Independent Bank (INDB) 10-Q 7 May 20 2019 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2020	May 06, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Entity Information [Line Items]
Document Transition Report	false
City Area Code	(781)
Entity Incorporation, State or Country Code	MA
Entity File Number	1-9047
Document Quarterly Report	true
Entity Registrant Name	Independent Bank Corp.
Entity Tax Identification Number	04-2870273
Entity Central Index Key	0000776901
Document Type	10-Q
Document Period End Date	Mar. 31, 2020
Amendment Flag	false
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q1
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		32,934,656
Local Phone Number	878-6100
Entity Address, Address Line One	2036 Washington Street,
Entity Address, City or Town	Hanover,
Entity Address, State or Province	MA
Entity Address, Postal Zip Code	02339
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Shell Company	false
NASDAQ/NGS (GLOBAL SELECT MARKET) [Member]
Entity Information [Line Items]
Security Exchange Name	NASDAQ
Title of 12(b) Security	Common Stock, $0.01 par value per share
Trading Symbol	INDB
Common Class A [Member]
Entity Information [Line Items]
Common Stock, Shares, Outstanding	33,260,005		34,377,388	28,137,504	28,080,408
Mailing Address [Member]
Entity Information [Line Items]
Entity Address, Address Line One	288 Union Street,
Entity Address, City or Town	Rockland,
Entity Address, State or Province	MA
Entity Address, Postal Zip Code	02370

Consolidated Balance Sheets (Un

Consolidated Balance Sheets (Unaudited) - USD ($)	Mar. 31, 2020	Dec. 31, 2019
Assets
Cash and due from banks	$ 125,638,000	$ 114,686,000
Interest-earning deposits with banks	345,739,000	36,288,000
Securities
Trading	2,247,000	2,179,000
Equity Securities, FV-NI	19,439,000	21,261,000
Debt Securities, Available-for-sale	437,296,000	426,424,000
Held to maturity (fair value $809,355 and $753,263)	777,798,000	740,806,000
Total securities	1,236,780,000	1,190,670,000
Loans Receivable Held-for-sale, Net, Not Part of Disposal Group	43,756,000	33,307,000
Loans
Total loans	8,916,430,000	8,873,639,000
Less: allowance for credit losses	(92,376,000)	(67,740,000)
Net loans	8,824,054,000	8,805,899,000
Federal Home Loan Bank stock	23,274,000	14,424,000
Bank premises and equipment, net	121,873,000	123,674,000
Goodwill	506,206,000	506,206,000
Other intangible assets	27,466,000	29,286,000
Cash surrender value of life insurance policies	197,772,000	197,372,000
Other assets	527,682,000	343,353,000
Total assets	11,980,240,000	11,395,165,000
Deposits
Noninterest-bearing demand deposits	2,820,312,000	2,662,591,000
Savings and interest checking accounts	3,428,546,000	3,232,909,000
Money market	1,897,632,000	1,856,552,000
Time certificates of deposit of $100,000 and over	629,528,000	663,645,000
Other time certificates of deposits	640,180,000	731,670,000
Total deposits	9,416,198,000	9,147,367,000
Borrowings
Federal Home Loan Bank borrowings	358,591,000	115,748,000
Long-term Debt	74,920,000	74,906,000
Junior Subordinated Notes	62,849,000	62,848,000
Subordinated debentures (less unamortized debt issuance costs of $375 and $399)	49,625,000	49,601,000
Total borrowings	545,985,000	303,103,000
Other liabilities	338,401,000	236,552,000
Total liabilities	10,300,584,000	9,687,022,000
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: 33,260,005 shares at March 31, 2020 and 34,377,388 shares at December 31, 2019 (includes 147,892 and 147,184 shares of unvested participating restricted stock awards, respectively)	331,000	342,000
Value of shares held in rabbi trust at cost: 133,857 shares at March 31, 2020 and 143,820 shares at December 31, 2019	(4,604,000)	(4,735,000)
Deferred compensation and other retirement benefit obligations	4,604,000	4,735,000
Additional paid in capital	962,513,000	1,035,450,000
Retained earnings	667,084,000	654,182,000
Accumulated other comprehensive income, net of tax	49,728,000	18,169,000
Total stockholders’ equity	1,679,656,000	1,708,143,000
Total liabilities and stockholders' equity	11,980,240,000	11,395,165,000
Commercial And Industrial [Member]
Loans
Financing Receivable, before Allowance for Credit Loss	1,448,224,000	1,395,036,000
Total loans	1,448,224,000	1,395,036,000
Commercial Real Estate [Member]
Loans
Financing Receivable, before Allowance for Credit Loss	4,061,347,000	4,002,359,000
Total loans	4,061,347,000	4,002,359,000
Construction Loans [Member]
Loans
Financing Receivable, before Allowance for Credit Loss	527,138,000	547,293,000
Total loans	527,138,000	547,293,000
Small Business [Member]
Loans
Financing Receivable, before Allowance for Credit Loss	177,820,000	174,497,000
Total loans	177,820,000	174,497,000
Residential Real Estate [Member]
Loans
Financing Receivable, before Allowance for Credit Loss	1,528,416,000	1,590,569,000
Total loans	1,528,416,000	1,590,569,000
Home Equity Loan [Member]
Loans
Total loans	1,146,270,000
Consumer Portfolio Segment [Member]
Loans
Financing Receivable, before Allowance for Credit Loss	27,215,000	30,087,000
Total loans	27,215,000	30,087,000	[1]
Senior Lien [Member] | Home Equity Loan [Member]
Loans
Financing Receivable, before Allowance for Credit Loss	656,994,000	649,255,000
Junior Lien [Member] | Home Equity Loan [Member]
Loans
Financing Receivable, before Allowance for Credit Loss	$ 489,276,000	$ 484,543,000
[1]	(1) Other consumer portfolio is inclusive of deposit account overdrafts recorded as loan balances.

Consolidated Balance Sheets (_2

Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($)	Mar. 31, 2020	Dec. 31, 2019
Time certificates of deposit least amount	$ 100,000	$ 100,000
Held to Maturity, Fair Value, Total	809,355,000	753,263,000
Debt Securities, Available-for-sale, Amortized Cost	$ 419,452,000	$ 420,703,000
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, unvested restricted Stock awards	147,892	147,184
Shares Held in Rabbi Trust	133,857	143,820
Common Stock Outstanding
Common Stock, Shares, Outstanding	33,260,005	34,377,388
Junior Subordinated Debt [Member]
Unamortized Debt Issuance Expense	$ 39,000	$ 40,000
Subordinated Debt [Member]
Unamortized Debt Issuance Expense	375,000	399,000
Short-term Debt [Member]
Unamortized Debt Issuance Expense	0	0
Long-term Debt [Member]
Unamortized Debt Issuance Expense	$ 80,000	$ 94,000

Consolidated Statements of Inco

Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Interest income
Interest and fees on loans	$ 99,022	$ 83,608
Interest Income, Securities, Operating, Taxable	7,957	7,465
Nontaxable interest and dividends on securities	9	13
Interest on loans held for sale	232	31
Interest on federal funds sold and short-term investments	160	426
Total interest and dividend income	107,380	91,543
Interest expense
Interest on deposits	10,892	7,028
Interest on borrowings	2,184	1,990
Total interest expense	13,076	9,018
Net interest income	94,304	82,525
Provision for credit losses	25,000	1,000
Net interest income after provision for credit losses	69,304	81,525
Noninterest income
Deposit account fees	4,970	4,406
Interchange and ATM fees	4,896	4,516
Investment Banking, Advisory, Brokerage, and Underwriting Fees and Commissions	6,829	6,748
Mortgage banking income	861	806
Gain Realized on Life Insurance Policies	(357)	0
Increase in cash surrender value of life insurance policies	1,276	972
Loan level derivative income	3,597	641
Other noninterest income	3,649	3,444
Total noninterest income	26,435	21,533
Noninterest expenses
Salaries and employee benefits	37,349	33,117
Occupancy and equipment expenses	9,317	7,130
Data processing & facilities management	1,658	1,326
FDIC assessment	0	616
Advertising expense	1,105	1,213
Professional Fees	1,336	764
Amortization of Intangible Assets	1,531	857
Business Combination, Acquisition Related Costs	0	1,032
Software Maintenance	1,685	1,165
Debt and Equity Securities, Unrealized Gain (Loss)	1,799	0
Other noninterest expenses	11,060	9,091
Total noninterest expenses	66,840	56,311
Income before income taxes	28,899	46,747
Current Federal, State and Local, Tax Expense (Benefit)	2,148	11,522
Net income	$ 26,751	$ 35,225
Basic earnings per share (in dollars per share)	$ 0.78	$ 1.25
Diluted earnings per share (in dollars per share)	$ 0.78	$ 1.25
Weighted average common shares (basic) (in shares)	34,184,431	28,106,184
Common shares equivalents (in shares)	36,827	54,466
Weighted average common shares (diluted) (in shares)	34,221,258	28,160,650
Retained Earnings [Member]
Noninterest expenses
Net income	$ 26,751	$ 35,225
Cash dividends declared per common share (in dollars per share)	$ 0.46	$ 0.44

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income		$ 26,751	$ 35,225
Other comprehensive income, net of tax
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax		9,347	4,729
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax		22,984	3,285
Net change in other comprehensive income for defined benefit postretirement plans	[1]	(772)	40
Total other comprehensive income		31,559	8,054
Total comprehensive income		$ 58,310	$ 43,279
[1]	The amortization of prior service costs is included in the computation of net periodic pension cost as disclosed in the Employee Benefit Plans footnote in the Company's Annual Report on Form 10-K for the year ended December 31, 2019 , filed with the Securities and Exchange Commission.

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)	Total	Common Stock Outstanding	Common Stock	Value of Shares Held in Rabbi Trust at Cost	Deferred Compensation and Other Retirement Benefit Obligations	Additional Paid in Capital	Retained Earnings	Accumulated Other Comprehensive Income/(Loss)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Shares, Outstanding		28,080,408
Net income	$ 35,225,000						$ 35,225,000
Other comprehensive income	8,054,000							$ 8,054,000
Cash dividends declared per common share (in dollars per share)							$ 0.44
Common dividend declared	(12,379,000)						$ (12,379,000)
Proceeds from exercise of stock options, net of cash paid		6,000
Proceeds from exercise of stock options, net of cash paid	165,000		$ 0			$ 165,000
Stock based compensation	915,000					915,000
Restricted stock awards issued, net of awards surrendered		44,407
Restricted stock awards issued, net of awards surrendered	(1,419,000)		1,000			(1,420,000)
Shares issued under direct stock purchase plan		6,689
Shares issued under direct stock purchase plan	487,000					487,000
Increase (Decrease) in Deferred Compensation and Other Retirement Benefits				$ 119,000	$ (119,000)
Increase (Decrease) in Deferred Compensation	0
Period End Balance at Mar. 31, 2019	1,104,538,000		280,000	(4,599,000)	4,599,000	527,795,000	569,582,000	6,881,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Shares, Outstanding		28,137,504
Common Stock, Shares, Outstanding		34,377,388
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method	(1,137,000)
Net income	26,751,000						$ 26,751,000
Other comprehensive income	31,559,000							31,559,000
Cash dividends declared per common share (in dollars per share)							$ 0.46
Common dividend declared	(15,402,000)						$ (15,402,000)
Stock based compensation	850,000					850,000
Restricted stock awards issued, net of awards surrendered		42,531
Restricted stock awards issued, net of awards surrendered	(1,132,000)		1,000			(1,133,000)
Shares issued under direct stock purchase plan		7,009
Shares issued under direct stock purchase plan	560,000					560,000
Stock Repurchased During Period, Shares		(1,166,923)
Stock Repurchased During Period, Value	(73,226,000)		(12,000)			(73,214,000)
Increase (Decrease) in Deferred Compensation and Other Retirement Benefits				131,000	(131,000)
Increase (Decrease) in Deferred Compensation	0
Period End Balance at Mar. 31, 2020	1,679,656,000		$ 331,000	$ (4,604,000)	$ 4,604,000	$ 962,513,000	$ 667,084,000	$ 49,728,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method, net of tax.	817,000
Off-Balance Sheet, Credit Loss, Liability, Change in Method, Credit Loss Expense (Reversal)	(1,000,000)
Off-Balance Sheet, Credit Loss, Liability, Change in Method, Credit Loss Expense (Reversal), net of tax.	$ 736,000
Common Stock, Shares, Outstanding		33,260,005

Consolidated Statements of St_2

Consolidated Statements of Stockholders' Equity (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019	Dec. 31, 2018
Stockholders' Equity Attributable to Parent	$ 1,679,656	$ 1,104,538	$ 1,708,143	$ 1,073,490
Held In Rabbi Trust At Cost [Member]
Stockholders' Equity Attributable to Parent	$ (4,604)	$ (4,599)	(4,735)	(4,718)
Retained Earnings
Cash dividends declared per common share (in dollars per share)	$ 0.46	$ 0.44
Stockholders' Equity Attributable to Parent	$ 667,084	$ 569,582	654,182	546,736
Deferred Compensation, Share-based Payments [Member]
Stockholders' Equity Attributable to Parent	4,604	4,599	4,735	4,718
AOCI Attributable to Parent [Member]
Stockholders' Equity Attributable to Parent	49,728	6,881	18,169	(1,173)
Common Stock [Member]
Stockholders' Equity Attributable to Parent	331	280	342	279
Additional Paid-in Capital [Member]
Stockholders' Equity Attributable to Parent	$ 962,513	$ 527,795	$ 1,035,450	$ 527,648
Common Class A [Member]
Common Stock, Shares, Outstanding	33,260,005	28,137,504	34,377,388	28,080,408

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (Unaudited) - USD ($)	Jan. 01, 2019		Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2018
CASH FLOWS FROM OPERATING ACTIVITIES:
Net Income			$ 26,751,000	$ 35,225,000
Adjustments to reconcile net income to net cash provided by (used in) operating activities
Depreciation and amortization			6,992,000	4,101,000
Change In Unamortized Net Loan Costs And Premiums			(735,000)	(453,000)
Provision for credit losses			25,000,000	1,000,000
Deferred income tax expense			3,108,000	539,000
Net unrealized (gain) loss on equity securities			1,801,000	(907,000)
Net loss on bank premises and equipment			420,000	25,000
Realized gain on sale leaseback transaction			(145,000)	(145,000)
Stock based compensation			850,000	915,000
Increase in cash surrender value of life insurance policies			(1,276,000)	(972,000)
Gain Realized on Life Insurance Policies			(357,000)	0
Operating Lease, Payments			(2,926,000)	(2,165,000)
Change in Fair Value on Loans Held for Sale			914,000	(1,000)	$ (1,000)
Net change in:
Trading assets			(68,000)	(333,000)
Loans held for sale			(11,363,000)	846,000
Other assets			(151,830,000)	1,721,000
Increase (Decrease) in Other Operating Liabilities			92,461,000	(5,228,000)
Total adjustments			(37,154,000)	(1,057,000)
Net cash provided by (used in) operating activities			(10,403,000)	34,168,000
Cash flows provided by (used in) investing activities
Increase (Decrease) in Equity Securities, FV-NI			(108,000)	(105,000)
Proceeds from maturities and principal repayments of securities available for sale			31,280,000	11,318,000
Payments to Acquire Debt Securities, Available-for-sale			(30,095,000)
Proceeds from maturities and principal repayments of securities held to maturity			48,183,000	19,003,000
Purchases of securities held to maturity			(84,824,000)	(30,502,000)
Net redemption (purchases) of Federal Home Loan Bank stock			(8,850,000)	8,016,000
Investments in low income housing projects			(5,934,000)	(292,000)
Purchases of life insurance policies			(93,000)	(93,000)
Proceeds from Life Insurance Policy			1,326,000	0
Net increase in loans			(41,283,000)	(70,378,000)
Purchases of bank premises and equipment			(1,749,000)	(3,713,000)
Proceeds from the sale of bank premises and equipment			9,000	13,000
Net cash used in investing activities			(92,138,000)	(66,733,000)
Cash flows provided by (used in) financing activities
Net increase (decrease) in time deposits			(125,396,000)	12,464,000
Net increase in other deposits			394,438,000	24,034,000
Increase (Decrease) in Federal Funds Purchased and Securities Sold under Agreements to Repurchase, Net			257,826,000	(122,046,000)
Increase Decrease in Federal Home Loan Bank Advances Long Term			(15,000,000)	0
Proceeds from Lines of Credit			0	49,993,000
Proceeds from long-term debt, net of issuance costs			0	74,914,000
RepaymentsOfJuniorSubordinatedDebt			0	(3,093,000)
Proceeds from Issuance of Subordinated Long-term Debt			0	49,556,000
Net proceeds from exercise of stock options			0	(165,000)
Restricted stock awards issued, net of awards surrendered			(1,132,000)	(1,419,000)
Proceeds from shares issued under direct stock purchase plan			560,000	487,000
Payments for shares repurchased under share repurchase program			(73,226,000)	0
Common dividends paid			(15,126,000)	(10,671,000)
Net cash provided by financing activities			422,944,000	74,384,000
Net increase in cash and cash equivalents			320,403,000	41,819,000
Cash and cash equivalents at beginning of year	$ 250,455,000		150,974,000	250,455,000
Cash and cash equivalents at end of period			471,377,000	292,274,000	250,455,000
Supplemental schedule of noncash activities
Net increase in capital commitments relating to low income housing project investments			14,394,000	0
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	32,800,000	[1]	$ 2,223,000	$ 2,926,000
Operating Lease, Liability	$ 34,100,000
Deferred Rent Credit					$ 1,300,000
[1]	Represents adjustment needed to reflect the opening balance of the Company's Right of Use ("ROU") assets and lease liabilities pursuant to the adoption of Accounting Standards Update 2016-02 effective January 1, 2019. 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 .

Basis of Presentation

Basis of Presentation	3 Months Ended
	Mar. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
BASIS OF PRESENTATION	BASIS OF PRESENTATION Independent Bank Corp. (the “Company”) is a state chartered, federally registered bank holding company, incorporated in 1985. The Company is the sole stockholder of Rockland Trust Company (“Rockland Trust” or the “Bank”), a Massachusetts trust company chartered in 1907. All material intercompany balances and transactions have been eliminated in consolidation. Certain previously reported amounts have been reclassified to conform to the current year’s presentation. The accompanying unaudited consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP") for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and notes required by GAAP for complete financial statements. In the opinion of management, all adjustments considered necessary for a fair presentation of the financial statements, primarily consisting of normal recurring adjustments, have been included. Results for the quarter ended March 31, 2020 are not necessarily indicative of the results that may be expected for the year ending December 31, 2020 or any other interim period. For further information, refer to the consolidated financial statements and notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2019 , filed with the Securities and Exchange Commission.

