Quantitative Information [Line Items]
Assets, Fair Value Disclosure	$ 0	$ 612
Measurement Input, Constant Prepayment Rate [Member] | Weighted Average [Member] | Discounted cash flow methodology [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets, Quantitative Information [Line Items]
Debt Securities, Available-for-sale, Measurement Input	0.021	0.025
Measurement Input, Constant Prepayment Rate [Member] | Pooled Trust Preferred Securities [Member] | Minimum [Member] | Discounted cash flow methodology [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets, Quantitative Information [Line Items]
Debt Securities, Available-for-sale, Measurement Input	0	0
Measurement Input, Constant Prepayment Rate [Member] | Pooled Trust Preferred Securities [Member] | Maximum [Member] | Discounted cash flow methodology [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets, Quantitative Information [Line Items]
Debt Securities, Available-for-sale, Measurement Input	0.59	0.61

Fair value disclosure only tabl

Fair value disclosure only table (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Held-to-maturity	$ 611,490	$ 497,688
Loans and Leases Receivable, Net Amount	6,841,901	6,294,910
Securities held to maturity, fair value	603,640	494,194
Federal Home Loan Bank Stock	15,683	11,597
Bank Owned Life Insurance	160,456	151,528
Liabilities, Fair Value Disclosure [Abstract]
Advances from Federal Home Loan Banks	147,806	53,264
Junior subordinated debentures	76,173	73,073
Subordinated Debt	34,728	34,682
Deposits [Member]
Liabilities, Fair Value Disclosure [Abstract]
Financial Liabilities Book Value	6,716,017	6,084,952
Accrued Liabilities, Fair Value Disclosure	6,716,017	6,084,952
Bank Time Deposits [Member]
Liabilities, Fair Value Disclosure [Abstract]
Financial Liabilities Book Value	711,103	644,301
Accrued Liabilities, Fair Value Disclosure	703,728	639,060
Federal Home Loan Bank Advances [Member]
Liabilities, Fair Value Disclosure [Abstract]
Advances from Federal Home Loan Banks	147,806	53,264
Federal Home Loan Bank Borrowings, Fair Value Disclosure	147,603	52,111
Customer Repurchase Agreements [Member]
Liabilities, Fair Value Disclosure [Abstract]
Customer Repurchase Agreements and other short-term borrowings		162,679
Accrued Liabilities, Fair Value Disclosure		162,679
Junior Subordinated Debt [Member]
Liabilities, Fair Value Disclosure [Abstract]
Junior subordinated debentures	76,173	73,073
Accrued Liabilities, Fair Value Disclosure	73,827	74,680
Subordinated Debt [Member]
Liabilities, Fair Value Disclosure [Abstract]
Subordinated Debt	34,728	34,682
Accrued Liabilities, Fair Value Disclosure	32,509	32,707
Significant Other Observable Inputs (Level 2) [Member] | Deposits [Member]
Liabilities, Fair Value Disclosure [Abstract]
Accrued Liabilities, Fair Value Disclosure	6,716,017	6,084,952
Significant Other Observable Inputs (Level 2) [Member] | Bank Time Deposits [Member]
Liabilities, Fair Value Disclosure [Abstract]
Accrued Liabilities, Fair Value Disclosure	703,728	639,060
Significant Other Observable Inputs (Level 2) [Member] | Federal Home Loan Bank Advances [Member]
Liabilities, Fair Value Disclosure [Abstract]
Federal Home Loan Bank Borrowings, Fair Value Disclosure	147,603
Accrued Liabilities, Fair Value Disclosure		52,111
Significant Other Observable Inputs (Level 2) [Member] | Junior Subordinated Debt [Member]
Liabilities, Fair Value Disclosure [Abstract]
Accrued Liabilities, Fair Value Disclosure	73,827	74,680
Significant Unobservable Inputs (Level 3) [Member] | Customer Repurchase Agreements [Member]
Liabilities, Fair Value Disclosure [Abstract]
Accrued Liabilities, Fair Value Disclosure		162,679
Significant Unobservable Inputs (Level 3) [Member] | Subordinated Debt [Member]
Liabilities, Fair Value Disclosure [Abstract]
Accrued Liabilities, Fair Value Disclosure	32,509	32,707
US Treasury Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Held-to-maturity	1,004	1,006
Securities held to maturity, fair value	1,015	1,035
US Treasury Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets, Fair Value Disclosure [Abstract]
Securities held to maturity, fair value	1,015	1,035
Agency mortgage-backed securities
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Held-to-maturity	252,484	204,768
Securities held to maturity, fair value	250,928	205,823
Agency mortgage-backed securities | Significant Other Observable Inputs (Level 2) [Member]
Assets, Fair Value Disclosure [Abstract]
Securities held to maturity, fair value	250,928	205,823
Agency collateralized mortgage obligations