Recent Accounting Standards

Recent Accounting Standards	3 Months Ended
	Mar. 31, 2020
Recent Accounting Standards [Abstract]
RECENT ACCOUNTING STANDARDS	RECENT ACCOUNTING STANDARDS UPDATES Financial Accounting Standards Board ("FASB") Accounting Standards Codification ("ASC") Topic 326 "Financial Instruments - Credit Losses" Update No. 2016-13. The standard was issued in June 2016 and has been amended three times by the FASB (collectively, the "updates"). The purpose of the updates is 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, these updates replace the incurred loss impairment methodology in current GAAP with a methodology, referred to as the current expected credit losses ("CECL") methodology, that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to inform credit loss estimates. The updates 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 adopted the CECL standard effective January 1, 2020. The Company adopted the standard using the modified retrospective method for all financial assets measured at amortized cost, net investment in leases and off-balance sheet credit exposures. Results for reporting periods beginning after January 1, 2020 are presented under the CECL standard, while prior period results are presented under standards previously applicable under GAAP. The cumulative effect of the Company's adoption resulted in an immaterial increase to retained earnings as of the January 1, 2020 adoption date. This transition adjustment was a result of the change in allowance methodology, including the impact to the reserve on unfunded commitments resulting from the application of new guidance under CECL, as well as the day one gross-up of purchased credit deteriorated ("PCD") assets. The standard was adopted using the prospective transition approach for PCD assets that were previously classified as purchased credit impaired ("PCI") assets. As prescribed by the standard, management did not reassess whether PCI assets met the criteria of PCD assets at the date of adoption. On January 1, 2020, the amortized cost basis of the PCD assets were adjusted to reflect estimated credit losses, with the remaining non-credit related discount, calculated based on the adjusted amortized cost, and will be accreted into interest income on a straight line basis over the remaining contractual term of the asset. See Note 3 Securities and Note 4 Loans, Allowance for Credit Losses and Credit Quality for further details surrounding the Company's adoption of CECL, related accounting policy updates and full disclosures required under the standard. FASB ASC Topic 848 "Reference Rate Reform" Update No. 2020-04. Update No. 2020-04 was issued in March 2020 to provide optional expedients and exceptions for applying generally accepted accounting principles (GAAP) to certain contracts, hedging relationships, and other transactions affected by reference rate reform if certain criteria are met. The amendments in this update apply only to contracts, hedging relationships, and other transactions that reference the London Interbank Offered Rate ("LIBOR") or another reference rate expected to be discontinued because of reference rate reform. The expedients and exceptions provided by the amendments do not apply to contract modifications made and hedging relationships existing as of December 31, 2022, that an entity has elected certain optional expedients for and that are retained through the end of the hedging relationship. The amendments in this update are effective for all entities as of March 12, 2020 through December 31, 2022 and do not apply to contract modifications made after December 31, 2022. The Company has not yet adopted the amendments in this update and is currently in the process of reviewing its contracts and existing processes in order to assess the risks and potential impact of the transition away from LIBOR.

Securities

Securities	3 Months Ended
	Mar. 31, 2020
Investments, Debt and Equity Securities [Abstract]
Marketable Securities [Table Text Block]	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 or trading 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. Accrued interest receivable balances are excluded from the amortized cost of held to maturity securities and the fair value of available for sale securities and are included within Other Assets on the consolidated balance sheet. Management has elected not to measure an allowance for credit losses on these balances as the Company employs a timely write-off policy. It is the Company's policy that a security is placed on nonaccrual status at the time any principal or interest payments become 90 days delinquent, and interest earned but not collected for a security placed on non-accrual is reversed against interest income. Allowance for Credit Losses - Available for Sale Securities The Company's available for sale securities are carried at fair value. For available for sale securities in an unrealized loss position, management will first evaluate whether there is intent to sell, or if it is more likely than not that the Company will be required to sell a security prior to anticipated recovery of its amortized cost basis. If either of these criteria are met, the Company will record a write-down of the security's amortized cost basis to fair value through income. For those available for sale securities which do not meet the intent or requirement to sell criteria, management will evaluate whether the decline in fair value is a result of credit related matters or other factors. In performing this assessment, Management considers the creditworthiness of the issuer including whether the security is guaranteed by the U.S. Federal Government or other government agency, the extent to which fair value is less than amortized cost, and changes in credit rating during the period, among other factors. If this assessment indicates the existence of credit losses, the security will be written down to fair value, as determined by a discounted 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 is recognized in earnings. Changes in the allowance for credit losses are recorded as a provision for (or reversal of) credit loss expense. Losses are charged against the allowance when the uncollectibility of a security is confirmed, or when either of the aforementioned criteria surrounding intent or requirement to sell have been met. Allowance for Credit Losses - Held to Maturity Securities The Company measures expected credit losses on held to maturity securities on a collective basis by major security type. Management classifies the held-to maturity portfolio into the following major security types: U.S. Government Agency, U.S. Treasury, Agency Mortgage-Backed Securities, Agency Collateralized Mortgage Obligations, Small Business Administration Pooled Securities, and Single Issuer Trust Preferred Securities. Securities in the Company's held to maturity portfolio are primarily guaranteed by either the U.S. Federal Government or other government sponsored agencies with a long history of no credit losses. As a result, Management has determined these securities to have a zero loss expectation and therefore does not estimate an allowance for credit losses on these securities. Trading Securities The Company had trading securities of $2.2 million as of March 31, 2020 and December 31, 2019 . These securities are held in a rabbi trust and will be used for future payments associated with the Company’s nonqualified 401(k) Restoration Plan and Nonqualified Deferred Compensation Plan. Equity Securities The Company had equity securities of $19.4 million and $21.3 million as of March 31, 2020 and December 31, 2019 , respectively. 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. The following table represents a summary of the gains and losses that relate to equity securities for the periods indicated: Three Months Ended March 31 2020 2019 Net gains (losses) recognized during the period on equity securities $ (1,801 ) $ 907 Less: net gains recognized during the period on equity securities sold during the period 6 3 Unrealized gains (losses) recognized during the reporting period on equity securities still held at the reporting date $ (1,807 ) $ 904 Available for Sale Securities The following table summarizes the amortized cost, allowance for credit losses, and fair value of available for sale securities and the corresponding amounts of gross unrealized gains and losses recognized in accumulated other comprehensive income(loss) as of the dates indicated: March 31, 2020 December 31, 2019 Amortized Gross Gross Unrealized Allowance for credit losses Fair Amortized Gross Gross Unrealized Fair (Dollars in thousands) U.S. government agency securities $ 22,474 $ 1,818 $ — $ — $ 24,292 $ 32,473 $ 642 $ — $ 33,115 Agency mortgage-backed securities 247,675 11,110 (1 ) — 258,784 243,548 3,456 (4 ) 247,000 Agency collateralized mortgage obligations 83,183 4,027 — — 87,210 87,305 1,225 (19 ) 88,511 State, county, and municipal securities 1,126 18 — — 1,144 1,377 19 — 1,396 Single issuer trust preferred securities issued by banks 489 — (53 ) — 436 488 5 — 493 Pooled trust preferred securities issued by banks and insurers 1,443 — (434 ) — 1,009 1,488 — (374 ) 1,114 Small business administration pooled securities 63,062 1,359 — — 64,421 54,024 771 — 54,795 Total available for sale securities $ 419,452 $ 18,332 $ (488 ) $ — $ 437,296 $ 420,703 $ 6,118 $ (397 ) $ 426,424 As noted in the table above, the Company did not record an allowance for estimated credit losses on any available for sale securities during the three months ended March 31, 2020 . Excluded from the table above is accrued interest on available for sale securities of $1.6 million as of March 31, 2020 , which is included within Other Assets on the consolidated balance sheet. Additionally, the Company did not record any write-offs of accrued interest income on available for sale securities during the three months ended March 31, 2020 . No securities held by the Company were delinquent on contractual payments as of March 31, 2020 , nor were any securities placed on non-accrual status during the three months then ended. When securities are sold, the adjusted cost of the specific security sold is used to compute the gain or loss on the sale. The Company had no sales of securities available for sale during the three months ended March 31, 2020 and 2019 , and therefore no gains or losses were realized during the periods presented. The following table shows the gross unrealized losses and fair value of the Company’s available for sale securities which are in an unrealized loss position, and for which the Company has not recorded an allowance for credit losses as of March 31, 2020 . These available for sale securities are aggregated by major security type and length of time that individual securities have been in a continuous unrealized loss position: March 31, 2020 Less than 12 months 12 months or longer Total # of holdings Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses (Dollars in thousands) Agency mortgage-backed securities 1 86 (1 ) — — 86 (1 ) Single issuer trust preferred securities issued by banks and insurers 1 436 (53 ) — — 436 (53 ) Pooled trust preferred securities issued by banks and insurers 1 — — 1,009 (434 ) 1,009 (434 ) Total temporarily impaired available for sale securities 3 $ 522 $ (54 ) $ 1,009 $ (434 ) $ 1,531 $ (488 ) 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 did not recognize an allowance for credit losses on these investments during the three months ended March 31, 2020 . 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 March 31, 2020 : • Agency Mortgage-Backed 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 one security, which is investment grade. The unrealized loss on this security 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: This portfolio consists of one below investment grade security which is performing. The unrealized loss on this security is attributable to the illiquid nature of the trust preferred market in the current economic and regulatory environment. Management evaluates collateral credit and instrument structure, including current and expected deferral and default rates and timing. In addition, discount rates are determined by evaluating comparable spreads observed currently in the market for similar instruments. Held to Maturity Securities The following table summarizes the amortized cost, fair value and allowance for credit losses of held to maturity securities and the corresponding amounts of gross unrealized gains and losses recognized in accumulated other comprehensive income(loss) as of the dates indicated: March 31, 2020 December 31, 2019 Amortized Gross Gross Unrealized Allowance for credit losses Fair Amortized Gross Gross Unrealized Fair (Dollars in thousands) U.S. government agency securities $ — $ — $ — $ — $ — $ 12,874 $ 123 $ — $ 12,997 U.S. Treasury securities 4,029 110 — — 4,139 4,032 21 — 4,053 Agency mortgage-backed securities 463,632 18,864 (133 ) — 482,363 397,414 8,445 (57 ) 405,802 Agency collateralized mortgage obligations 277,921 11,981 — — 289,902 293,662 4,501 (849 ) 297,314 Single issuer trust preferred securities issued by banks 1,500 — (10 ) — 1,490 1,500 — (10 ) 1,490 Small business administration pooled securities 30,716 745 — — 31,461 31,324 338 (55 ) 31,607 Total held to maturity securities $ 777,798 $ 31,700 $ (143 ) $ — $ 809,355 $ 740,806 $ 13,428 $ (971 ) $ 753,263 As noted in the table above, the Company did not record an allowance for estimated credit losses on any held to maturity securities during the three months ended March 31, 2020 . Excluded from the table above is accrued interest on held to maturity securities of $2.0 million as of March 31, 2020 , which is included within Other Assets on the consolidated balance sheet. Additionally, the Company did not record any write-offs of accrued interest income on held to maturity securities during the three months ended March 31, 2020 . No securities held by the Company were delinquent on contractual payments as of March 31, 2020 , nor were any securities placed on non-accrual status during the three months then ended. When securities are sold, the adjusted cost of the specific security sold is used to compute the gain or loss on the sale. The Company had no sales of held to maturity securities during the three months ended March 31, 2020 and 2019 , and therefore no gains or losses were realized during the periods presented. The Company monitors the credit quality of held to maturity securities through the use of credit ratings. Credit ratings are monitored by the Company on at least a quarterly basis. As of March 31, 2020 , all held to maturity securities held by the Company were rated investment grade or higher. The actual maturities of certain available for sale or held to maturity 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 available for sale and held to maturity securities as of March 31, 2020 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 $ — $ — $ 10,002 $ 10,351 $ 12,472 $ 13,941 $ — $ — $ 22,474 $ 24,292 Agency mortgage-backed securities — — 72,092 75,268 41,885 44,607 133,698 138,909 247,675 258,784 Agency collateralized mortgage obligations — — — — — — 83,183 87,210 83,183 87,210 State, county, and municipal securities 250 250 687 691 189 203 — — 1,126 1,144 Single issuer trust preferred securities issued by banks — — — — — — 489 436 489 436 Pooled trust preferred securities issued by banks and insurers — — — — — — 1,443 1,009 1,443 1,009 Small business administration pooled securities — — — — — — 63,062 64,421 63,062 64,421 Total available for sale securities $ 250 $ 250 $ 82,781 $ 86,310 $ 54,546 $ 58,751 $ 281,875 $ 291,985 $ 419,452 $ 437,296 Held to maturity securities U.S. Treasury securities $ — $ — $ 4,029 $ 4,139 $ — $ — $ — $ — $ 4,029 $ 4,139 Agency mortgage-backed securities 8,619 8,715 1,902 1,951 48,123 50,345 404,988 421,352 463,632 482,363 Agency collateralized mortgage obligations — — — — — — 277,921 289,902 277,921 289,902 Single issuer trust preferred securities issued by banks — — — — 1,500 1,490 — — 1,500 1,490 Small business administration pooled securities — — — — — — 30,716 31,461 30,716 31,461 Total held to maturity securities $ 8,619 $ 8,715 $ 5,931 $ 6,090 $ 49,623 $ 51,835 $ 713,625 $ 742,715 $ 777,798 $ 809,355 Total $ 8,869 $ 8,965 $ 88,712 $ 92,400 $ 104,169 $ 110,586 $ 995,500 $ 1,034,700 $ 1,197,250 $ 1,246,651 Included in the table above are $4.1 million of callable securities at March 31, 2020 . The carrying value of securities pledged to secure public funds, trust deposits, and for other purposes, as required or permitted by law, was $459.5 million and $375.5 million at March 31, 2020 and December 31, 2019 , respectively. At March 31, 2020 and December 31, 2019 , the Company had no investments in obligations of individual states, counties, or municipalities which exceeded 10% of stockholders’ equity . Under previous accounting guidance, the Company reviewed both available for sale and held to maturity securities for other-than-temporary-impairment ("OTTI"). However, in accordance with the newly adopted CECL standard, the Company now utilizes separate impairment models for held to maturity and available for sale securities for purposes of estimating credit losses. The following table shows the gross unrealized losses and fair value of the Company’s investments in an unrealized loss position, which the Company had not deemed to be OTTI, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position as of December 31, 2019: December 31, 2019 Less than 12 months 12 months or longer Total # of holdings Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses (Dollars in thousands) Agency mortgage-backed securities 12 34,009 (59 ) 243 (2 ) 34,252 (61 ) Agency collateralized mortgage obligations 17 48,476 (215 ) 37,382 (653 ) 85,858 (868 ) Single issuer trust preferred securities issued by banks and insurers 1 — — 1,490 (10 ) 1,490 (10 ) Pooled trust preferred securities issued by banks and insurers 1 — — 1,114 (374 ) 1,114 (374 ) Small business administration pooled securities 1 7,349 (55 ) — — 7,349 (55 ) Total temporarily impaired securities 32 $ 89,834 $ (329 ) $ 40,229 $ (1,039 ) $ 130,063 $ (1,368 )

Loans, Allowance for Credit Los

Loans, Allowance for Credit Losses and Credit Quality (Notes)	3 Months Ended
	Mar. 31, 2020
Receivables [Abstract]
Loans, Allowance for Credit Losses and Credit Quality [Text Block]	90 Days and Accruing Number of Loans Principal Balance Number of Loans Principal Balance Number of Loans Principal Balance Number of Loans Principal Balance Current (Dollars in thousands) Loan Portfolio Commercial and industrial 13 $ 1,930 — $ — 6 $ 1,078 19 $ 3,008 $ 1,445,216 $ 1,448,224 $ — Commercial real estate 18 6,989 2 383 7 1,499 27 8,871 4,052,476 4,061,347 — Commercial construction 1 331 — — — — 1 331 526,807 527,138 — Small business 12 1,030 8 185 5 176 25 1,391 176,429 177,820 — Residential real estate 19 2,614 5 994 39 6,258 63 9,866 1,518,550 1,528,416 — Home equity 22 1,507 7 801 36 3,030 65 5,338 1,140,932 1,146,270 — Other consumer (1) 335 386 11 67 16 99 362 552 26,663 27,215 25 Total 420 $ 14,787 33 $ 2,430 109 $ 12,140 562 $ 29,357 $ 8,887,073 $ 8,916,430 $ 25 December 31, 2019 30-59 days 60-89 days 90 days or more Total Past Due Total Financing Receivables Recorded Investment >90 Days and Accruing Number of Loans Principal Balance Number of Loans Principal Balance Number of Loans Principal Balance Number of Loans Principal Balance Current (Dollars in thousands) Loan Portfolio Commercial and industrial 1 $ 253 2 $ 323 5 $ 760 8 $ 1,336 $ 1,393,700 $ 1,395,036 $ — Commercial real estate 7 1,690 1 194 8 2,038 16 3,922 3,998,437 4,002,359 218 (2 ) Commercial construction 1 560 — — — — 1 560 546,733 547,293 — Small business 11 837 3 15 6 115 20 967 173,530 174,497 — Residential real estate 17 2,237 17 3,055 38 7,020 72 12,312 1,578,257 1,590,569 1,652 (2 ) Home equity 23 1,689 8 524 40 3,854 71 6,067 1,127,731 1,133,798 265 (2 ) Other consumer (1) 387 245 12 44 16 32 415 321 29,766 30,087 22 Total 447 $ 7,511 43 $ 4,155 113 $ 13,819 603 $ 25,485 $ 8,848,154 $ 8,873,639 $ 2,157 (1) Other consumer portfolio is inclusive of deposit account overdrafts recorded as loan balances. (2) Represents purchased credit impaired loans that were accruing interest due to expectations of future cash collections. 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: March 31, 2020 December 31, 2019 (Dollars in thousands) TDRs on accrual status $ 18,129 $ 19,599 TDRs on nonaccrual 23,842 24,766 Total TDRs $ 41,971 $ 44,365 Amount of specific reserves included in the allowance for lo" id="sjs-B4">LOANS, ALLOWANCE FOR CREDIT LOSSES AND CREDIT QUALITY 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 that the Company has the intent and ability to hold until maturity or payoff are carried at amortized cost (net of the allowance for credit losses). Amortized cost is the principal amount outstanding, 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. 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 in a timely manner 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 credit losses. When doubt exists as to the collectability of a loan, any payments received are applied to reduce the amortized cost of the loan 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. Allowance for Credit Losses - Loans Held for Investment The allowance for credit losses is established based upon the Company's current estimate of expected lifetime credit losses on loans measured at amortized cost. Loan losses are charged against the allowance when Management's assessments confirm that the Company will not collect the full amortized cost basis of a loan. Subsequent recoveries, if any, are credited to the allowance. Under the CECL methodology, the Company estimates credit losses for financial assets on a collective basis for loans sharing similar risk characteristics using a quantitative model combined with an assessment of certain qualitative factors designed to address forecast risk and model risk inherent in the quantitative model output. The quantitative model utilizes a factor based approach to estimate expected credit losses using Probability of Default ("PD"), Loss Given Default ("LGD") and Exposure at Default ("EAD"), which are derived from internal historical default and loss experience. The model estimates expected credit losses using loan level data over the estimated life of the exposure, considering the effect of prepayments. Economic forecasts are incorporated into the estimate over a reasonable and supportable forecast period, beyond which is a reversion to the Company's historical long-run average. Management has determined a reasonable and supportable period of 12 months, and a straight line reversion period of 6 months, to be appropriate for purposes of estimating expected credit losses. The qualitative risk factors impacting the expected risk of loss within the portfolio include the following: • Lending policies and procedures • Economic and business conditions • Nature and volume of loans • Changes in management • Changes in credit quality • Changes in loan review system • Changes to underlying collateral values • Concentrations of credit risk • Other external factors Loans that do not share similar risk characteristics with any pools of assets are subject to individual assessment and are removed from the collectively assessed pools to avoid double counting. For the loans that will be individually assessed, the Company will use either a discounted cash flow (“DCF”) approach or a fair value of collateral approach. The latter approach will be used for loans deemed to be collateral dependent or when foreclosure is probable. Accrued interest receivable amounts are excluded from balances of loans held at amortized cost and are included within other assets on the consolidated balance sheet. Management has elected not to measure an allowance for credit losses on these amounts as the Company employs a timely write-off policy. Consistent with the Company's policy for nonaccrual loans, accrued interest receivable is typically written off when loans reach 90 days past due and are placed on nonaccrual status. In the ordinary course of business, the Company 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 credit losses. The reserve for unfunded lending commitments is included in other liabilities on the consolidated balance sheet. Acquired Loans Prior to its adoption of CECL, and under legacy GAAP, the Company maintained a portfolio of acquired loans, which, at acquisition, were recorded at fair value with no carryover of the allowance for loan losses. Acquired loans were also reviewed to determine if the loan had evidence of deterioration in credit quality and also if it was probable, at acquisition, that all contractually required payments would not be collected. Loans meeting such criteria were 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", was accreted into interest income over the life of the loans using the effective yield method. Accordingly, PCI loans were not subject to classification as nonaccrual in the same manner as originated loans. Rather, acquired PCI loans were generally considered to be accruing loans because their interest income related 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", included estimates of both the impact of prepayments and future credit losses expected to be incurred over the life of the loans. Under the CECL standard, the concept of PCI assets was effectively replaced with purchased credit deteriorated ("PCD") assets, the balances of which should be treated in a manner consistent with loans held for investment for purposes of estimating an allowance for credit losses. As a result, upon the Company's adoption of CECL on January 1, 2020, loan balances previously classified as PCI assets were re-classified as PCD assets and will be prospectively accounted for in accordance with the standard. See Note 2 - Recent Accounting Standards Updates for further discussion surrounding the day one impact associated with adoption of CECL as it relates to PCI assets. Loans Held for Investment and Allowance for Credit Losses The following table summarizes the change in allowance for credit losses by loan category, and bifurcates the amount of loans allocated to each loan category for the period indicated: Three Months Ended March 31, 2020 (Dollars in thousands) Commercial and Commercial Commercial Small Residential Other Consumer Total Allowance for credit losses Beginning balance, pre adoption of Topic 326 $ 17,594 $ 32,935 $ 6,053 $ 1,746 $ 3,440 $ 5,576 $ 396 $ 67,740 Cumulative effect accounting adjustment (1) (1,984 ) (13,048 ) (3,652 ) 495 9,828 7,012 212 (1,137 ) Cumulative effect accounting adjustment (2) 49 337 — — 423 319 29 1,157 Charge-offs — — — 109 — 138 487 734 Recoveries 42 — — 3 1 58 246 350 Provision for credit loss expense 5,948 9,274 1,346 1,694 1,155 5,083 500 25,000 Ending balance (3) $ 21,649 $ 29,498 $ 3,747 $ 3,829 $ 14,847 $ 17,910 $ 896 $ 92,376 (1) Represents adjustment needed to reflect the cumulative day one impact pursuant to the Company's adoption of Accounting Standards Update 2016-13. The adjustment represents a $1.1 million decrease to the allowance attributable to the change in accounting methodology for estimating the allowance for credit losses resulting from the Company's adoption of the standard. (2) Represents adjustment needed to reflect the day one re-class of the Company's PCI loan balances to PCD and the associated gross-up, pursuant to the Company's adoption of Accounting Standards Update 2016-13. The adjustment represents a $1.2 million increase to the allowance resulting from the day one re-class. (3) Balances of accrued interest receivable excluded from amortized cost and the calculation of allowance for credit losses amounted to $25.9 million as of March 31, 2020. The balance of allowance for credit losses of $92.4 million as of March, 31, 2020, represents an increase of $24.6 million , or 36.3% , in comparison to the implementation balances at January 1, 2020. This increase in the allowance during the first quarter was primarily driven by forecasted credit deterioration due to the ongoing COVID-19 pandemic. The model applies a reasonable and supportable forecast period of one year, with a reversion period of six months. This forecast was adjusted to use a more severe outlook at March 31, 2020 as compared to the baseline forecast that was used to calculate opening balances on January 1, 2020. In addition, social distancing restrictions have led to a decline in consumer spending and a steep rise in unemployment, especially within certain industries. While management is unable to know with certainty the direct, indirect, and future impacts of the COVID-19 pandemic, it is expected it will have a material adverse impact on many of the Company's loan customers. As such, the provision amounts were also qualitatively adjusted to factor in the anticipated impact of the COVID-19 pandemic. Management reviewed relationships which may be deemed "at risk" within industries expected to be impacted such as Education & Other Services, Hospital & Health Care, Hospitality & Food Service, Motor Vehicles & Parts Dealers, Recreation & Entertainment, Retail- Good (excluding food) and Transportation sectors. The provision was qualitatively adjusted upward to ensure coverage for these "at risk" relationships as a result of this review. For the purpose of estimating the allowance for credit losses, management segregated 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 land development, 1-4 family, condominium, and multi-family home construction, 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 policy to obtain personal guarantees for payment from individuals holding material ownership interests in 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. The majority of home equity lines of credit have a variable rate and are 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 and amortizing loans made to qualified individuals for various purposes such as education, 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, 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. 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 for the commercial portfolio are defined as follows: • 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. • 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. • Definite Weakness Loss Unlikely: Borrowers exhibit well defined weaknesses that jeopardize the orderly liquidation of debt. Loans 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. • 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. • 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. For the Company’s consumer portfolio, the quality of the loan is best indicated by the repayment performance of an individual borrower. As a result, for this portfolio the Company utilizes a pass/default risk-rating system, based on an age analysis (i.e., days past due) associated with each consumer loan. Under this structure, consumer loans less than 90 days past due are assigned a "pass" rating, while any consumer loans greater than 90 days past due are assigned a "default" rating. The following table details the amortized cost balances of the Company's loan portfolios, presented by credit quality indicator and origination year as of March 31, 2020: March 31, 2020 2020 2019 2018 2017 2016 Prior Revolving Loans Revolving converted to Term Total (Dollars in thousands) Commercial and Pass $ 119,886 $ 213,925 $ 138,376 $ 50,323 $ 36,685 $ 33,576 $ 736,304 $ 327 $ 1,329,402 Potential weakness 362 5,432 1,489 4,909 725 697 21,780 50 35,444 Definite weakness - loss unlikely 495 2,128 26,006 5,589 2,604 1,575 44,932 — 83,329 Partial loss probable — — — — — 49 — — 49 Definite loss — — — — — — — — — Total commercial and industrial $ 120,743 $ 221,485 $ 165,871 $ 60,821 $ 40,014 $ 35,897 $ 803,016 $ 377 $ 1,448,224 Commercial real estate Pass $ 260,217 $ 943,205 $ 586,125 $ 651,335 $ 468,824 $ 945,248 $ 48,056 $ 2,987 $ 3,905,997 Potential weakness 1,809 8,303 33,755 8,506 9,851 42,382 — — 104,606 Definite weakness - loss unlikely — 3,612 7,432 20,395 6,993 12,312 — — 50,744 Partial loss probable — — — — — — — — — Definite loss — — — — — — — — — Total commercial real estate $ 262,026 $ 955,120 $ 627,312 $ 680,236 $ 485,668 $ 999,942 $ 48,056 $ 2,987 $ 4,061,347 Commercial construction Pass $ 43,369 $ 221,773 $ 114,561 $ 73,493 $ — $ 6,867 $ 44,225 $ 325 $ 504,613 Potential weakness — 554 347 19,044 — — 347 — 20,292 Definite weakness - loss unlikely — — 1,887 — — — 346 — 2,233 Partial loss probable — — — — — — — — — Definite loss — — — — — — — — — Total commercial construction $ 43,369 $ 222,327 $ 116,795 $ 92,537 $ — $ 6,867 $ 44,918 $ 325 $ 527,138 Small business Pass $ 8,414 $ 31,651 $ 25,184 $ 17,848 $ 17,594 $ 26,734 $ 47,109 $ — $ 174,534 Potential weakness — 12 18 13 753 259 597 — 1,652 Definite weakness - loss unlikely — 47 133 51 169 598 636 — 1,634 Partial loss probable — — — — — — — — — Definite loss — — — — — — — — — Total small business $ 8,414 $ 31,710 $ 25,335 $ 17,912 $ 18,516 $ 27,591 $ 48,342 $ — $ 177,820 Residential real estate Pass $ 39,122 $ 204,524 $ 260,899 $ 210,662 $ 283,255 $ 523,742 $ — $ — $ 1,522,204 Default — — 427 435 — 5,350 — — 6,212 Total residential real estate $ 39,122 $ 204,524 $ 261,326 $ 211,097 $ 283,255 $ 529,092 $ — $ — $ 1,528,416 Home equity Pass $ 23,397 $ 75,161 $ 70,081 $ 67,740 $ 51,106 $ 138,733 $ 715,169 $ 1,853 $ 1,143,240 Default — — — 18 — 579 2,372 61 3,030 Total home equity $ 23,397 $ 75,161 $ 70,081 $ 67,758 $ 51,106 $ 139,312 $ 717,541 $ 1,914 $ 1,146,270 Other consumer Pass $ 414 $ 705 $ 356 $ 1,049 $ 1,000 $ 10,850 $ 12,767 $ — $ 27,141 Default — — — 19 — 39 16 — 74 Total other consumer $ 414 $ 705 $ 356 $ 1,068 $ 1,000 $ 10,889 $ 12,783 $ — $ 27,215 Total $ 497,485 $ 1,711,032 $ 1,267,076 $ 1,131,429 $ 879,559 $ 1,749,590 $ 1,674,656 $ 5,603 $ 8,916,430 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: March 31 December 31 Residential portfolio FICO score (re-scored)(1) 749 749 LTV (re-valued)(2) 58.1 % 59.0 % Home equity portfolio FICO score (re-scored)(1) 768 767 LTV (re-valued)(2)(3) 46.9 % 46.6 % (1) The average FICO scores at March 31, 2020 are based upon rescores available from February 2020 and origination score data for loans booked in March 2020. The average FICO scores at December 31, 2019 were based upon rescores available from November 2019 and origination score data for loans booked in December 2019. (2) The combined LTV ratios for March 31, 2020 are based upon updated automated valuations as of March 2020, when available, and/or the most current valuation data available. The combined LTV ratios for December 31, 2019 were based upon updated automated valuations as of November 2019, 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. Unfunded Commitments Management evaluates the need for a reserve on unfunded lending commitments in a manner consistent with loans held for investment. As of January 1, 2020, the Company's reserve for unfunded commitments was $1.1 million , as adjusted for adoption of CECL. At March 31, 2020, the Company's estimated reserve for unfunded commitments amounted to $650,000 . Asset Quality The Company’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 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 other loans over 90 days delinquent if the loan is well secured and/or in process of collection. The following table shows information regarding nonaccrual loans as of the dates indicated: Nonaccrual Balances March 31, 2020 December 31, 2019 With Allowance for Credit Losses Without Allowance for Credit Losses Total Total (Dollars in thousands) Commercial and industrial $ 1,078 $ 20,357 $ 21,435 $ 22,574 Commercial real estate 1,305 3,644 4,949 3,016 Commercial construction — — — — Small business 450 — 450 311 Residential real estate 11,001 3,501 14,502 13,360 Home equity 6,463 108 6,571 6,570 Other consumer 108 — 108 61 Total nonaccrual loans $ 20,405 $ 27,610 $ 48,015 (1) $ 45,892 (1) (1) Included in these amounts were $23.8 million and $24.8 million of nonaccruing TDRs at March 31, 2020 and December 31, 2019 , respectively. It is the Company's policy to reverse any accrued interest when a loan is put on nonaccrual status, as such the Company did not record any interest income on nonaccrual loans during the three months ended March 31, 2020. The following table shows information regarding foreclosed residential real estate property at the dates indicated: March 31, 2020 December 31, 2019 (Dollars in thousands) Foreclosed residential real estate property held by the creditor $ — $ — Recorded investment in mortgage loans collateralized by residential real estate property that are in the process of foreclosure $ 4,580 $ 3,294 The following tables show the age analysis of past due financing receivables as of the dates indicated: March 31, 2020 30-59 days 60-89 days 90 days or more Total Past Due Total Financing Receivables Amortized Cost >90 Days and Accruing Number of Loans Principal Balance Number of Loans Principal Balance Number of Loans Principal Balance Number of Loans Principal Balance Current (Dollars in thousands) Loan Portfolio Commercial and industrial 13 $ 1,930 — $ — 6 $ 1,078 19 $ 3,008 $ 1,445,216 $ 1,448,224 $ — Commercial real estate 18 6,989 2 383 7 1,499 27 8,871 4,052,476 4,061,347 — Commercial construction 1 331 — — — — 1 331 526,807 527,138 — Small business 12 1,030 8 185 5 176 25 1,391 176,429 177,820 — Residential real estate 19 2,614 5 994 39 6,258 63 9,866 1,518,550 1,528,416 — Home equity 22 1,507 7 801 36 3,030 65 5,338 1,140,932 1,146,270 — Other consumer (1) 335 386 11 67 16 99 362 552 26,663 27,215 25 Total 420 $ 14,787 33 $ 2,430 109 $ 12,140 562 $ 29,357 $ 8,887,073 $ 8,916,430 $ 25 December 31, 2019 30-59 days 60-89 days 90 days or more Total Past Due Total Financing Receivables Recorded Investment >90 Days and Accruing Number of Loans Principal Balance Number of Loans Principal Balance Number of Loans Principal Balance Number of Loans Principal Balance Current (Dollars in thousands) Loan Portfolio Commercial and industrial 1 $ 253 2 $ 323 5 $ 760 8 $ 1,336 $ 1,393,700 $ 1,395,036 $ — Commercial real estate 7 1,690 1 194 8 2,038 16 3,922 3,998,437 4,002,359 218 (2 ) Commercial construction 1 560 — — — — 1 560 546,733 547,293 — Small business 11 837 3 15 6 115 20 967 173,530 174,497 — Residential real estate 17 2,237 17 3,055 38 7,020 72 12,312 1,578,257 1,590,569 1,652 (2 ) Home equity 23 1,689 8 524 40 3,854 71 6,067 1,127,731 1,133,798 265 (2 ) Other consumer (1) 387 245 12 44 16 32 415 321 29,766 30,087 22 Total 447 $ 7,511 43 $ 4,155 113 $ 13,819 603 $ 25,485 $ 8,848,154 $ 8,873,639 $ 2,157 (1) Other consumer portfolio is inclusive of deposit account overdrafts recorded as loan balances. (2) Represents purchased credit impaired loans that were accruing interest due to expectations of future cash collections. 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: March 31, 2020 December 31, 2019 (Dollars in thousands) TDRs on accrual status $ 18,129 $ 19,599 TDRs on nonaccrual 23,842 24,766 Total TDRs $ 41,971 $ 44,365 Amount of specific reserves included in the allowance for lo