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Held-to-maturity	332,775	262,998
Securities held to maturity, fair value	326,724	258,408
Agency collateralized mortgage obligations | Significant Other Observable Inputs (Level 2) [Member]
Assets, Fair Value Disclosure [Abstract]
Securities held to maturity, fair value	326,724	258,408
Single issuer trust preferred securities issued by banks and insurers
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Held-to-maturity	1,500	1,500
Securities held to maturity, fair value	1,490	1,529
Single issuer trust preferred securities issued by banks and insurers | Significant Other Observable Inputs (Level 2) [Member]
Assets, Fair Value Disclosure [Abstract]
Securities held to maturity, fair value	1,490	1,529
Small Business Administration Pooled Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Held-to-maturity	23,727	27,416
Securities held to maturity, fair value	23,483	27,399
Small Business Administration Pooled Securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets, Fair Value Disclosure [Abstract]
Securities held to maturity, fair value	0	0
Small Business Administration Pooled Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets, Fair Value Disclosure [Abstract]
Securities held to maturity, fair value	23,483	27,399
Small Business Administration Pooled Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets, Fair Value Disclosure [Abstract]
Securities held to maturity, fair value	0	0
Loans Net Of Allowance For Loan Loses [Member]
Assets, Fair Value Disclosure [Abstract]
Loans and Leases Receivable, Net Amount	6,812,792	6,261,343
Loans, net of allowance for loan losses	6,635,209	6,116,051
Loans Net Of Allowance For Loan Loses [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets, Fair Value Disclosure [Abstract]
Loans, net of allowance for loan losses	6,635,209	6,116,051
Investment in Federal Home Loan Bank Stock [Member]
Assets, Fair Value Disclosure [Abstract]
Federal Home Loan Bank Stock	15,683	11,597
Investment in Federal Home Loan Bank Stock, Fair Value Disclosure	15,683	11,597
Investment in Federal Home Loan Bank Stock [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets, Fair Value Disclosure [Abstract]
Investment in Federal Home Loan Bank Stock, Fair Value Disclosure	0	0
Investment in Federal Home Loan Bank Stock [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets, Fair Value Disclosure [Abstract]
Investment in Federal Home Loan Bank Stock, Fair Value Disclosure	15,683	11,597
Investment in Federal Home Loan Bank Stock [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets, Fair Value Disclosure [Abstract]
Investment in Federal Home Loan Bank Stock, Fair Value Disclosure	0	0
Cash Surrender Value [Member]
Assets, Fair Value Disclosure [Abstract]
Bank Owned Life Insurance	160,456	151,528
Cash Surrender Value, Fair Value Disclosure	160,456	151,528
Cash Surrender Value [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets, Fair Value Disclosure [Abstract]
Cash Surrender Value, Fair Value Disclosure	0	0
Cash Surrender Value [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets, Fair Value Disclosure [Abstract]
Cash Surrender Value, Fair Value Disclosure	160,456	151,528
Cash Surrender Value [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets, Fair Value Disclosure [Abstract]
Cash Surrender Value, Fair Value Disclosure	$ 0	$ 0

REVENUE RECOGNITION (Details)

REVENUE RECOGNITION (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disaggregation of Revenue [Line Items]
Other noninterest income - ASC 606									$ 4,432	$ 4,569	$ 4,273
Total noninterest income in scope of ASC 606									68,709	64,259	61,875
Total noninterest income out of scope of ASC 606									19,796	18,735	20,553
Noninterest Income	$ 23,491	$ 23,264	$ 21,887	$ 19,863	$ 21,914	$ 20,770	$ 21,398	$ 18,912	88,505	82,994	82,428
Deposit Account [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax									18,327	17,822	18,652
Credit Card, Merchant Discount [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax									15,433	13,899	12,842
ATM Charge [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax									2,961	2,938	3,093
Investment Advisory, Management and Administrative Service [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax									23,441	21,644	19,587
Investment Advisory, Retail Investment and Insurance Service [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax									2,714	2,158	2,222
Merchant Processing [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax									$ 1,401	$ 1,229	$ 1,206