Loans, Allowance for Loan Losse

Loans, Allowance for Loan Losses and Credit Quality	3 Months Ended
	Mar. 31, 2020
Loans, Allowance for Loan Losses and Credit Quality [Abstract]
LOANS, ALLOWANCE FOR LOAN LOSSES AND CREDIT QUALITY	LOANS AND ALLOWANCE FOR LOAN LOSSES As disclosed in Note 4 - Loans, Allowance for Credit Losses and Credit Quality , the Company adopted the CECL standard, effective January 1, 2020. As required by disclosure guidance, the Company has included relevant disclosures from the prior year and prior to the adoption of CECL within this footnote, as it relates to loans and allowance for loan losses. The following table bifurcates the amount of loans and the allowance allocated to each loan category based on the type of impairment analysis as of December 31, 2019: December 31, 2019 Commercial Commercial Commercial Small Residential Home Other Consumer Total (Dollars in thousands) Financing receivables ending balance: Collectively evaluated for impairment $ 1,370,580 $ 3,987,848 $ 547,293 $ 173,960 $ 1,571,848 $ 1,127,963 $ 29,663 $ 8,809,155 Individually evaluated for impairment 24,456 8,337 — 537 11,228 4,948 122 49,628 Purchased credit impaired loans — 6,174 — — 7,493 887 302 14,856 Total loans by group $ 1,395,036 $ 4,002,359 $ 547,293 $ 174,497 $ 1,590,569 $ 1,133,798 $ 30,087 $ 8,873,639 (1) (1) The amount of net deferred costs on originated loans included in the ending balance was $7.1 million at December 31, 2019 . Net unamortized discounts on acquired loans not deemed to be purchased credit impaired ("PCI") included in the ending balance was $21.6 million at December 31, 2019 . At December 31, 2019 , the reserve for unfunded loan commitments was $2.1 million . The following table summarizes changes in allowance for loan losses by loan category for the period indicated: Three Months Ended March 31, 2019 (Dollars in thousands) Commercial and Industrial Commercial Real Estate Commercial Construction Small Business Residential Real Estate Home Equity Other Consumer Total Allowance for loan losses Beginning balance $ 15,760 $ 32,370 $ 5,158 $ 1,756 $ 3,219 $ 5,608 $ 422 $ 64,293 Charge-offs — — — (145 ) — (113 ) (301 ) (559 ) Recoveries 124 33 — 27 1 66 155 406 Provision (benefit) 988 (354 ) 197 146 14 (54 ) 63 1,000 Ending balance $ 16,872 $ 32,049 $ 5,355 $ 1,784 $ 3,234 $ 5,507 $ 339 $ 65,140 Ending balance: collectively evaluated for impairment $ 16,814 $ 31,974 $ 5,355 $ 1,783 $ 2,432 $ 5,346 $ 332 $ 64,036 Ending balance: individually evaluated for impairment $ 58 $ 75 $ — $ 1 $ 802 $ 161 $ 7 $ 1,104 The Company's historical approach to loan portfolio segmentation by risk characteristics and monitoring of credit quality for commercial loans under previous accounting guidance was consistent with that applied under the newly adopted CECL standard. See Note 4 - Loans, Allowance for Credit Losses and Credit Quality further discussion surrounding the Company's policies for loan segmentation and credit quality monitoring. The following tables detail the amount of outstanding principal balances relative to each of the risk-rating categories for the Company’s loan portfolio as of December 31, 2019: December 31, 2019 Category Risk Rating Commercial and Industrial Commercial Real Estate Commercial Construction Small Business Total (Dollars in thousands) Pass 1 - 6 $ 1,274,155 $ 3,860,555 $ 542,608 $ 171,213 $ 5,848,531 Potential weakness 7 63,485 97,268 2,247 1,416 164,416 Definite weakness-loss unlikely 8 57,396 44,536 2,438 1,868 106,238 Partial loss probable 9 — — — — — Definite loss 10 — — — — — Total $ 1,395,036 $ 4,002,359 $ 547,293 $ 174,497 $ 6,119,185 Impaired Loans Under previous accounting guidance, a loan was considered impaired when, based on current information and events, it was probable that the Company would 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 included payment status, collateral value, and the probability of collecting scheduled principal and interest payments when due. Loans that experienced insignificant payment delays and payment shortfalls generally were not classified as impaired. Management determined 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 table below sets forth information regarding the Company’s impaired loans by loan portfolio at the date indicated: December 31, 2019 Recorded Investment Unpaid Principal Balance Related Allowance (Dollars in thousands) With no related allowance recorded Commercial and industrial $ 23,786 $ 34,970 $ — Commercial real estate 6,213 12,101 — Small business 469 484 — Residential real estate 4,976 5,123 — Home equity 3,764 3,893 — Other consumer 34 34 — Subtotal 39,242 56,605 — With an allowance recorded Commercial and industrial $ 670 $ 670 $ 126 Commercial real estate 2,124 2,124 48 Small business 68 105 8 Residential real estate 6,252 7,163 637 Home equity 1,184 1,382 156 Other consumer 88 91 5 Subtotal 10,386 11,535 980 Total $ 49,628 $ 68,140 $ 980 The following table sets forth information regarding interest income recognized on impaired loans, by portfolio, for the period indicated: Three Months Ended March 31, 2019 Average Recorded Investment Interest Income Recognized (Dollars in thousands) With no related allowance recorded Commercial and industrial $ 30,198 $ 35 Commercial real estate 8,873 104 Commercial construction 311 — Small business 323 2 Residential real estate 4,421 54 Home equity 4,952 55 Other consumer 53 1 Subtotal 49,131 251 With an allowance recorded Commercial and industrial $ 498 $ 3 Commercial real estate 1,682 24 Small business 181 2 Residential real estate 7,665 64 Home equity 985 12 Other consumer 138 1 Subtotal 11,149 106 Total $ 60,280 $ 357 Purchased Credit Impaired Loans Under previous accounting guidance, certain loans acquired by the Company which may have shown evidence of deterioration of credit quality since origination at purchase date and was therefore 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 date indicated: December 31, 2019 (Dollars in thousands) Outstanding balance $ 18,358 Carrying amount $ 14,856 The following table summarizes activity in the accretable yield for the PCI loan portfolio for the period indicated: Three Months Ended March 31 2019 (Dollars in thousands) Beginning balance $ 1,191 Accretion (141 ) Other change in expected cash flows (1) 114 Reclassification from nonaccretable difference for loans which have paid off — Ending balance $ 1,164 (1) Represents changes in cash flows expected to be collected and resulting in increased interest income as a prospective yield adjustment over the remaining life of the loan(s).

Goodwill (Notes)

Goodwill (Notes)	3 Months Ended
	Mar. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets Disclosure [Text Block]	GOODWILL AND OTHER INTANGIBLE ASSETS The following table sets forth the carrying value of goodwill and other intangible assets, net of accumulated amortization, at the periods indicated below: March 31, 2020 December 31, 2019 (Dollars in thousands) Balances not subject to amortization Goodwill $ 506,206 $ 506,206 Balances subject to amortization Core deposit intangibles 26,485 28,016 Other intangible assets 981 1,270 Total other intangible assets 27,466 29,286 Total goodwill and other intangible assets $ 533,672 $ 535,492

Earnings Per Share

Earnings Per Share	3 Months Ended
	Mar. 31, 2020
Earnings Per Share [Abstract]
EARNINGS PER SHARE	EARNINGS PER SHARE Earnings per share consisted of the following components for the periods indicated: Three Months Ended March 31 2020 2019 (Dollars in thousands, except per share data) Net income $ 26,751 $ 35,225 Weighted Average Shares Basic shares 34,184,431 28,106,184 Effect of dilutive securities 36,827 54,466 Diluted shares 34,221,258 28,160,650 Net income per share Basic EPS $ 0.78 $ 1.25 Effect of dilutive securities — — Diluted EPS $ 0.78 $ 1.25 During the three months ended March 31, 2020 and 2019 there were no options to purchase common stock and 5,431 and 6,890 shares of performance-based restricted stock, respectively, that were excluded from the calculation of diluted earnings per share because they were anti-dilutive.

Stock Based Compensation

Stock Based Compensation	3 Months Ended
	Mar. 31, 2020
Share-based Payment Arrangement [Abstract]
STOCK BASED COMPENSATION	STOCK BASED COMPENSATION Time Vested Restricted Stock Awards During the three months ended March 31, 2020 , the Company made the following awards of time vested restricted stock: Date Shares Granted Plan Grant Date Fair Value Per Share Vesting Period 2/27/2020 46,550 2005 Employee Stock Plan $ 70.24 Ratably over 5 years from grant date The fair value of the restricted stock awards is based upon the average of the high and low price at which the Company’s common stock traded on the date of grant. The holders of restricted stock awards are entitled to receive dividends and to vote from and as of the date of grant. Performance-Based Restricted Stock Awards On February 27, 2020 , the Company granted 17,100 performance-based restricted stock awards to certain executive level employees. These performance-based restricted stock awards were issued from the 2005 Employee Stock Plan and were determined to have a grant date fair value per share of $70.24 , determined by the average of the high and low price at which the Company's common stock traded on the date of grant. The number of shares to be vested is contingent upon the Company's attainment of certain performance measures outlined in the award agreement and will be measured as of the end of the three year performance period, January 1, 2020 through December 31, 2022 . The awards will vest upon the earlier of the date on which it is determined if the performance goal is achieved subsequent to the performance period or March 31, 2023 . These awards are accounted for as equity awards due to the nature of these awards and the fact that these shares will not be settled in cash. The holders of these awards are not entitled to receive dividends or vote until the shares are vested. On March 3, 2020 , the performance-based restricted stock awards that were awarded on February 16, 2017 vested at 100% of the maximum target shares awarded, or 14,400 shares. Stock Options The Company did not grant any awards of options to purchase shares of common stock during the three months ended March 31, 2020 .

Derivatives and Hedging Activit

Derivatives and Hedging Activities	3 Months Ended
	Mar. 31, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
DERIVATIVES AND HEDGING ACTIVITIES	DERIVATIVE AND HEDGING ACTIVITIES 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. The Company is subject to over-the-counter derivative clearing requirements which require certain derivatives to be cleared through central clearing houses. Accordingly, the Company clears certain derivative transactions through the Chicago Mercantile Exchange Clearing House ("CME"). This clearing house requires the Company to post initial and variation margin to mitigate the risk of non-payment, the latter of which is received or paid daily based on the net asset or liability position of the contracts. Interest Rate Positions The Company may utilize various interest rate derivatives as hedging instruments against interest rate risk associated with the Company’s borrowings and loan portfolios. An interest rate 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 tables reflect the Company's derivative positions for the periods indicated below for interest rate derivatives which qualify as cash flow hedges for accounting purposes: March 31, 2020 Weighted Average Rate Notional Amount Average Maturity Current Pay Fixed Fair Value (1) (in thousands) (in years) (in thousands) Interest rate swaps on borrowings $ 175,000 2.20 1.28 % 0.94 % $ (1,790 ) Current Rate Paid Receive Fixed Swap Rate Interest rate swaps on loans 450,000 3.41 0.86 % 2.37 % 31,701 Current Rate Paid Receive Fixed Swap Rate Cap - Floor Interest rate collars on loans 400,000 3.41 0.81 % 2.73% - 2.20% 25,573 Total $ 1,025,000 $ 55,484 December 31, 2019 Weighted Average Rate Notional Amount Average Maturity Current Pay Fixed Fair Value (1) (in thousands) (in years) (in thousands) Interest rate swaps on borrowings $ 75,000 2.18 1.90 % 1.53 % $ 140 Current Rate Paid Receive Fixed Swap Rate Interest rate swaps on loans 450,000 3.66 1.76 % 2.37 % 12,907 Current Rate Paid Receive Fixed Swap Rate Cap - Floor Interest rate collars on loans 400,000 3.66 1.76 % 2.73% - 2.20% 9,896 Total $ 925,000 $ 22,943 (1) Beginning in 2020, the Company made an election to include accrued interest within fair value balances. 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 4.6 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 $16.8 million (pre-tax) to be reclassified to interest income and $587,000 (pre-tax) to be reclassified 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 March 31, 2020 . The Company had no fair value hedges as of March 31, 2020 or December 31, 2019 . 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. Derivatives with dealer counterparties are then either cleared through a clearinghouse or settled directly with a single counterparty. 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 as of the dates indicated below for those derivatives not designated as hedging: Notional Amount Maturing Number of Positions (1) Less than 1 year Less than 2 years Less than 3 years Less than 4 years Thereafter Total Fair Value (2) March 31, 2020 (Dollars in thousands) Loan level swaps Receive fixed, pay variable 313 $ 155,318 $ 76,735 $ 126,910 $ 139,600 $ 1,178,142 $ 1,676,705 $ 143,707 Pay fixed, receive variable 305 $ 158,692 $ 76,735 $ 126,910 $ 139,600 $ 1,178,142 $ 1,680,079 $ (143,726 ) Foreign exchange contracts Buys foreign currency, sells U.S. currency 47 $ 118,711 $ — $ — $ — $ — $ 118,711 $ (1,439 ) Buys U.S. currency, sells foreign currency 47 $ 118,711 $ — $ — $ — $ — $ 118,711 $ 1,499 Notional Amount Maturing Number of Positions (1) Less than 1 year Less than 2 years Less than 3 years Less than 4 years Thereafter Total Fair Value (2) December 31, 2019 (Dollars in thousands) Loan level swaps Receive fixed, pay variable 299 $ 156,690 $ 125,203 $ 85,603 $ 165,599 $ 1,044,315 $ 1,577,410 $ 48,596 Pay fixed, receive variable 290 $ 156,690 $ 125,203 $ 85,603 $ 165,599 $ 1,044,315 $ 1,577,410 $ (48,591 ) Foreign exchange contracts Buys foreign currency, sells U.S. currency 40 $ 91,434 $ — $ — $ — $ — $ 91,434 $ (81 ) Buys U.S. currency, sells foreign currency 40 $ 91,434 $ — $ — $ — $ — $ 91,434 $ 123 (1) The Company may enter into one dealer swap agreement which offsets multiple commercial borrower swap agreements. (2) Beginning in 2020, the Company made an election to include accrued interest within fair value balances. Mortgage Derivatives The Company enters into commitments to fund residential mortgage loans at specified rates and times in the future, with the intention that loans will likely be sold subsequently in the secondary market. Mortgage loan commitments are referred to as derivative loan commitments if the loan that will result from exercise of the commitment will be held for sale upon funding. These commitments are recognized at fair value on the consolidated balance sheet in other assets and other liabilities with changes in their fair values recorded within 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 fair value of loans held for sale decreased by $914,000 and increased by $1,000 for the three month periods ended March 31, 2020 and 2019 , respectively. These amounts were offset in earnings by the change in the fair value of mortgage derivatives. Outstanding loan commitments expose the Company to the risk that the price of the loans arising from exercise of the loan commitment might change from inception of the rate lock to funding of the loan due to changes in mortgage interest rates. If interest rates increase, the value of these loan commitments decreases. Conversely, if interest rates decrease, the value of these loan commitments increases. To protect against the price risk inherent in derivative loan commitments, the Company utilizes both "mandatory delivery" and "best efforts" forward loan sale commitments to mitigate the risk of potential decreases in the values of loans that would result from the exercise of the derivative loan commitments. Mandatory delivery contracts are accounted for as derivative instruments. Included in the mandatory delivery forward commitments are To Be Announced securities ("TBAs"). Certain assumptions, including pull through rates and rate lock periods, are used in managing the existing and future hedges. The accuracy of underlying assumptions will impact the ultimate effectiveness of any hedging strategies. With mandatory delivery contracts, the Company commits to deliver a certain principal amount of mortgage loans to an investor at a specified price on or before a specified date. If the Company fails to deliver the amount of mortgages necessary to fulfill the commitment by the specified date, it is obligated to pay a "pair-off" fee, based on then-current market prices, to the investor/counterparty to compensate the investor for the shortfall. Generally the Company makes this type of commitment once mortgage loans have been funded and are held for sale, in order to minimize the risk of failure to deliver the requisite volume of loans to the investor and paying pair-off fees as a result. The Company also sells TBA securities to offset potential changes in the fair value of derivative loan commitments. Generally the Company sells TBA securities by entering into derivative loan commitments for settlement in 30 to 90 days. The Company expects that mandatory delivery contracts, including TBA securities, will experience changes in fair value opposite to the changes in the fair value of derivative loan commitments. With best effort contracts, the Company commits to deliver an individual mortgage loan of a specified principal amount and quality to an investor if the loan to the underlying borrower closes. Generally best efforts cash contracts have no pair off risk regardless of market movement. The price the investor will pay the seller for an individual loan is specified prior to the loan being funded (e.g., on the same day the lender commits to lend funds to a potential borrower). The Company expects that these best efforts forward loan sale commitments will experience a net neutral shift in fair value with related derivative loan commitments. The aggregate amount of net realized gains or losses on sales of such loans included within mortgage banking income was $4.5 million and $705,000 for the three month periods ended March 31, 2020 and 2019 , respectively. Balance Sheet Offsetting The Company does not offset fair value amounts recognized for derivative instruments. 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. A daily settlement occurs through the CME for changes in the fair value of centrally cleared derivatives. Not all of the derivatives are required to be cleared through the daily clearing agent. As a result, the total fair values of loan level derivative assets and liabilities recognized on the Company's financial statements are not equal and offsetting. The table below presents the fair value of the Company’s derivative financial instruments as well as their classification on the balance sheet and the potential effect of netting arrangements on its financial position, at the dates indicated: Asset Derivatives (1) Liability Derivatives (2) Fair Value at Fair Value at Fair Value at Fair Value at March 31 December 31 March 31 December 31 (Dollars in thousands) Derivatives designated as hedges Interest rate derivatives $ 57,274 (3) $ 23,140 (3) $ 1,790 (4) $ 197 (4) Derivatives not designated as hedges Customer Related Positions Loan level derivatives 143,763 (3) 52,374 (3) 143,782 (4) 52,369 (4) Foreign exchange contracts 2,047 1,191 1,987 1,149 Mortgage Derivatives Interest rate lock commitments 2,332 1,680 — — Forward sale loan commitments 399 — — 12 Forward sale hedge commitments — — 1,980 196 Total derivatives not designated as hedges 148,541 55,245 147,749 53,726 Total 205,815 78,385 149,539 53,923 Netting Adjustments (5) — — 13,024 — Net Derivatives on the Balance Sheet 205,815 78,385 136,515 53,923 Financial instruments (6) 57,276 24,882 57,276 24,882 Cash collateral pledged (received) — — 73,771 25,493 Net Derivative Amounts $ 148,539 $ 53,503 $ 5,468 $ 3,548 (1) All asset derivatives are located in other assets on the balance sheet. (2) All liability derivatives are located in other liabilities on the balance sheet. (3) Approximately $574,000 and $1.1 million of accrued interest receivable is included in the fair value of the interest rate and loan level asset derivatives, respectively, as of March 31, 2020 . Accrued interest receivable of approximately and $350,000 and $569,000 was excluded from the fair value of the interest rate and loan level asset derivatives, respectively, as of December 31, 2019 . (4) Approximately $14,000 and $1.1 million of accrued interest payable is included in the fair value of the interest rate and loan level derivative liabilities, respectively, as of March 31, 2020 . Accrued interest payable of approximately $4,000 and $569,000 was excluded from the fair value of the interest rate and loan level derivative liabilities, respectively, as of December 31, 2019 . (5) Netting adjustments represent the amounts recorded to convert derivative assets and liabilities cleared through CME from a gross basis to a net basis, inclusive of the variation margin payments, in accordance with applicable accounting guidance. All derivatives that cleared through the CME were in a net liability position as of March 31, 2020 . (6) Reflects offsetting derivative positions with the same counterparty that are not netted on the balance sheet. The table below presents the effect of the Company’s derivative financial instruments included in OCI and current earnings for the periods indicated: Three Months Ended March 31 2020 2019 (Dollars in thousands) Derivatives designated as hedges Gain in OCI on derivatives (effective portion), net of tax $ 22,984 $ 3,285 Gain reclassified from OCI into interest income or interest expense (effective portion) $ 1,586 $ 424 Loss reclassified from OCI into noninterest expense (loss on termination) $ — $ — Interest expense $ — $ — Other expense — — Total $ — $ — Derivatives not designated as hedges Changes in fair value of customer related positions Other income $ 22 $ 13 Other expense (24 ) (1 ) Changes in fair value of mortgage derivatives Mortgage banking income (expense) (721 ) 59 Total $ (723 ) $ 71 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 $88.3 million and $26.0 million at March 31, 2020 and December 31, 2019 , respectively. Although none of the contingency provisions have applied as of March 31, 2020 and December 31, 2019 , 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 institutional counterparties is remote. The Company's exposure relating to institutional counterparties was $57.3 million and $25.4 million at March 31, 2020 and December 31, 2019 , respectively. The Company’s exposure relating to customer counterparties was approximately $143.7 million and $51.0 million at March 31, 2020 and December 31, 2019 , respectively. Credit exposure may be reduced by the value of collateral pledged by the counterparty.

Income Taxes (Notes)

Income Taxes (Notes)	3 Months Ended
	Mar. 31, 2020
Income Tax Disclosure [Abstract]
Income Tax Disclosure [Text Block]	INCOME TAXES The following table sets forth information regarding the Company’s tax provision and applicable tax rates for the periods indicated: Three Months Ended March 31 2020 2019 (Dollars in thousands) Combined federal and state income tax provision $ 2,148 $ 11,522 Effective income tax rate 7.43 % 24.65 % The Company's provision for income taxes was $2.1 million and $11.5 million for the three months ended March 31, 2020 and 2019, respectively. The lower tax provision in 2020 was due to a lower effective tax rate, which included a $4.7 million

Fair Value Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2020
Fair Value Disclosures [Abstract]
FAIR VALUE MEASUREMENTS	FAIR VALUE MEASUREMENTS 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 assumptions applied by the Company when determining fair value reflect those that the Company determines market participants would use to price 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 if the asset were to be sold or that would be or paid if the liability were to be transferred in an orderly market transaction (that is, not a forced liquidation or distressed sale) between market participants at the measurement date under current market conditions. When determining fair value, the Company considers pricing information and other inputs that are current as of the measurement date. In periods of market dislocation, the observability of prices and other inputs may be reduced for certain instruments, or not available at all. The unavailability or reduced availability of pricing or other input information 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 transactions, 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 interest rate derivatives may also 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 March 31, 2020 and December 31, 2019 , 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 properly classified as 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. Individually Assessed Collateral Dependent Loans In accordance with the CECL standard, expected credit losses on individually assessed loans deemed to be collateral dependent are valued based upon the lower of amortized 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 in such cases 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 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. The fair values are generally estimated based upon recent appraisal values of the property less costs to sell the property. Certain inputs used in appraisals are not always observable, and therefore OREO and Other Foreclosed Assets may be classified as Level 3 within the fair value hierarchy. Goodwill and Other Intangible Assets Goodwill and other 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. 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 a 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 Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) March 31, 2020 (Dollars in thousands) Recurring fair value measurements Assets Trading securities $ 2,247 $ 2,247 $ — $ — Equity securities 19,439 19,439 — — Securities available for sale U.S. government agency securities 24,292 — 24,292 — Agency mortgage-backed securities 258,784 — 258,784 — Agency collateralized mortgage obligations 87,210 — 87,210 — State, county, and municipal securities 1,144 — 1,144 — Single issuer trust preferred securities issued by banks and insurers 436 — 436 — Pooled trust preferred securities issued by banks and insurers 1,009 — — 1,009 Small business administration pooled securities 64,421 — 64,421 — Loans held for sale 43,756 — 43,756 — Derivative instruments 205,815 — 205,815 — Liabilities Derivative instruments 149,539 — 149,539 — Total recurring fair value measurements $ 559,014 $ 21,686 $ 536,319 $ 1,009 Nonrecurring fair value measurements Assets Individually assessed collateral dependent loans $ 39,444 $ — $ — $ 39,444 Total nonrecurring fair value measurements $ 39,444 $ — $ — $ 39,444 Fair Value Measurements at Reporting Date Using Balance Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) December 31, 2019 (Dollars in thousands) Recurring fair value measurements Assets Trading securities $ 2,179 $ 2,179 $ — $ — Equity securities 21,261 21,261 — — Securities available for sale U.S. government agency securities 33,115 — 33,115 — Agency mortgage-backed securities 247,000 — 247,000 — Agency collateralized mortgage obligations 88,511 — 88,511 — State, county, and municipal securities 1,396 — 1,396 — Single issuer trust preferred securities issued by banks and insurers 493 — 493 — Pooled trust preferred securities issued by banks and insurers 1,114 — — 1,114 Small business administration pooled securities 54,795 — 54,795 — Loans held for sale 33,307 — 33,307 — Derivative instruments 78,385 — 78,385 — Liabilities Derivative instruments 53,923 — 53,923 — Total recurring fair value measurements $ 507,633 $ 23,440 $ 483,079 $ 1,114 Nonrecurring fair value measurements: Assets Collateral dependent impaired loans $ 25,515 $ — $ — $ 25,515 Total nonrecurring fair value measurements $ 25,515 $ — $ — $ 25,515 The table below presents a reconciliation for all assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3), which were valued using pricing models and discounted cash flow methodologies, as of the dates indicated: Three Months Ended March 31 2020 2019 (Dollars in thousands) Pooled Trust Preferred Securities Beginning balance $ 1,114 $ 1,329 Gains and (losses) (realized/unrealized) Included in earnings — — Included in other comprehensive income (60 ) 3 Settlements (45 ) (18 ) Ending balance $ 1,009 $ 1,314 The following table sets forth certain unobservable inputs regarding the Company’s financial instruments that are classified as Level 3 for the periods indicated: March 31 December 31 March 31 December 31 March 31 December 31 Valuation Technique Fair Value Unobservable Inputs Range Weighted Average (Dollars in thousands) Discounted cash flow methodology Pooled trust preferred securities $ 1,009 $ 1,114 Cumulative prepayment 0% - 57% 0% - 57% 2.4% 2.6% Cumulative default 4% - 100% 2% - 100% 13.5% 13.5% Loss given default 85% - 100% 85% - 100% 93.6% 93.6% Cure given default 0% - 75% 0% - 75% 60.9% 60.9% Appraisals of collateral(1) Individually assessed collateral dependent loans $ 39,444 n/a Collateral dependent impaired loans n/a $ 25,515 (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 default rates, loss given default rates and cure given default rates. 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) March 31, 2020 (Dollars in thousands) Financial assets Securities held to maturity(a) U.S. Treasury securities $ 4,029 $ 4,139 $ — $ 4,139 $ — Agency mortgage-backed securities 463,632 482,363 — 482,363 — Agency collateralized mortgage obligations 277,921 289,902 — 289,902 — Single issuer trust preferred securities issued by banks 1,500 1,490 — 1,490 — Small business administration pooled securities 30,716 31,461 — 31,461 — Loans, net of allowance for credit losses(b) 8,784,610 8,626,697 — — 8,626,697 Federal Home Loan Bank stock(c) 23,274 23,274 — 23,274 — Cash surrender value of life insurance policies(d) 197,772 197,772 — 197,772 — Financial liabilities Deposit liabilities, other than time deposits(e) $ 8,146,490 $ 8,146,490 $ — $ 8,146,490 $ — Time certificates of deposits(f) 1,269,708 1,279,983 — 1,279,983 — Federal Home Loan Bank borrowings(f) 358,591 359,249 — 359,249 — Long-term borrowings(f) 74,920 73,572 — 73,572 — Junior subordinated debentures(g) 62,849 61,528 — 61,528 — Subordinated debentures(f) 49,625 51,896 — — 51,896 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, 2019 (Dollars in thousands) Financial assets Securities held to maturity(a) U.S. government agency securities $ 12,874 $ 12,997 $ — $ 12,997 $ — U.S. Treasury securities 4,032 4,053 $ — 4,053 $ — Agency mortgage-backed securities 397,414 405,802 — 405,802 — Agency collateralized mortgage obligations 293,662 297,314 — 297,314 — Single issuer trust preferred securities issued by banks 1,500 1,490 — 1,490 — Small business administration pooled securities 31,324 31,607 — 31,607 — Loans, net of allowance for credit losses(b) 8,780,384 8,613,635 — — 8,613,635 Federal Home Loan Bank stock(c) 14,424 14,424 — 14,424 — Cash surrender value of life insurance policies(d) 197,372 197,372 — 197,372 — Financial liabilities Deposit liabilities, other than time deposits(e) $ 7,752,052 $ 7,752,052 $ — $ 7,752,052 $ — Time certificates of deposits(f) 1,395,315 1,396,760 — 1,396,760 — Federal Home Loan Bank borrowings(f) 115,748 115,881 — 115,881 — Long-term borrowings (f) 74,906 72,219 — 72,219 — Junior subordinated debentures(g) 62,848 65,603 — 65,603 — Subordinated debentures(f) 49,601 52,870 — — 52,870 (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 of loans is measured using the exit price valuation method, determined primarily 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, while incorporating liquidity and credit assumptions. 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. The Company considers its current use of financial instruments to be the highest and best use of the instruments.

Revenue Recognition (Notes)

Revenue Recognition (Notes)	3 Months Ended
	Mar. 31, 2020
Revenue Recognition [Abstract]
Revenue from Contract with Customer [Text Block]	REVENUE RECOGNITION 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: Three Months Ended March 31 March 31 (Dollars in thousands) Deposit account fees (inclusive of cash management fees) $ 4,970 $ 4,406 Interchange fees 4,104 3,735 ATM fees 639 666 Investment management - wealth management and advisory services 6,289 6,069 Investment management - retail investments and insurance revenue 540 679 Merchant processing income 393 280 Credit card income 183 — Other noninterest income 1,212 939 Total noninterest income in-scope of ASC 606 18,330 16,774 Total noninterest income out-of-scope of ASC 606 8,105 4,759 Total noninterest income $ 26,435 $ 21,533 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 a 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 into 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: March 31, 2020 December 31, 2019 (Dollars in thousands) Receivables, included in other assets $ 1,912 $ 2,341 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. Credit Card Income The Company provides consumer and business credit card solutions to its customers by soliciting new accounts on behalf of a third party credit card provider in exchange for a fee. The income earned is comprised of new account incentive payments as well as a percentage of interchange income earned by the third party provider offering the consumer and business purpose revolving credit accounts. The credit card income is recognized in conjunction with the establishment of each new credit card member or as the interchange is earned by the third party in connection with net purchase transactions made by the credit card member. 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

Comprehensive Income_Loss

Comprehensive Income/Loss	3 Months Ended
	Mar. 31, 2020
Equity [Abstract]
COMPREHENSIVE INCOME/LOSS	OTHER COMPREHENSIVE INCOME (LOSS) The following tables present 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): Three Months Ended Pre Tax Tax (Expense) After Tax (Dollars in thousands) Change in fair value of securities available for sale $ 12,123 $ (2,776 ) $ 9,347 Less: net security losses reclassified into other noninterest expense — — — Net change in fair value of securities available for sale 12,123 (2,776 ) 9,347 Change in fair value of cash flow hedges 33,567 (9,443 ) 24,124 Less: net cash flow hedge gains reclassified into interest income or interest expense 1,586 (446 ) 1,140 Net change in fair value of cash flow hedges 31,981 (8,997 ) 22,984 Net unamortized loss related to defined benefit pension and other postretirement adjustments arising during the period (1,389 ) 391 (998 ) Amortization of net actuarial losses 245 (69 ) 176 Amortization of net prior service costs 69 (19 ) 50 Net change in other comprehensive income for defined benefit postretirement plans (1) (1,075 ) 303 (772 ) Total other comprehensive income $ 43,029 $ (11,470 ) $ 31,559 Three Months Ended Pre Tax Tax (Expense) After Tax (Dollars in thousands) Change in fair value of securities available for sale $ 6,178 $ (1,449 ) $ 4,729 Less: net security gains reclassified into other noninterest income (expense) — — — Net change in fair value of securities available for sale 6,178 (1,449 ) 4,729 Change in fair value of cash flow hedges 4,996 (1,406 ) 3,590 Less: net cash flow hedge gains reclassified into interest income or interest expense 424 (119 ) 305 Net change in fair value of cash flow hedges 4,572 (1,287 ) 3,285 Net unamortized loss related to defined benefit pension and other postretirement adjustments arising during the period (11 ) 3 (8 ) Amortization of net actuarial gains (2 ) 1 (1 ) Amortization of net prior service costs 69 (20 ) 49 Net change in other comprehensive income for defined benefit postretirement plans (1) 56 (16 ) 40 Total other comprehensive income $ 10,806 $ (2,752 ) $ 8,054 (1) The amortization of prior service costs is included in the computation of net periodic pension cost as disclosed in the Employee Benefit Plans footnote in the Company's Annual Report on Form 10-K for the year ended December 31, 2019 , filed with the Securities and Exchange Commission. 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 on Cash Flow Hedge Defined Benefit Postretirement Plans Accumulated Other Comprehensive Income (Loss) (Dollars in thousands) 2020 Beginning balance: January 1, 2020 $ 4,398 $ 16,479 $ (2,708 ) $ 18,169 Net change in other comprehensive income (loss) 9,347 22,984 (772 ) 31,559 Ending balance: March 31, 2020 $ 13,745 $ 39,463 $ (3,480 ) $ 49,728 2019 Beginning balance: January 1, 2019 $ (5,947 ) $ 6,148 $ (1,374 ) $ (1,173 ) Net change in other comprehensive income (loss) 4,729 3,285 40 8,054 Ending balance: March 31, 2019 $ (1,218 ) $ 9,433 $ (1,334 ) $ 6,881

Commitments and contingencies

Commitments and contingencies	3 Months Ended
	Mar. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies Disclosure [Text Block]	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, and loans sold with recourse, 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 Company's 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: March 31, 2020 December 31, 2019 (Dollars in thousands) Commitments to extend credit $ 3,296,926 $ 3,337,930 Standby letters of credit 20,100 21,565 Deferred standby letter of credit fees 166 158 Loans sold with recourse 426,342 404,532 Lease Commitments The Company leases office space, space for ATM locations, and certain branch locations under noncancelable operating leases. Several of these leases contain renewal options to extend lease terms for a period of 1 to 10 years . There has been no significant change in the future minimum lease payments payable by the Company since December 31, 2019 . See the Company's Annual Report on Form 10-K for the fiscal year ended December 31, 2019 for information regarding leases and other commitments. Other Contingencies At March 31, 2020 , 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. There was no reserve requirement at March 31, 2020 and December 31, 2019 , respectively.

Investments is Low Income Housi

Investments is Low Income Housing Tax Credits Investments in Low Income Housing Tax Credits	3 Months Ended
	Mar. 31, 2020
Equity Method Investments and Joint Ventures [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 the dates indicated: March 31 December 31 (Dollars in thousands) Original investment value $ 110,669 $ 96,275 Current recorded investment 84,679 72,510 Unfunded liability obligation 43,427 34,967 Tax credits and benefits 11,194 (1) 7,342 Amortization of investments 9,211 (2) 5,645 Net income tax benefit 1,983 (3) 1,696 (1) This amount reflects anticipated tax credits and tax benefits for the full year ended December 31, 2020 . (2) The amortization amount reduces the tax credits and benefits anticipated for the full year ended December 31, 2020 . (3) This amount represents the net tax benefit expected to be realized for the full year ended December 31, 2020 in determining the Company's effective tax rate.

Subsequent Events (Notes)

Subsequent Events (Notes)	3 Months Ended
	Mar. 31, 2020
Subsequent Events [Abstract]
Subsequent Events [Text Block]	SUBSEQUENT EVENTS Subsequent to March 31, 2020 the Company participated in the government-sponsored Payroll Protection Program ("PPP"), helping to deploy stimulus funds to small businesses within the community. As of the filing date, the Company has processed loans, with an aggregate dollar value of $818.9 million . The average and median loan sizes of the PPP loans for which the Company has obtained an SBA guarantee are approximately $160,000 and $41,000 , respectively. Additionally, the Company anticipates receiving $25.9 million in process fee income for the loans that have been issued under the PPP, which will be deferred through net interest income over the life of the loans. Additionally, the Company has been offering needs based payment relief options for commercial and small business loans, residential mortgages, and home equity loans and lines of credit and monitors loan modification requests daily. These modifications will not be accounted as TDRs if the borrower was in compliance with the terms of their loans as of December 31, 2019. The following table summarizes the loan modification requests through the date of this filing which are anticipated to be approved: Loan Modification Requests by Loan Category: # of Loans % of Total Loans (#) Balance as of March 31, 2020 % of Total Loans ($) (Dollars in thousands) Commercial and industrial 308 0.69 % $ 163,889 1.84 % Commercial real estate 557 1.27 % 967,643 10.86 % Construction 19 0.04 % 37,811 0.42 % Small Business 289 0.65 % 21,781 0.24 % Residential real estate 438 0.99 % 185,530 2.08 % Home equity 308 0.69 % 44,695 0.50 % Other consumer 22 0.05 % 559 0.01 % Total 1,941 4.38 % $ 1,421,908 15.95 %

Basis of Presentation Basis of

Basis of Presentation Basis of Presentation (Policies)	3 Months Ended
	Mar. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Accounting Policy	Independent Bank Corp. (the “Company”) is a state chartered, federally registered bank holding company, incorporated in 1985. The Company is the sole stockholder of Rockland Trust Company (“Rockland Trust” or the “Bank”), a Massachusetts trust company chartered in 1907. All material intercompany balances and transactions have been eliminated in consolidation. Certain previously reported amounts have been reclassified to conform to the current year’s presentation. The accompanying unaudited consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP") for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and notes required by GAAP for complete financial statements. In the opinion of management, all adjustments considered necessary for a fair presentation of the financial statements, primarily consisting of normal recurring adjustments, have been included. Results for the quarter ended March 31, 2020 are not necessarily indicative of the results that may be expected for the year ending December 31, 2020 or any other interim period. For further information, refer to the consolidated financial statements and notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2019 , filed with the Securities and Exchange Commission.