REVENUE RECOGNITION CONTRACT WI

REVENUE RECOGNITION CONTRACT WITH CUSTOMER (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Contract with Customer, Asset and Liability [Abstract]
Investment Management Income Receivable	$ 1,893	$ 1,934

Reconciliation of changes in th

Reconciliation of changes in the components of OCI (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax		$ (281)	$ 180
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax		5,548	182	$ 680
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax		1,000	(441)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax		719	(261)
Other Comprehensive Income (Loss), Available-for-sale Securities, Tax, Portion Attributable to Parent		1,422	322	699
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax		7,717	307	1,133
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, Tax		(2,169)	(125)	(453)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax		6,717	748
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax		1,888	305
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax		4,829	443	2,170
Other Comprehensive Income (Loss), before Tax [Abstract]
Change in fair value of securities available for sale, pre tax amount		5,923	996	1,858
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Borrowings Expense, before Tax	[1]			(2,520)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax, Portion Attributable to Parent				3,653
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax		1,521	(995)	(383)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax		372	278	238
Amortization of certain costs included in net periodic retirement costs, pre tax amount		(276)	(276)	(276)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax	[2]	2,169	(441)	131
Total other comprehensive loss, pre tax amount		2,963	(692)	1,952
Other Comprehensive Income (Loss), Tax [Abstract]
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, Tax		1,422	321	710
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Borrowings Expense, Tax	[1]			1,030
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax, Portion Attributable to Parent				(1,483)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, Tax		(428)	407	157
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, Tax		(105)	(113)	(97)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, Tax		(78)	(113)	(113)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax	[2]	(611)	181	(53)
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent		(1,077)	198	(837)
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, after Tax		(4,501)	(675)	(1,148)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent		(4,501)	(677)	(1,133)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Borrowings Expense, Net of Tax	[1]			(1,490)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Portion Attributable to Parent				2,170
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax		1,093	(588)	(226)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax		267	165	141
Amortization of certain costs included in net periodic retirement costs, after tax amount		198	163	163
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	[2]	1,558	(260)	78
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent		1,886	(494)	1,115
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax		0	3	(26)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax		0	(1)	11
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax		0	2	(15)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax, Portion Attributable to Parent		$ (5,923)	$ (999)	$ (1,832)
[1]	Includes the amortization of the remaining balance of a realized but unrecognized gain, net of tax, from the termination of interest rate swaps in 2009. The original gain of $1.4 million , net of tax, was recognized in earnings through December 2018 , the original maturity date of the swap. The balance of this gain was fully amortized into earnings at December 31, 2018 . The balance of the gain was amortized to $137,000 , and $281,000 at December 31, 2017 and 2016
[2]	The amortization of prior service costs is included in the computation of net periodic pension costs as disclosed in Note 15 - Employee Benefit Plans .