Securities (Tables)

Securities (Tables)	3 Months Ended
	Mar. 31, 2020
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 relate to equity securities for the periods indicated: Three Months Ended March 31 2020 2019 Net gains (losses) recognized during the period on equity securities $ (1,801 ) $ 907 Less: net gains recognized during the period on equity securities sold during the period 6 3 Unrealized gains (losses) recognized during the reporting period on equity securities still held at the reporting date $ (1,807 ) $ 904
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Table Text Block]	These available for sale securities are aggregated by major security type and length of time that individual securities have been in a continuous unrealized loss position: March 31, 2020 Less than 12 months 12 months or longer Total # of holdings Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses (Dollars in thousands) Agency mortgage-backed securities 1 86 (1 ) — — 86 (1 ) Single issuer trust preferred securities issued by banks and insurers 1 436 (53 ) — — 436 (53 ) Pooled trust preferred securities issued by banks and insurers 1 — — 1,009 (434 ) 1,009 (434 ) Total temporarily impaired available for sale securities 3 $ 522 $ (54 ) $ 1,009 $ (434 ) $ 1,531 $ (488 )
Debt Securities, Held-to-maturity [Table Text Block]	The following table summarizes the amortized cost, fair value and allowance for credit losses of held to maturity securities and the corresponding amounts of gross unrealized gains and losses recognized in accumulated other comprehensive income(loss) as of the dates indicated: March 31, 2020 December 31, 2019 Amortized Gross Gross Unrealized Allowance for credit losses Fair Amortized Gross Gross Unrealized Fair (Dollars in thousands) U.S. government agency securities $ — $ — $ — $ — $ — $ 12,874 $ 123 $ — $ 12,997 U.S. Treasury securities 4,029 110 — — 4,139 4,032 21 — 4,053 Agency mortgage-backed securities 463,632 18,864 (133 ) — 482,363 397,414 8,445 (57 ) 405,802 Agency collateralized mortgage obligations 277,921 11,981 — — 289,902 293,662 4,501 (849 ) 297,314 Single issuer trust preferred securities issued by banks 1,500 — (10 ) — 1,490 1,500 — (10 ) 1,490 Small business administration pooled securities 30,716 745 — — 31,461 31,324 338 (55 ) 31,607 Total held to maturity securities $ 777,798 $ 31,700 $ (143 ) $ — $ 809,355 $ 740,806 $ 13,428 $ (971 ) $ 753,263
Debt Securities, Held-to-maturity, Credit Quality Indicator [Table Text Block]	s of March 31, 2020 , all held to maturity securities held by the Company were rated investment grade or higher.
Schedule of contractual maturities of securities [Table Text Block]	A schedule of the contractual maturities of available for sale and held to maturity securities as of March 31, 2020 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 $ — $ — $ 10,002 $ 10,351 $ 12,472 $ 13,941 $ — $ — $ 22,474 $ 24,292 Agency mortgage-backed securities — — 72,092 75,268 41,885 44,607 133,698 138,909 247,675 258,784 Agency collateralized mortgage obligations — — — — — — 83,183 87,210 83,183 87,210 State, county, and municipal securities 250 250 687 691 189 203 — — 1,126 1,144 Single issuer trust preferred securities issued by banks — — — — — — 489 436 489 436 Pooled trust preferred securities issued by banks and insurers — — — — — — 1,443 1,009 1,443 1,009 Small business administration pooled securities — — — — — — 63,062 64,421 63,062 64,421 Total available for sale securities $ 250 $ 250 $ 82,781 $ 86,310 $ 54,546 $ 58,751 $ 281,875 $ 291,985 $ 419,452 $ 437,296 Held to maturity securities U.S. Treasury securities $ — $ — $ 4,029 $ 4,139 $ — $ — $ — $ — $ 4,029 $ 4,139 Agency mortgage-backed securities 8,619 8,715 1,902 1,951 48,123 50,345 404,988 421,352 463,632 482,363 Agency collateralized mortgage obligations — — — — — — 277,921 289,902 277,921 289,902 Single issuer trust preferred securities issued by banks — — — — 1,500 1,490 — — 1,500 1,490 Small business administration pooled securities — — — — — — 30,716 31,461 30,716 31,461 Total held to maturity securities $ 8,619 $ 8,715 $ 5,931 $ 6,090 $ 49,623 $ 51,835 $ 713,625 $ 742,715 $ 777,798 $ 809,355 Total $ 8,869 $ 8,965 $ 88,712 $ 92,400 $ 104,169 $ 110,586 $ 995,500 $ 1,034,700 $ 1,197,250 $ 1,246,651
Schedule of gross unrealized losses and fair value of investments [Table Text Block]	The following table shows the gross unrealized losses and fair value of the Company’s investments in an unrealized loss position, which the Company had not deemed to be OTTI, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position as of December 31, 2019: December 31, 2019 Less than 12 months 12 months or longer Total # of holdings Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses (Dollars in thousands) Agency mortgage-backed securities 12 34,009 (59 ) 243 (2 ) 34,252 (61 ) Agency collateralized mortgage obligations 17 48,476 (215 ) 37,382 (653 ) 85,858 (868 ) Single issuer trust preferred securities issued by banks and insurers 1 — — 1,490 (10 ) 1,490 (10 ) Pooled trust preferred securities issued by banks and insurers 1 — — 1,114 (374 ) 1,114 (374 ) Small business administration pooled securities 1 7,349 (55 ) — — 7,349 (55 ) Total temporarily impaired securities 32 $ 89,834 $ (329 ) $ 40,229 $ (1,039 ) $ 130,063 $ (1,368 )
Schedule of Available-for-sale Securities Reconciliation [Table Text Block]	The following table summarizes the amortized cost, allowance for credit losses, and fair value of available for sale securities and the corresponding amounts of gross unrealized gains and losses recognized in accumulated other comprehensive income(loss) as of the dates indicated: March 31, 2020 December 31, 2019 Amortized Gross Gross Unrealized Allowance for credit losses Fair Amortized Gross Gross Unrealized Fair (Dollars in thousands) U.S. government agency securities $ 22,474 $ 1,818 $ — $ — $ 24,292 $ 32,473 $ 642 $ — $ 33,115 Agency mortgage-backed securities 247,675 11,110 (1 ) — 258,784 243,548 3,456 (4 ) 247,000 Agency collateralized mortgage obligations 83,183 4,027 — — 87,210 87,305 1,225 (19 ) 88,511 State, county, and municipal securities 1,126 18 — — 1,144 1,377 19 — 1,396 Single issuer trust preferred securities issued by banks 489 — (53 ) — 436 488 5 — 493 Pooled trust preferred securities issued by banks and insurers 1,443 — (434 ) — 1,009 1,488 — (374 ) 1,114 Small business administration pooled securities 63,062 1,359 — — 64,421 54,024 771 — 54,795 Total available for sale securities $ 419,452 $ 18,332 $ (488 ) $ — $ 437,296 $ 420,703 $ 6,118 $ (397 ) $ 426,424

Loans, Allowance for Credit L_2

Loans, Allowance for Credit Losses and Credit Quality (Tables)	3 Months Ended
	Mar. 31, 2020
Receivables [Abstract]
Financing Receivable, Allowance for Credit Loss [Table Text Block]	The following table summarizes the change in allowance for credit losses by loan category, and bifurcates the amount of loans allocated to each loan category for the period indicated: Three Months Ended March 31, 2020 (Dollars in thousands) Commercial and Commercial Commercial Small Residential Other Consumer Total Allowance for credit losses Beginning balance, pre adoption of Topic 326 $ 17,594 $ 32,935 $ 6,053 $ 1,746 $ 3,440 $ 5,576 $ 396 $ 67,740 Cumulative effect accounting adjustment (1) (1,984 ) (13,048 ) (3,652 ) 495 9,828 7,012 212 (1,137 ) Cumulative effect accounting adjustment (2) 49 337 — — 423 319 29 1,157 Charge-offs — — — 109 — 138 487 734 Recoveries 42 — — 3 1 58 246 350 Provision for credit loss expense 5,948 9,274 1,346 1,694 1,155 5,083 500 25,000 Ending balance (3) $ 21,649 $ 29,498 $ 3,747 $ 3,829 $ 14,847 $ 17,910 $ 896 $ 92,376 (1) Represents adjustment needed to reflect the cumulative day one impact pursuant to the Company's adoption of Accounting Standards Update 2016-13. The adjustment represents a $1.1 million decrease to the allowance attributable to the change in accounting methodology for estimating the allowance for credit losses resulting from the Company's adoption of the standard. (2) Represents adjustment needed to reflect the day one re-class of the Company's PCI loan balances to PCD and the associated gross-up, pursuant to the Company's adoption of Accounting Standards Update 2016-13. The adjustment represents a $1.2 million increase to the allowance resulting from the day one re-class. (3) Balances of accrued interest receivable excluded from amortized cost and the calculation of allowance for credit losses amounted to $25.9 million as of March 31, 2020. The following table summarizes changes in allowance for loan losses by loan category for the period indicated: Three Months Ended March 31, 2019 (Dollars in thousands) Commercial and Industrial Commercial Real Estate Commercial Construction Small Business Residential Real Estate Home Equity Other Consumer Total Allowance for loan losses Beginning balance $ 15,760 $ 32,370 $ 5,158 $ 1,756 $ 3,219 $ 5,608 $ 422 $ 64,293 Charge-offs — — — (145 ) — (113 ) (301 ) (559 ) Recoveries 124 33 — 27 1 66 155 406 Provision (benefit) 988 (354 ) 197 146 14 (54 ) 63 1,000 Ending balance $ 16,872 $ 32,049 $ 5,355 $ 1,784 $ 3,234 $ 5,507 $ 339 $ 65,140 Ending balance: collectively evaluated for impairment $ 16,814 $ 31,974 $ 5,355 $ 1,783 $ 2,432 $ 5,346 $ 332 $ 64,036 Ending balance: individually evaluated for impairment $ 58 $ 75 $ — $ 1 $ 802 $ 161 $ 7 $ 1,104
Financing Receivable Credit Quality Indicators [Table Text Block]	he following table details the amortized cost balances of the Company's loan portfolios, presented by credit quality indicator and origination year as of March 31, 2020: March 31, 2020 2020 2019 2018 2017 2016 Prior Revolving Loans Revolving converted to Term Total (Dollars in thousands) Commercial and Pass $ 119,886 $ 213,925 $ 138,376 $ 50,323 $ 36,685 $ 33,576 $ 736,304 $ 327 $ 1,329,402 Potential weakness 362 5,432 1,489 4,909 725 697 21,780 50 35,444 Definite weakness - loss unlikely 495 2,128 26,006 5,589 2,604 1,575 44,932 — 83,329 Partial loss probable — — — — — 49 — — 49 Definite loss — — — — — — — — — Total commercial and industrial $ 120,743 $ 221,485 $ 165,871 $ 60,821 $ 40,014 $ 35,897 $ 803,016 $ 377 $ 1,448,224 Commercial real estate Pass $ 260,217 $ 943,205 $ 586,125 $ 651,335 $ 468,824 $ 945,248 $ 48,056 $ 2,987 $ 3,905,997 Potential weakness 1,809 8,303 33,755 8,506 9,851 42,382 — — 104,606 Definite weakness - loss unlikely — 3,612 7,432 20,395 6,993 12,312 — — 50,744 Partial loss probable — — — — — — — — — Definite loss — — — — — — — — — Total commercial real estate $ 262,026 $ 955,120 $ 627,312 $ 680,236 $ 485,668 $ 999,942 $ 48,056 $ 2,987 $ 4,061,347 Commercial construction Pass $ 43,369 $ 221,773 $ 114,561 $ 73,493 $ — $ 6,867 $ 44,225 $ 325 $ 504,613 Potential weakness — 554 347 19,044 — — 347 — 20,292 Definite weakness - loss unlikely — — 1,887 — — — 346 — 2,233 Partial loss probable — — — — — — — — — Definite loss — — — — — — — — — Total commercial construction $ 43,369 $ 222,327 $ 116,795 $ 92,537 $ — $ 6,867 $ 44,918 $ 325 $ 527,138 Small business Pass $ 8,414 $ 31,651 $ 25,184 $ 17,848 $ 17,594 $ 26,734 $ 47,109 $ — $ 174,534 Potential weakness — 12 18 13 753 259 597 — 1,652 Definite weakness - loss unlikely — 47 133 51 169 598 636 — 1,634 Partial loss probable — — — — — — — — — Definite loss — — — — — — — — — Total small business $ 8,414 $ 31,710 $ 25,335 $ 17,912 $ 18,516 $ 27,591 $ 48,342 $ — $ 177,820 Residential real estate Pass $ 39,122 $ 204,524 $ 260,899 $ 210,662 $ 283,255 $ 523,742 $ — $ — $ 1,522,204 Default — — 427 435 — 5,350 — — 6,212 Total residential real estate $ 39,122 $ 204,524 $ 261,326 $ 211,097 $ 283,255 $ 529,092 $ — $ — $ 1,528,416 Home equity Pass $ 23,397 $ 75,161 $ 70,081 $ 67,740 $ 51,106 $ 138,733 $ 715,169 $ 1,853 $ 1,143,240 Default — — — 18 — 579 2,372 61 3,030 Total home equity $ 23,397 $ 75,161 $ 70,081 $ 67,758 $ 51,106 $ 139,312 $ 717,541 $ 1,914 $ 1,146,270 Other consumer Pass $ 414 $ 705 $ 356 $ 1,049 $ 1,000 $ 10,850 $ 12,767 $ — $ 27,141 Default — — — 19 — 39 16 — 74 Total other consumer $ 414 $ 705 $ 356 $ 1,068 $ 1,000 $ 10,889 $ 12,783 $ — $ 27,215 Total $ 497,485 $ 1,711,032 $ 1,267,076 $ 1,131,429 $ 879,559 $ 1,749,590 $ 1,674,656 $ 5,603 $ 8,916,430 The following tables detail the amount of outstanding principal balances relative to each of the risk-rating categories for the Company’s loan portfolio as of December 31, 2019: December 31, 2019 Category Risk Rating Commercial and Industrial Commercial Real Estate Commercial Construction Small Business Total (Dollars in thousands) Pass 1 - 6 $ 1,274,155 $ 3,860,555 $ 542,608 $ 171,213 $ 5,848,531 Potential weakness 7 63,485 97,268 2,247 1,416 164,416 Definite weakness-loss unlikely 8 57,396 44,536 2,438 1,868 106,238 Partial loss probable 9 — — — — — Definite loss 10 — — — — — Total $ 1,395,036 $ 4,002,359 $ 547,293 $ 174,497 $ 6,119,185
Foreclosed Residential Real Estate Property [Table Text Block]	The following table shows information regarding foreclosed residential real estate property at the dates indicated: March 31, 2020 December 31, 2019 (Dollars in thousands) Foreclosed residential real estate property held by the creditor $ — $ — Recorded investment in mortgage loans collateralized by residential real estate property that are in the process of foreclosure $ 4,580 $ 3,294
Financing Receivable Credit Quality Indicators For Consumer And Residential Portfolio Table Text Block	The following table shows the weighted average FICO scores and the weighted average combined LTV ratios as of the periods indicated below: March 31 December 31 Residential portfolio FICO score (re-scored)(1) 749 749 LTV (re-valued)(2) 58.1 % 59.0 % Home equity portfolio FICO score (re-scored)(1) 768 767 LTV (re-valued)(2)(3) 46.9 % 46.6 % (1) The average FICO scores at March 31, 2020 are based upon rescores available from February 2020 and origination score data for loans booked in March 2020. The average FICO scores at December 31, 2019 were based upon rescores available from November 2019 and origination score data for loans booked in December 2019. (2) The combined LTV ratios for March 31, 2020 are based upon updated automated valuations as of March 2020, when available, and/or the most current valuation data available. The combined LTV ratios for December 31, 2019 were based upon updated automated valuations as of November 2019, 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.
Financing Receivable, Past Due [Table Text Block]	The following tables show the age analysis of past due financing receivables as of the dates indicated: March 31, 2020 30-59 days 60-89 days 90 days or more Total Past Due Total Financing Receivables Amortized Cost >90 Days and Accruing Number of Loans Principal Balance Number of Loans Principal Balance Number of Loans Principal Balance Number of Loans Principal Balance Current (Dollars in thousands) Loan Portfolio Commercial and industrial 13 $ 1,930 — $ — 6 $ 1,078 19 $ 3,008 $ 1,445,216 $ 1,448,224 $ — Commercial real estate 18 6,989 2 383 7 1,499 27 8,871 4,052,476 4,061,347 — Commercial construction 1 331 — — — — 1 331 526,807 527,138 — Small business 12 1,030 8 185 5 176 25 1,391 176,429 177,820 — Residential real estate 19 2,614 5 994 39 6,258 63 9,866 1,518,550 1,528,416 — Home equity 22 1,507 7 801 36 3,030 65 5,338 1,140,932 1,146,270 — Other consumer (1) 335 386 11 67 16 99 362 552 26,663 27,215 25 Total 420 $ 14,787 33 $ 2,430 109 $ 12,140 562 $ 29,357 $ 8,887,073 $ 8,916,430 $ 25 December 31, 2019 30-59 days 60-89 days 90 days or more Total Past Due Total Financing Receivables Recorded Investment >90 Days and Accruing Number of Loans Principal Balance Number of Loans Principal Balance Number of Loans Principal Balance Number of Loans Principal Balance Current (Dollars in thousands) Loan Portfolio Commercial and industrial 1 $ 253 2 $ 323 5 $ 760 8 $ 1,336 $ 1,393,700 $ 1,395,036 $ — Commercial real estate 7 1,690 1 194 8 2,038 16 3,922 3,998,437 4,002,359 218 (2 ) Commercial construction 1 560 — — — — 1 560 546,733 547,293 — Small business 11 837 3 15 6 115 20 967 173,530 174,497 — Residential real estate 17 2,237 17 3,055 38 7,020 72 12,312 1,578,257 1,590,569 1,652 (2 ) Home equity 23 1,689 8 524 40 3,854 71 6,067 1,127,731 1,133,798 265 (2 ) Other consumer (1) 387 245 12 44 16 32 415 321 29,766 30,087 22 Total 447 $ 7,511 43 $ 4,155 113 $ 13,819 603 $ 25,485 $ 8,848,154 $ 8,873,639 $ 2,157 (1) Other consumer portfolio is inclusive of deposit account overdrafts recorded as loan balances. (2) Represents purchased credit impaired loans that were accruing interest due to expectations of future cash collections.
Financing Receivable, Nonaccrual [Table Text Block]	The following table shows information regarding nonaccrual loans as of the dates indicated: Nonaccrual Balances March 31, 2020 December 31, 2019 With Allowance for Credit Losses Without Allowance for Credit Losses Total Total (Dollars in thousands) Commercial and industrial $ 1,078 $ 20,357 $ 21,435 $ 22,574 Commercial real estate 1,305 3,644 4,949 3,016 Commercial construction — — — — Small business 450 — 450 311 Residential real estate 11,001 3,501 14,502 13,360 Home equity 6,463 108 6,571 6,570 Other consumer 108 — 108 61 Total nonaccrual loans $ 20,405 $ 27,610 $ 48,015 (1) $ 45,892 (1) (1) Included in these amounts were $23.8 million and $24.8 million of nonaccruing TDRs at March 31, 2020 and December 31, 2019
Financing Receivable, Troubled Debt Restructuring [Table Text Block]	The following table shows the Company’s total TDRs and other pertinent information as of the dates indicated: March 31, 2020 December 31, 2019 (Dollars in thousands) TDRs on accrual status $ 18,129 $ 19,599 TDRs on nonaccrual 23,842 24,766 Total TDRs $ 41,971 $ 44,365 Amount of specific reserves included in the allowance for loan loss associated with TDRs n/a $ 855 Additional commitments to lend to a borrower who has been a party to a TDR $ 163 $ 63
Schedule of Debtor Troubled Debt Restructuring, Subsequent Periods [Table Text Block]	The following table shows the modifications which occurred during the period indicated and the change in the recorded investment subsequent to the modifications occurring: Three Months Ended March 31, 2020 Number of Contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment (Dollars in thousands) Troubled debt restructurings Commercial and industrial 2 $ 268 $ 268 Commercial real estate 1 604 604 Small business 1 49 25 Residential real estate 1 177 209 Total 5 $ 1,098 $ 1,106 Three Months Ended March 31, 2019 Number of Contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment (Dollars in thousands) Troubled debt restructurings Commercial real estate 1 150 150 Home equity 1 75 75 Total 2 $ 225 $ 225
Troubled Debt Restructurings On Financing Receivables Post Modifications Table Text Block	Three Months Ended March 31, 2019 Number of Contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment (Dollars in thousands) Troubled debt restructurings Commercial real estate 1 150 150 Home equity 1 75 75 Total 2 $ 225 $ 225 The following table shows the Company’s post-modification balance of TDRs listed by type of modification during the period indicated: Three Months Ended March 31 2020 2019 (Dollars in thousands) Adjusted interest rate $ 604 $ 150 Court ordered concession 25 75 Extended maturity 477 — Total $ 1,106 $ 225

Loans, Allowance for Loan Los_2

Loans, Allowance for Loan Losses and Credit Quality (Tables)	3 Months Ended
	Mar. 31, 2020
Financing Receivable, Allowance for Credit Loss [Line Items]
Tabular disclosure of financing receivables bifurcated by type of impairment evaluation [Table Text Block]	The following table bifurcates the amount of loans and the allowance allocated to each loan category based on the type of impairment analysis as of December 31, 2019: December 31, 2019 Commercial Commercial Commercial Small Residential Home Other Consumer Total (Dollars in thousands) Financing receivables ending balance: Collectively evaluated for impairment $ 1,370,580 $ 3,987,848 $ 547,293 $ 173,960 $ 1,571,848 $ 1,127,963 $ 29,663 $ 8,809,155 Individually evaluated for impairment 24,456 8,337 — 537 11,228 4,948 122 49,628 Purchased credit impaired loans — 6,174 — — 7,493 887 302 14,856 Total loans by group $ 1,395,036 $ 4,002,359 $ 547,293 $ 174,497 $ 1,590,569 $ 1,133,798 $ 30,087 $ 8,873,639 (1) (1) The amount of net deferred costs on originated loans included in the ending balance was $7.1 million at December 31, 2019 . Net unamortized discounts on acquired loans not deemed to be purchased credit impaired ("PCI") included in the ending balance was
Summary of changes in allowance for loan losses	The following table summarizes the change in allowance for credit losses by loan category, and bifurcates the amount of loans allocated to each loan category for the period indicated: Three Months Ended March 31, 2020 (Dollars in thousands) Commercial and Commercial Commercial Small Residential Other Consumer Total Allowance for credit losses Beginning balance, pre adoption of Topic 326 $ 17,594 $ 32,935 $ 6,053 $ 1,746 $ 3,440 $ 5,576 $ 396 $ 67,740 Cumulative effect accounting adjustment (1) (1,984 ) (13,048 ) (3,652 ) 495 9,828 7,012 212 (1,137 ) Cumulative effect accounting adjustment (2) 49 337 — — 423 319 29 1,157 Charge-offs — — — 109 — 138 487 734 Recoveries 42 — — 3 1 58 246 350 Provision for credit loss expense 5,948 9,274 1,346 1,694 1,155 5,083 500 25,000 Ending balance (3) $ 21,649 $ 29,498 $ 3,747 $ 3,829 $ 14,847 $ 17,910 $ 896 $ 92,376 (1) Represents adjustment needed to reflect the cumulative day one impact pursuant to the Company's adoption of Accounting Standards Update 2016-13. The adjustment represents a $1.1 million decrease to the allowance attributable to the change in accounting methodology for estimating the allowance for credit losses resulting from the Company's adoption of the standard. (2) Represents adjustment needed to reflect the day one re-class of the Company's PCI loan balances to PCD and the associated gross-up, pursuant to the Company's adoption of Accounting Standards Update 2016-13. The adjustment represents a $1.2 million increase to the allowance resulting from the day one re-class. (3) Balances of accrued interest receivable excluded from amortized cost and the calculation of allowance for credit losses amounted to $25.9 million as of March 31, 2020. The following table summarizes changes in allowance for loan losses by loan category for the period indicated: Three Months Ended March 31, 2019 (Dollars in thousands) Commercial and Industrial Commercial Real Estate Commercial Construction Small Business Residential Real Estate Home Equity Other Consumer Total Allowance for loan losses Beginning balance $ 15,760 $ 32,370 $ 5,158 $ 1,756 $ 3,219 $ 5,608 $ 422 $ 64,293 Charge-offs — — — (145 ) — (113 ) (301 ) (559 ) Recoveries 124 33 — 27 1 66 155 406 Provision (benefit) 988 (354 ) 197 146 14 (54 ) 63 1,000 Ending balance $ 16,872 $ 32,049 $ 5,355 $ 1,784 $ 3,234 $ 5,507 $ 339 $ 65,140 Ending balance: collectively evaluated for impairment $ 16,814 $ 31,974 $ 5,355 $ 1,783 $ 2,432 $ 5,346 $ 332 $ 64,036 Ending balance: individually evaluated for impairment $ 58 $ 75 $ — $ 1 $ 802 $ 161 $ 7 $ 1,104
Internal risk-rating categories for the Company's commercial portfolio	he following table details the amortized cost balances of the Company's loan portfolios, presented by credit quality indicator and origination year as of March 31, 2020: March 31, 2020 2020 2019 2018 2017 2016 Prior Revolving Loans Revolving converted to Term Total (Dollars in thousands) Commercial and Pass $ 119,886 $ 213,925 $ 138,376 $ 50,323 $ 36,685 $ 33,576 $ 736,304 $ 327 $ 1,329,402 Potential weakness 362 5,432 1,489 4,909 725 697 21,780 50 35,444 Definite weakness - loss unlikely 495 2,128 26,006 5,589 2,604 1,575 44,932 — 83,329 Partial loss probable — — — — — 49 — — 49 Definite loss — — — — — — — — — Total commercial and industrial $ 120,743 $ 221,485 $ 165,871 $ 60,821 $ 40,014 $ 35,897 $ 803,016 $ 377 $ 1,448,224 Commercial real estate Pass $ 260,217 $ 943,205 $ 586,125 $ 651,335 $ 468,824 $ 945,248 $ 48,056 $ 2,987 $ 3,905,997 Potential weakness 1,809 8,303 33,755 8,506 9,851 42,382 — — 104,606 Definite weakness - loss unlikely — 3,612 7,432 20,395 6,993 12,312 — — 50,744 Partial loss probable — — — — — — — — — Definite loss — — — — — — — — — Total commercial real estate $ 262,026 $ 955,120 $ 627,312 $ 680,236 $ 485,668 $ 999,942 $ 48,056 $ 2,987 $ 4,061,347 Commercial construction Pass $ 43,369 $ 221,773 $ 114,561 $ 73,493 $ — $ 6,867 $ 44,225 $ 325 $ 504,613 Potential weakness — 554 347 19,044 — — 347 — 20,292 Definite weakness - loss unlikely — — 1,887 — — — 346 — 2,233 Partial loss probable — — — — — — — — — Definite loss — — — — — — — — — Total commercial construction $ 43,369 $ 222,327 $ 116,795 $ 92,537 $ — $ 6,867 $ 44,918 $ 325 $ 527,138 Small business Pass $ 8,414 $ 31,651 $ 25,184 $ 17,848 $ 17,594 $ 26,734 $ 47,109 $ — $ 174,534 Potential weakness — 12 18 13 753 259 597 — 1,652 Definite weakness - loss unlikely — 47 133 51 169 598 636 — 1,634 Partial loss probable — — — — — — — — — Definite loss — — — — — — — — — Total small business $ 8,414 $ 31,710 $ 25,335 $ 17,912 $ 18,516 $ 27,591 $ 48,342 $ — $ 177,820 Residential real estate Pass $ 39,122 $ 204,524 $ 260,899 $ 210,662 $ 283,255 $ 523,742 $ — $ — $ 1,522,204 Default — — 427 435 — 5,350 — — 6,212 Total residential real estate $ 39,122 $ 204,524 $ 261,326 $ 211,097 $ 283,255 $ 529,092 $ — $ — $ 1,528,416 Home equity Pass $ 23,397 $ 75,161 $ 70,081 $ 67,740 $ 51,106 $ 138,733 $ 715,169 $ 1,853 $ 1,143,240 Default — — — 18 — 579 2,372 61 3,030 Total home equity $ 23,397 $ 75,161 $ 70,081 $ 67,758 $ 51,106 $ 139,312 $ 717,541 $ 1,914 $ 1,146,270 Other consumer Pass $ 414 $ 705 $ 356 $ 1,049 $ 1,000 $ 10,850 $ 12,767 $ — $ 27,141 Default — — — 19 — 39 16 — 74 Total other consumer $ 414 $ 705 $ 356 $ 1,068 $ 1,000 $ 10,889 $ 12,783 $ — $ 27,215 Total $ 497,485 $ 1,711,032 $ 1,267,076 $ 1,131,429 $ 879,559 $ 1,749,590 $ 1,674,656 $ 5,603 $ 8,916,430 The following tables detail the amount of outstanding principal balances relative to each of the risk-rating categories for the Company’s loan portfolio as of December 31, 2019: December 31, 2019 Category Risk Rating Commercial and Industrial Commercial Real Estate Commercial Construction Small Business Total (Dollars in thousands) Pass 1 - 6 $ 1,274,155 $ 3,860,555 $ 542,608 $ 171,213 $ 5,848,531 Potential weakness 7 63,485 97,268 2,247 1,416 164,416 Definite weakness-loss unlikely 8 57,396 44,536 2,438 1,868 106,238 Partial loss probable 9 — — — — — Definite loss 10 — — — — — Total $ 1,395,036 $ 4,002,359 $ 547,293 $ 174,497 $ 6,119,185
Weighted average FICO scores and the weighted average combined LTV ratio	The following table shows the weighted average FICO scores and the weighted average combined LTV ratios as of the periods indicated below: March 31 December 31 Residential portfolio FICO score (re-scored)(1) 749 749 LTV (re-valued)(2) 58.1 % 59.0 % Home equity portfolio FICO score (re-scored)(1) 768 767 LTV (re-valued)(2)(3) 46.9 % 46.6 % (1) The average FICO scores at March 31, 2020 are based upon rescores available from February 2020 and origination score data for loans booked in March 2020. The average FICO scores at December 31, 2019 were based upon rescores available from November 2019 and origination score data for loans booked in December 2019. (2) The combined LTV ratios for March 31, 2020 are based upon updated automated valuations as of March 2020, when available, and/or the most current valuation data available. The combined LTV ratios for December 31, 2019 were based upon updated automated valuations as of November 2019, 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.
Summary of nonaccrual loans	The following table shows information regarding nonaccrual loans as of the dates indicated: Nonaccrual Balances March 31, 2020 December 31, 2019 With Allowance for Credit Losses Without Allowance for Credit Losses Total Total (Dollars in thousands) Commercial and industrial $ 1,078 $ 20,357 $ 21,435 $ 22,574 Commercial real estate 1,305 3,644 4,949 3,016 Commercial construction — — — — Small business 450 — 450 311 Residential real estate 11,001 3,501 14,502 13,360 Home equity 6,463 108 6,571 6,570 Other consumer 108 — 108 61 Total nonaccrual loans $ 20,405 $ 27,610 $ 48,015 (1) $ 45,892 (1) (1) Included in these amounts were $23.8 million and $24.8 million of nonaccruing TDRs at March 31, 2020 and December 31, 2019
Foreclosed Residential Real Estate Property [Table Text Block]	The following table shows information regarding foreclosed residential real estate property at the dates indicated: March 31, 2020 December 31, 2019 (Dollars in thousands) Foreclosed residential real estate property held by the creditor $ — $ — Recorded investment in mortgage loans collateralized by residential real estate property that are in the process of foreclosure $ 4,580 $ 3,294
Age analysis of past due financing receivables	The following tables show the age analysis of past due financing receivables as of the dates indicated: March 31, 2020 30-59 days 60-89 days 90 days or more Total Past Due Total Financing Receivables Amortized Cost >90 Days and Accruing Number of Loans Principal Balance Number of Loans Principal Balance Number of Loans Principal Balance Number of Loans Principal Balance Current (Dollars in thousands) Loan Portfolio Commercial and industrial 13 $ 1,930 — $ — 6 $ 1,078 19 $ 3,008 $ 1,445,216 $ 1,448,224 $ — Commercial real estate 18 6,989 2 383 7 1,499 27 8,871 4,052,476 4,061,347 — Commercial construction 1 331 — — — — 1 331 526,807 527,138 — Small business 12 1,030 8 185 5 176 25 1,391 176,429 177,820 — Residential real estate 19 2,614 5 994 39 6,258 63 9,866 1,518,550 1,528,416 — Home equity 22 1,507 7 801 36 3,030 65 5,338 1,140,932 1,146,270 — Other consumer (1) 335 386 11 67 16 99 362 552 26,663 27,215 25 Total 420 $ 14,787 33 $ 2,430 109 $ 12,140 562 $ 29,357 $ 8,887,073 $ 8,916,430 $ 25 December 31, 2019 30-59 days 60-89 days 90 days or more Total Past Due Total Financing Receivables Recorded Investment >90 Days and Accruing Number of Loans Principal Balance Number of Loans Principal Balance Number of Loans Principal Balance Number of Loans Principal Balance Current (Dollars in thousands) Loan Portfolio Commercial and industrial 1 $ 253 2 $ 323 5 $ 760 8 $ 1,336 $ 1,393,700 $ 1,395,036 $ — Commercial real estate 7 1,690 1 194 8 2,038 16 3,922 3,998,437 4,002,359 218 (2 ) Commercial construction 1 560 — — — — 1 560 546,733 547,293 — Small business 11 837 3 15 6 115 20 967 173,530 174,497 — Residential real estate 17 2,237 17 3,055 38 7,020 72 12,312 1,578,257 1,590,569 1,652 (2 ) Home equity 23 1,689 8 524 40 3,854 71 6,067 1,127,731 1,133,798 265 (2 ) Other consumer (1) 387 245 12 44 16 32 415 321 29,766 30,087 22 Total 447 $ 7,511 43 $ 4,155 113 $ 13,819 603 $ 25,485 $ 8,848,154 $ 8,873,639 $ 2,157 (1) Other consumer portfolio is inclusive of deposit account overdrafts recorded as loan balances. (2) Represents purchased credit impaired loans that were accruing interest due to expectations of future cash collections.
Summary 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: March 31, 2020 December 31, 2019 (Dollars in thousands) TDRs on accrual status $ 18,129 $ 19,599 TDRs on nonaccrual 23,842 24,766 Total TDRs $ 41,971 $ 44,365 Amount of specific reserves included in the allowance for loan loss associated with TDRs n/a $ 855 Additional commitments to lend to a borrower who has been a party to a TDR $ 163 $ 63
Change in investment recorded subsequent to modifications	The following table shows the modifications which occurred during the period indicated and the change in the recorded investment subsequent to the modifications occurring: Three Months Ended March 31, 2020 Number of Contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment (Dollars in thousands) Troubled debt restructurings Commercial and industrial 2 $ 268 $ 268 Commercial real estate 1 604 604 Small business 1 49 25 Residential real estate 1 177 209 Total 5 $ 1,098 $ 1,106 Three Months Ended March 31, 2019 Number of Contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment (Dollars in thousands) Troubled debt restructurings Commercial real estate 1 150 150 Home equity 1 75 75 Total 2 $ 225 $ 225
Post modification balance of Troubled Debt Restructuring	Three Months Ended March 31, 2019 Number of Contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment (Dollars in thousands) Troubled debt restructurings Commercial real estate 1 150 150 Home equity 1 75 75 Total 2 $ 225 $ 225 The following table shows the Company’s post-modification balance of TDRs listed by type of modification during the period indicated: Three Months Ended March 31 2020 2019 (Dollars in thousands) Adjusted interest rate $ 604 $ 150 Court ordered concession 25 75 Extended maturity 477 — Total $ 1,106 $ 225
Impaired loans by loan portfolio	The table below sets forth information regarding the Company’s impaired loans by loan portfolio at the date indicated: December 31, 2019 Recorded Investment Unpaid Principal Balance Related Allowance (Dollars in thousands) With no related allowance recorded Commercial and industrial $ 23,786 $ 34,970 $ — Commercial real estate 6,213 12,101 — Small business 469 484 — Residential real estate 4,976 5,123 — Home equity 3,764 3,893 — Other consumer 34 34 — Subtotal 39,242 56,605 — With an allowance recorded Commercial and industrial $ 670 $ 670 $ 126 Commercial real estate 2,124 2,124 48 Small business 68 105 8 Residential real estate 6,252 7,163 637 Home equity 1,184 1,382 156 Other consumer 88 91 5 Subtotal 10,386 11,535 980 Total $ 49,628 $ 68,140 $ 980
Interest income recognized on impaired loans	The following table sets forth information regarding interest income recognized on impaired loans, by portfolio, for the period indicated: Three Months Ended March 31, 2019 Average Recorded Investment Interest Income Recognized (Dollars in thousands) With no related allowance recorded Commercial and industrial $ 30,198 $ 35 Commercial real estate 8,873 104 Commercial construction 311 — Small business 323 2 Residential real estate 4,421 54 Home equity 4,952 55 Other consumer 53 1 Subtotal 49,131 251 With an allowance recorded Commercial and industrial $ 498 $ 3 Commercial real estate 1,682 24 Small business 181 2 Residential real estate 7,665 64 Home equity 985 12 Other consumer 138 1 Subtotal 11,149 106 Total $ 60,280 $ 357
Certain Loans Acquired In Transfer Accounted For As Debt Securities Acquired During Period	The following table displays certain information pertaining to PCI loans at the date indicated: December 31, 2019 (Dollars in thousands) Outstanding balance $ 18,358 Carrying amount $ 14,856
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Accretable Yield Movement Schedule	The following table summarizes activity in the accretable yield for the PCI loan portfolio for the period indicated: Three Months Ended March 31 2019 (Dollars in thousands) Beginning balance $ 1,191 Accretion (141 ) Other change in expected cash flows (1) 114 Reclassification from nonaccretable difference for loans which have paid off — Ending balance $ 1,164 (1) Represents changes in cash flows expected to be collected and resulting in increased interest income as a prospective yield adjustment over the remaining life of the loan(s).