Accumlated other comprehensive

Accumlated other comprehensive income table (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018		Dec. 31, 2017		Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Prior Period Reclassification Adjustment	[1]	$ 0
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets		0	[2]	$ 177	[3]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance		(1,831)		(1,337)		$ (2,452)
Total other comprehensive income (loss)		1,886		(494)		1,115
Ending Balance		(1,173)		(1,831)		(1,337)
Unrealized Gain (Loss) on Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Prior Period Reclassification Adjustment		(111)
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets		(831)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance		(504)		173		1,306
Total other comprehensive income (loss)		(4,501)		(677)		(1,133)
Ending Balance		(5,947)		(504)		173
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Prior Period Reclassification Adjustment		205
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets		0
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance				361
Total other comprehensive income (loss)		4,995
Ending Balance						361
Unrealized Gain (Loss) on Cash Flow Hedge
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance		948				(1,955)
Total other comprehensive income (loss)				587		2,316
Ending Balance		6,148		948
Deferred Gain on Hedge Transactions
Accumulated Other Comprehensive Income (Loss) [Line Items]
Prior Period Reclassification Adjustment		29
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets		0
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance		137		281		427
Total other comprehensive income (loss)		(166)		(144)		(146)
Ending Balance		0		137		281
Defined Benefit Postretirement Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Prior Period Reclassification Adjustment		(520)
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets		0
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance		(2,412)		(2,152)		(2,230)
Total other comprehensive income (loss)		1,558		(260)		78
Ending Balance		(1,374)		(2,412)		(2,152)
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Prior Period Reclassification Adjustment	[2]	(397)
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets	[1]	(831)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Total other comprehensive income (loss)		$ 1,886		$ (494)		$ 1,115
[1]	Represents adjustment needed to reflect the cumulative impact on retained earnings for the classification and measurement of investments in equity securities. Pursuant to the Company's adoption of Accounting Standards Update 2016-01, the Company's investments in equity securities will no longer be classified as available for sale, therefore the Company was required to reclassify the net unrealized gain recognized on the change in fair value of these equity securities from other comprehensive income to retained earnings.
[2]	Represents adjustment needed to reflect the cumulative impact on retained earnings for reclassification of the income tax effects attributable to accumulated other comprehensive income, as a result of the Tax Cuts and Jobs Act (the "Tax Act"). Pursuant to the Company's adoption of Accounting Standards Update 2018-02, the Company has elected to reclassify amounts stranded in other comprehensive income to retained earnings.
[3]	Represents adjustment needed to reflect the cumulative impact on retained earnings for previously recognized stock based compensation, which included an adjustment for estimated forfeitures. Pursuant to the Company's adoption of Accounting Standards Update 2016-09, the Company has elected to recognize stock based compensation without inclusion of a forfeiture estimate, and as such has recognized this adjustment to present retained earnings consistent with this election.

OTHER COMPREHENSIVE LOSS (Detai

OTHER COMPREHENSIVE LOSS (Details Textual) - USD ($)	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2009
Equity [Abstract]
Gain on interest rate swaps	$ 137,000	$ 281,000	$ 1,400,000

COMMITMENTS AND CONTINGENCIES F

COMMITMENTS AND CONTINGENCIES Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Commitments to Extend Credit [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance sheet financial instruments	$ 2,639,689	$ 2,443,478
Standby letters of credit [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance sheet financial instruments	16,708	15,534
Deferred standby letter of credit fees [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance sheet financial instruments	$ 122	$ 102

COMMITMENTS AND CONTINGENCIES L

COMMITMENTS AND CONTINGENCIES Lease Commitments (Details 1) $ in Thousands	Dec. 31, 2018USD ($)
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2,017	$ 9,455
2,018	9,125
2,019	7,617
2,020	6,610
2,021	4,561
Thereafter	11,556
Total future minimum rentals	$ 48,924

COMMITMENTS AND CONTINGENCIES_2

COMMITMENTS AND CONTINGENCIES (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating Leases, Rent Expense, Net [Abstract]
Operating lease rent expense	$ 9.7	$ 8.6	$ 8.5
Reserve requirement	$ 53.5	$ 35.8
Minimum [Member]
Operating Leases, Rent Expense, Net [Abstract]
Operating lease renewal period option	5 years
Maximum [Member]
Operating Leases, Rent Expense, Net [Abstract]
Operating lease renewal period option	10 years

REGULATORY CAPITAL REQUIREMEN_3

REGULATORY CAPITAL REQUIREMENTS (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Company (consolidated) [Member]
Total capital (to risk weighted assets):
Actual	$ 992,454	$ 886,807
Actual Ratio	14.45%	13.82%
Capital Required for Capital Adequacy	$ 549,297	$ 513,398
For Capital Adequacy Purposes Ratio	8.00%	8.00%
Common Equity Tier One Capital	$ 818,176	$ 718,995
Common Equity tier One Capital to Risk Weighted Assets	11.92%	11.20%
Common Equity Tier One Capital Required for Capital Adequacy	$ 308,980	$ 288,787
Common Equity Tier One Capital for Capitalized Adequacy to Risk Weighted Assets	4.50%	4.50%
Tier 1 capital (to risk weighted assets):
Actual	$ 892,176	$ 789,992
Actual Ratio	12.99%	12.31%
For Capital Adequacy Purposes	$ 411,973	$ 385,049
For Capital Adequacy Purposes Ratio	6.00%	6.00%
Tier 1 capital (to average assets):
Actual	$ 892,176	$ 789,992
Actual Ratio	10.69%	10.04%
For Capital Adequacy Purposes	$ 333,754	$ 314,756
For Capital Adequacy Purposes Ratio	4.00%	4.00%
Bank [Member]
Total capital (to risk weighted assets):
Actual	$ 937,574	$ 846,147
Actual Ratio	13.66%	13.19%
Capital Required for Capital Adequacy	$ 549,036	$ 513,175
For Capital Adequacy Purposes Ratio	8.00%	8.00%
To Be Well Capitalized Under Prompt Corrective Action Provisions	$ 686,295	$ 641,469
To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio	10.00%	10.00%
Common Equity Tier One Capital	$ 872,024	$ 784,014
Common Equity tier One Capital to Risk Weighted Assets	12.71%	12.22%
Common Equity Tier One Capital Required for Capital Adequacy	$ 308,833	$ 288,661
Common Equity Tier One Capital for Capitalized Adequacy to Risk Weighted Assets	4.50%	4.50%
Common Equity Tier 1 Capital to be Well Capitalized	$ 446,092	$ 416,955
Common Equity Tier One Capital to be Well Capitalized to Risk Weighted Assets	6.50%	6.50%
Tier 1 capital (to risk weighted assets):
Actual	$ 872,024	$ 784,014
Actual Ratio	12.71%	12.22%
For Capital Adequacy Purposes	$ 411,777	$ 384,881
For Capital Adequacy Purposes Ratio	6.00%	6.00%
To Be Well Capitalized Under Prompt Corrective Action Provisions	$ 549,036	$ 513,175
To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio	8.00%	8.00%
Tier 1 capital (to average assets):
Actual	$ 872,024	$ 784,014
Actual Ratio	10.46%	9.97%
For Capital Adequacy Purposes	$ 333,595	$ 314,630
For Capital Adequacy Purposes Ratio	4.00%	4.00%
To Be Well Capitalized Under Prompt Correction Action Provisions	$ 416,994	$ 393,288
To Be Well Capitalized Under Prompt Correction Action Provisions Ratio	5.00%	5.00%

REGULATORY CAPITAL REQUIREMEN_4

REGULATORY CAPITAL REQUIREMENTS Regulatory Capital Requirements (Details Textual) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Dividends received from subsidiaries(1)	$ (71.2)	$ (46.9)
Junior Subordinated Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 74	$ 71

Parent Company Balance Sheet (D

Parent Company Balance Sheet (Details) - USD ($) $ in Thousands		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Assets:
Deferred tax asset		$ 39,494	$ 32,173
Derivative Asset		26,113	17,318
Other Assets		132,507	123,119
Total assets		8,851,592	8,082,029
Liabilities and stockholders’ equity
Junior subordinated debentures		76,173	73,073
Subordinated Debt		34,728	34,682
Other liabilities		92,275	85,269
Total liabilities		7,778,102	7,138,220
Stockholders’ equity		1,073,490	943,809	$ 864,690	$ 771,463
Liabilities and Equity		8,851,592	8,082,029
Parent Company [Member]
Assets:
Cash	[1]	64,256	48,131
Investments in subsidiaries	[2]	1,128,407	1,010,125
Prepaid income taxes		1,014	786
Deferred tax asset			96
Derivative Asset	[1]	1,711	1,535
Other Assets		37	0
Total assets		1,195,425	1,060,673
Liabilities and stockholders’ equity
Dividends payable		10,671	8,786
Junior subordinated debentures		76,173	73,073
Subordinated Debt		34,728	34,682
Other liabilities		363	323
Total liabilities		121,935	116,864
Stockholders’ equity		1,073,490	943,809
Liabilities and Equity		$ 1,195,425	$ 1,060,673
[1]	Entire balance eliminates in consolidation.
[2]	eliminates in consolidation

Parent Company Income Statement

Parent Company Income Statement (Details) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
		Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Condensed Financial Statements, Captions [Line Items]
Derivative Asset		$ 26,113				$ 17,318				$ 26,113	$ 17,318
Expenses
Interest expense		7,618	$ 6,641	$ 5,999	$ 5,278	5,044	$ 4,705	$ 4,378	$ 4,207	25,536	18,334	$ 18,793
Income tax benefit		8,258	9,969	9,249	6,828	14,915	12,681	10,731	9,014	34,304	47,341	35,427
Net Income		29,934	$ 33,015	$ 31,118	$ 27,555	22,064	$ 23,852	$ 20,563	$ 20,725	121,622	87,204	76,648
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Dividend Income, Operating	[1]									71,255	47,006	44,598
Derivative Asset	[2]	$ 1,711				$ 1,535				1,711	1,535
Income
Interest income(2)	[3]										50	98
Total income										71,255	47,056	44,696
Expenses
Interest expense										4,234	3,995	5,901
Total expenses										4,234	3,995	5,901
Income before income taxes and equity in undistributed income of subsidiaries										67,021	43,061	38,795
Income tax benefit										(1,151)	(1,523)	(1,791)
Income of parent company										68,172	44,584	40,586
Equity in undistributed income of subsidiaries										53,450	42,620	36,062
Net Income										$ 121,622	$ 87,204	$ 76,648
[1]	eliminates in consolidation.
[2]	Entire balance eliminates in consolidation.
[3]	Entire balance eliminated in consolidation.

Parent Company Cash Flow Statem

Parent Company Cash Flow Statement (Details) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
		Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Condensed Financial Statements, Captions [Line Items]
Net income		$ 29,934	$ 33,015	$ 31,118	$ 27,555	$ 22,064	$ 23,852	$ 20,563	$ 20,725	$ 121,622	$ 87,204	$ 76,648
Adjustments to reconcile net income to net cash provided by operating activities
Deferred income tax expense										(4,497)	9,211	(5)
Change in other liabilities										7,100	(3,825)	(8,738)
Net cash provided by operating activities										141,837	130,909	92,899
Cash flows used in investing activities
Net cash used in investing activities										(387,511)	(316,769)	(238,886)
Cash flows provided by financing activities
Restricted stock awards issued, net of awards surrendered										(1,371)	(1,422)	(696)
Cash received from stock option exercises										184	214	201
Proceeds from shares issued under the direct stock purchase plan										2,712	1,636	2,323
Common dividends paid										(40,167)	(34,045)	(29,711)
Net cash provided by financing activities										283,013	109,881	159,317
Net increase (decrease) in cash and cash equivalents										37,339	(75,979)	13,330
Cash and cash equivalents at beginning of year					213,116				289,095	213,116	289,095	275,765
Cash and cash equivalents at end of period		250,455				213,116				250,455	213,116	289,095
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Investments in subsidiaries	[1]	1,128,407				1,010,125				1,128,407	1,010,125
Net income										121,622	87,204	76,648
Adjustments to reconcile net income to net cash provided by operating activities
Amortization (accretion)										54	12	(154)
Deferred income tax expense										49	51	678
Change in prepaid income taxes and other assets										135	(99)	423
Change in other liabilities										6	(562)	(5,532)
Equity in undistributed income of subsidiaries										(53,450)	(42,620)	(36,062)
Net cash provided by operating activities										68,416	43,986	36,001
Cash flows used in investing activities
Cash paid for acquisitions, net of cash acquired (1)	[2]									(13,649)	(4,834)	(950)
Net cash used in investing activities										(13,649)	(4,834)	(950)
Cash flows provided by financing activities
Restricted stock awards issued, net of awards surrendered										(1,371)	(1,422)	(696)
Cash received from stock option exercises										184	214	201
Proceeds from shares issued under the direct stock purchase plan										2,712	1,636	2,323
Common dividends paid										(40,167)	(34,045)	(29,711)
Net cash provided by financing activities										(38,642)	(33,617)	(27,883)
Net increase (decrease) in cash and cash equivalents										16,125	5,535	7,168
Cash and cash equivalents at beginning of year					$ 48,131				$ 42,596	48,131	42,596	35,428
Cash and cash equivalents at end of period		64,256				48,131				64,256	48,131	$ 42,596
Cash	[3]	$ 64,256				$ 48,131				$ 64,256	$ 48,131
[1]	eliminates in consolidation
[2]	The majority of the net assets acquired at the parent company represented each of the acquired companies' investments in their wholly owned subsidiaries, which were eliminated in consolidation at December 31, 2018 , 2017 , and 2016
[3]	Entire balance eliminates in consolidation.

SELECTED QUARTERLY FINANCIAL _3

SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Interest income	$ 87,910,000	$ 82,875,000	$ 79,167,000	$ 73,749,000	$ 72,876,000	$ 71,778,000	$ 68,133,000	$ 64,407,000	$ 323,701,000	$ 277,194,000	$ 246,637,000
Interest expense	7,618,000	6,641,000	5,999,000	5,278,000	5,044,000	4,705,000	4,378,000	4,207,000	25,536,000	18,334,000	18,793,000
Net interest income	80,292,000	76,234,000	73,168,000	68,471,000	67,832,000	67,073,000	63,755,000	60,200,000	298,165,000	258,860,000	227,844,000
Provision (benefit)	1,200,000	1,075,000	2,000,000	500,000	1,300,000	0	1,050,000	600,000	4,775,000	2,950,000	6,075,000
Total noninterest income	23,491,000	23,264,000	21,887,000	19,863,000	21,914,000	20,770,000	21,398,000	18,912,000	88,505,000	82,994,000	82,428,000
Total noninterest expenses	64,391,000	55,439,000	52,688,000	53,451,000	51,467,000	51,310,000	52,809,000	48,773,000	225,969,000	204,359,000	192,122,000
Provision for income taxes	8,258,000	9,969,000	9,249,000	6,828,000	14,915,000	12,681,000	10,731,000	9,014,000	34,304,000	47,341,000	35,427,000
Net Income	$ 29,934,000	$ 33,015,000	$ 31,118,000	$ 27,555,000	$ 22,064,000	$ 23,852,000	$ 20,563,000	$ 20,725,000	$ 121,622,000	$ 87,204,000	$ 76,648,000
Basic earnings per share (in dollars per share)	$ 1.08	$ 1.20	$ 1.13	$ 1	$ 0.80	$ 0.87	$ 0.75	$ 0.77	$ 4.41	$ 3.19	$ 2.90
Diluted earnings per share (in dollars per share)	$ 1.07	$ 1.20	$ 1.13	$ 1	$ 0.80	$ 0.87	$ 0.75	$ 0.76	$ 4.40	$ 3.19	$ 2.90
Weighted average common shares (basic) (in shares)	27,815,437	27,537,841	27,526,653	27,486,573	27,445,739	27,436,792	27,257,799	27,029,640	27,592,380	27,294,028	26,404,071
Common share equivalents (in shares)	58,576	63,499	54,525	67,381	77,615	76,307	74,497	81,283	61,428	78,076	51,847
Weighted average common shares (diluted) (in shares)	27,874,013	27,601,340	27,581,178	27,553,954	27,523,354	27,513,099	27,332,296	27,110,923	27,653,808	27,372,104	26,455,918
Acquisition Related Costs	$ 8,046,000	$ 2,688,000	$ 434,000	$ 0		$ 0	$ 2,909,000	$ 484,000	$ 11,168,000	$ 3,393,000	$ 5,455,000
Tax Expense related to a change in tax law		0	0	0		0	0	0	0	466,000	$ 0
Total unusual or infrequent expense items	8,046,000	$ 2,688,000	$ 434,000	$ 0	$ 2,361,000	$ 0	$ 2,909,000	$ 484,000
Net Deferred Tax Asset [Member]
Tax Expense related to a change in tax law	0				1,895,000				$ 71,000	1,900,000
Investments in Low Income Housing Projects [Member]
Tax Expense related to a change in tax law	$ 0				$ 466,000					$ 466,000

TRANSACTIONS WITH RELATED PAR_3

TRANSACTIONS WITH RELATED PARTIES (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017		Dec. 31, 2016
Related Party Transaction [Line Items]
Loans and Leases Receivable, Related Parties	$ 41,170	$ 52,458		$ 22,795
Loans and Leases Receivable, Related Parties, Additions	14,862	36,800	[1]
Loans and Leases Receivable, Related Parties, Collections	(14,057)	(7,137)
Loans and Leases Receivable, Related Parties, Period Increase (Decrease)	$ (12,093)	$ 0
[1]	The 2017 amount includes $31.3 million

TRANSACTIONS WITH RELATED PAR_4

TRANSACTIONS WITH RELATED PARTIES Related Parties Textual (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017		Dec. 31, 2016
Related Party Transaction [Line Items]
Loans and Leases Receivable, Related Parties, Additions	$ 14,862,000	$ 36,800,000	[1]
Related Party Transaction, Amounts of Transaction	31,300,000
Operating Leases, Rent Expense	9,700,000	8,600,000		$ 8,500,000
Related Party Deposit Liabilities	10,800,000	$ 18,300,000
Affiliated Entity [Member]
Related Party Transaction [Line Items]
Operating Leases, Rent Expense	$ 0			$ 0
[1]	The 2017 amount includes $31.3 million