Goodwill Goodwill (Tables)

Goodwill Goodwill (Tables)	3 Months Ended
	Mar. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Intangible Assets and Goodwill [Table Text Block]	The following table sets forth the carrying value of goodwill and other intangible assets, net of accumulated amortization, at the periods indicated below: March 31, 2020 December 31, 2019 (Dollars in thousands) Balances not subject to amortization Goodwill $ 506,206 $ 506,206 Balances subject to amortization Core deposit intangibles 26,485 28,016 Other intangible assets 981 1,270 Total other intangible assets 27,466 29,286 Total goodwill and other intangible assets $ 533,672 $ 535,492

Earnings Per Share (Tables)

Earnings Per Share (Tables)	3 Months Ended
	Mar. 31, 2020
Earnings Per Share [Abstract]
Summary of earnings per share	Earnings per share consisted of the following components for the periods indicated: Three Months Ended March 31 2020 2019 (Dollars in thousands, except per share data) Net income $ 26,751 $ 35,225 Weighted Average Shares Basic shares 34,184,431 28,106,184 Effect of dilutive securities 36,827 54,466 Diluted shares 34,221,258 28,160,650 Net income per share Basic EPS $ 0.78 $ 1.25 Effect of dilutive securities — — Diluted EPS $ 0.78 $ 1.25
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]	because they were anti-dilutive.

Stock Based Compensation (Table

Stock Based Compensation (Tables)	3 Months Ended
	Mar. 31, 2020
Share-based Payment Arrangement [Abstract]
Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block]	During the three months ended March 31, 2020 , the Company made the following awards of time vested restricted stock: Date Shares Granted Plan Grant Date Fair Value Per Share Vesting Period 2/27/2020 46,550 2005 Employee Stock Plan $ 70.24 Ratably over 5 years from grant date
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]	The Company did not grant any awards of options to purchase shares of common stock during the three months ended March 31, 2020 .

Derivatives and Hedging Activ_2

Derivatives and Hedging Activities (Tables)	3 Months Ended
	Mar. 31, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Details of derivative positions for interest rate swaps which qualify as hedges for accounting purposes	The following tables reflect the Company's derivative positions for the periods indicated below for interest rate derivatives which qualify as cash flow hedges for accounting purposes: March 31, 2020 Weighted Average Rate Notional Amount Average Maturity Current Pay Fixed Fair Value (1) (in thousands) (in years) (in thousands) Interest rate swaps on borrowings $ 175,000 2.20 1.28 % 0.94 % $ (1,790 ) Current Rate Paid Receive Fixed Swap Rate Interest rate swaps on loans 450,000 3.41 0.86 % 2.37 % 31,701 Current Rate Paid Receive Fixed Swap Rate Cap - Floor Interest rate collars on loans 400,000 3.41 0.81 % 2.73% - 2.20% 25,573 Total $ 1,025,000 $ 55,484 December 31, 2019 Weighted Average Rate Notional Amount Average Maturity Current Pay Fixed Fair Value (1) (in thousands) (in years) (in thousands) Interest rate swaps on borrowings $ 75,000 2.18 1.90 % 1.53 % $ 140 Current Rate Paid Receive Fixed Swap Rate Interest rate swaps on loans 450,000 3.66 1.76 % 2.37 % 12,907 Current Rate Paid Receive Fixed Swap Rate Cap - Floor Interest rate collars on loans 400,000 3.66 1.76 % 2.73% - 2.20% 9,896 Total $ 925,000 $ 22,943
Summary of customer related derivative positions, not designated as hedging	Notional Amount Maturing Number of Positions (1) Less than 1 year Less than 2 years Less than 3 years Less than 4 years Thereafter Total Fair Value (2) March 31, 2020 (Dollars in thousands) Loan level swaps Receive fixed, pay variable 313 $ 155,318 $ 76,735 $ 126,910 $ 139,600 $ 1,178,142 $ 1,676,705 $ 143,707 Pay fixed, receive variable 305 $ 158,692 $ 76,735 $ 126,910 $ 139,600 $ 1,178,142 $ 1,680,079 $ (143,726 ) Foreign exchange contracts Buys foreign currency, sells U.S. currency 47 $ 118,711 $ — $ — $ — $ — $ 118,711 $ (1,439 ) Buys U.S. currency, sells foreign currency 47 $ 118,711 $ — $ — $ — $ — $ 118,711 $ 1,499 Notional Amount Maturing Number of Positions (1) Less than 1 year Less than 2 years Less than 3 years Less than 4 years Thereafter Total Fair Value (2) December 31, 2019 (Dollars in thousands) Loan level swaps Receive fixed, pay variable 299 $ 156,690 $ 125,203 $ 85,603 $ 165,599 $ 1,044,315 $ 1,577,410 $ 48,596 Pay fixed, receive variable 290 $ 156,690 $ 125,203 $ 85,603 $ 165,599 $ 1,044,315 $ 1,577,410 $ (48,591 ) Foreign exchange contracts Buys foreign currency, sells U.S. currency 40 $ 91,434 $ — $ — $ — $ — $ 91,434 $ (81 ) Buys U.S. currency, sells foreign currency 40 $ 91,434 $ — $ — $ — $ — $ 91,434 $ 123 (1) The Company may enter into one dealer swap agreement which offsets multiple commercial borrower swap agreements.
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 and the potential effect of netting arrangements on its financial position, at the dates indicated: Asset Derivatives (1) Liability Derivatives (2) Fair Value at Fair Value at Fair Value at Fair Value at March 31 December 31 March 31 December 31 (Dollars in thousands) Derivatives designated as hedges Interest rate derivatives $ 57,274 (3) $ 23,140 (3) $ 1,790 (4) $ 197 (4) Derivatives not designated as hedges Customer Related Positions Loan level derivatives 143,763 (3) 52,374 (3) 143,782 (4) 52,369 (4) Foreign exchange contracts 2,047 1,191 1,987 1,149 Mortgage Derivatives Interest rate lock commitments 2,332 1,680 — — Forward sale loan commitments 399 — — 12 Forward sale hedge commitments — — 1,980 196 Total derivatives not designated as hedges 148,541 55,245 147,749 53,726 Total 205,815 78,385 149,539 53,923 Netting Adjustments (5) — — 13,024 — Net Derivatives on the Balance Sheet 205,815 78,385 136,515 53,923 Financial instruments (6) 57,276 24,882 57,276 24,882 Cash collateral pledged (received) — — 73,771 25,493 Net Derivative Amounts $ 148,539 $ 53,503 $ 5,468 $ 3,548
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: Three Months Ended March 31 2020 2019 (Dollars in thousands) Derivatives designated as hedges Gain in OCI on derivatives (effective portion), net of tax $ 22,984 $ 3,285 Gain reclassified from OCI into interest income or interest expense (effective portion) $ 1,586 $ 424 Loss reclassified from OCI into noninterest expense (loss on termination) $ — $ — Interest expense $ — $ — Other expense — — Total $ — $ — Derivatives not designated as hedges Changes in fair value of customer related positions Other income $ 22 $ 13 Other expense (24 ) (1 ) Changes in fair value of mortgage derivatives Mortgage banking income (expense) (721 ) 59 Total $ (723 ) $ 71

Income Taxes (Tables)

Income Taxes (Tables)	3 Months Ended
	Mar. 31, 2020
Income Tax Disclosure [Abstract]
Tax provision and applicable tax rates [Table Text Block]	The following table sets forth information regarding the Company’s tax provision and applicable tax rates for the periods indicated: Three Months Ended March 31 2020 2019 (Dollars in thousands) Combined federal and state income tax provision $ 2,148 $ 11,522 Effective income tax rate 7.43 % 24.65 %

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2020
Fair Value Disclosures [Abstract]
Assets and liabilities measured at fair value on a recurring 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 Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) March 31, 2020 (Dollars in thousands) Recurring fair value measurements Assets Trading securities $ 2,247 $ 2,247 $ — $ — Equity securities 19,439 19,439 — — Securities available for sale U.S. government agency securities 24,292 — 24,292 — Agency mortgage-backed securities 258,784 — 258,784 — Agency collateralized mortgage obligations 87,210 — 87,210 — State, county, and municipal securities 1,144 — 1,144 — Single issuer trust preferred securities issued by banks and insurers 436 — 436 — Pooled trust preferred securities issued by banks and insurers 1,009 — — 1,009 Small business administration pooled securities 64,421 — 64,421 — Loans held for sale 43,756 — 43,756 — Derivative instruments 205,815 — 205,815 — Liabilities Derivative instruments 149,539 — 149,539 — Total recurring fair value measurements $ 559,014 $ 21,686 $ 536,319 $ 1,009 Nonrecurring fair value measurements Assets Individually assessed collateral dependent loans $ 39,444 $ — $ — $ 39,444 Total nonrecurring fair value measurements $ 39,444 $ — $ — $ 39,444 Fair Value Measurements at Reporting Date Using Balance Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) December 31, 2019 (Dollars in thousands) Recurring fair value measurements Assets Trading securities $ 2,179 $ 2,179 $ — $ — Equity securities 21,261 21,261 — — Securities available for sale U.S. government agency securities 33,115 — 33,115 — Agency mortgage-backed securities 247,000 — 247,000 — Agency collateralized mortgage obligations 88,511 — 88,511 — State, county, and municipal securities 1,396 — 1,396 — Single issuer trust preferred securities issued by banks and insurers 493 — 493 — Pooled trust preferred securities issued by banks and insurers 1,114 — — 1,114 Small business administration pooled securities 54,795 — 54,795 — Loans held for sale 33,307 — 33,307 — Derivative instruments 78,385 — 78,385 — Liabilities Derivative instruments 53,923 — 53,923 — Total recurring fair value measurements $ 507,633 $ 23,440 $ 483,079 $ 1,114 Nonrecurring fair value measurements: Assets Collateral dependent impaired loans $ 25,515 $ — $ — $ 25,515 Total nonrecurring fair value measurements $ 25,515 $ — $ — $ 25,515
Reconciliation for all assets and liabilities measured at fair value on a recurring basis	The table below presents a reconciliation for all assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3), which were valued using pricing models and discounted cash flow methodologies, as of the dates indicated: Three Months Ended March 31 2020 2019 (Dollars in thousands) Pooled Trust Preferred Securities Beginning balance $ 1,114 $ 1,329 Gains and (losses) (realized/unrealized) Included in earnings — — Included in other comprehensive income (60 ) 3 Settlements (45 ) (18 ) Ending balance $ 1,009 $ 1,314
Investments in securities that are classified as level 3	The following table sets forth certain unobservable inputs regarding the Company’s financial instruments that are classified as Level 3 for the periods indicated: March 31 December 31 March 31 December 31 March 31 December 31 Valuation Technique Fair Value Unobservable Inputs Range Weighted Average (Dollars in thousands) Discounted cash flow methodology Pooled trust preferred securities $ 1,009 $ 1,114 Cumulative prepayment 0% - 57% 0% - 57% 2.4% 2.6% Cumulative default 4% - 100% 2% - 100% 13.5% 13.5% Loss given default 85% - 100% 85% - 100% 93.6% 93.6% Cure given default 0% - 75% 0% - 75% 60.9% 60.9% Appraisals of collateral(1) Individually assessed collateral dependent loans $ 39,444 n/a Collateral dependent impaired loans n/a $ 25,515 (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 estimated fair values and related carrying amounts for assets and liabilities	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) March 31, 2020 (Dollars in thousands) Financial assets Securities held to maturity(a) U.S. Treasury securities $ 4,029 $ 4,139 $ — $ 4,139 $ — Agency mortgage-backed securities 463,632 482,363 — 482,363 — Agency collateralized mortgage obligations 277,921 289,902 — 289,902 — Single issuer trust preferred securities issued by banks 1,500 1,490 — 1,490 — Small business administration pooled securities 30,716 31,461 — 31,461 — Loans, net of allowance for credit losses(b) 8,784,610 8,626,697 — — 8,626,697 Federal Home Loan Bank stock(c) 23,274 23,274 — 23,274 — Cash surrender value of life insurance policies(d) 197,772 197,772 — 197,772 — Financial liabilities Deposit liabilities, other than time deposits(e) $ 8,146,490 $ 8,146,490 $ — $ 8,146,490 $ — Time certificates of deposits(f) 1,269,708 1,279,983 — 1,279,983 — Federal Home Loan Bank borrowings(f) 358,591 359,249 — 359,249 — Long-term borrowings(f) 74,920 73,572 — 73,572 — Junior subordinated debentures(g) 62,849 61,528 — 61,528 — Subordinated debentures(f) 49,625 51,896 — — 51,896 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, 2019 (Dollars in thousands) Financial assets Securities held to maturity(a) U.S. government agency securities $ 12,874 $ 12,997 $ — $ 12,997 $ — U.S. Treasury securities 4,032 4,053 $ — 4,053 $ — Agency mortgage-backed securities 397,414 405,802 — 405,802 — Agency collateralized mortgage obligations 293,662 297,314 — 297,314 — Single issuer trust preferred securities issued by banks 1,500 1,490 — 1,490 — Small business administration pooled securities 31,324 31,607 — 31,607 — Loans, net of allowance for credit losses(b) 8,780,384 8,613,635 — — 8,613,635 Federal Home Loan Bank stock(c) 14,424 14,424 — 14,424 — Cash surrender value of life insurance policies(d) 197,372 197,372 — 197,372 — Financial liabilities Deposit liabilities, other than time deposits(e) $ 7,752,052 $ 7,752,052 $ — $ 7,752,052 $ — Time certificates of deposits(f) 1,395,315 1,396,760 — 1,396,760 — Federal Home Loan Bank borrowings(f) 115,748 115,881 — 115,881 — Long-term borrowings (f) 74,906 72,219 — 72,219 — Junior subordinated debentures(g) 62,848 65,603 — 65,603 — Subordinated debentures(f) 49,601 52,870 — — 52,870 (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 of loans is measured using the exit price valuation method, determined primarily 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, while incorporating liquidity and credit assumptions. 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.

Revenue Recognition Revenue (Ta

Revenue Recognition Revenue (Tables)	3 Months Ended
	Mar. 31, 2020
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue [Table Text Block]	The following table presents the revenue streams that the Company has disaggregated as of the periods indicated: Three Months Ended March 31 March 31 (Dollars in thousands) Deposit account fees (inclusive of cash management fees) $ 4,970 $ 4,406 Interchange fees 4,104 3,735 ATM fees 639 666 Investment management - wealth management and advisory services 6,289 6,069 Investment management - retail investments and insurance revenue 540 679 Merchant processing income 393 280 Credit card income 183 — Other noninterest income 1,212 939 Total noninterest income in-scope of ASC 606 18,330 16,774 Total noninterest income out-of-scope of ASC 606 8,105 4,759 Total noninterest income $ 26,435 $ 21,533
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: March 31, 2020 December 31, 2019 (Dollars in thousands) Receivables, included in other assets $ 1,912 $ 2,341

Comprehensive Income_Loss (Tabl

Comprehensive Income/Loss (Tables)	3 Months Ended
	Mar. 31, 2020
Equity [Abstract]
Comprehensive income	The following tables present 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): Three Months Ended Pre Tax Tax (Expense) After Tax (Dollars in thousands) Change in fair value of securities available for sale $ 12,123 $ (2,776 ) $ 9,347 Less: net security losses reclassified into other noninterest expense — — — Net change in fair value of securities available for sale 12,123 (2,776 ) 9,347 Change in fair value of cash flow hedges 33,567 (9,443 ) 24,124 Less: net cash flow hedge gains reclassified into interest income or interest expense 1,586 (446 ) 1,140 Net change in fair value of cash flow hedges 31,981 (8,997 ) 22,984 Net unamortized loss related to defined benefit pension and other postretirement adjustments arising during the period (1,389 ) 391 (998 ) Amortization of net actuarial losses 245 (69 ) 176 Amortization of net prior service costs 69 (19 ) 50 Net change in other comprehensive income for defined benefit postretirement plans (1) (1,075 ) 303 (772 ) Total other comprehensive income $ 43,029 $ (11,470 ) $ 31,559 Three Months Ended Pre Tax Tax (Expense) After Tax (Dollars in thousands) Change in fair value of securities available for sale $ 6,178 $ (1,449 ) $ 4,729 Less: net security gains reclassified into other noninterest income (expense) — — — Net change in fair value of securities available for sale 6,178 (1,449 ) 4,729 Change in fair value of cash flow hedges 4,996 (1,406 ) 3,590 Less: net cash flow hedge gains reclassified into interest income or interest expense 424 (119 ) 305 Net change in fair value of cash flow hedges 4,572 (1,287 ) 3,285 Net unamortized loss related to defined benefit pension and other postretirement adjustments arising during the period (11 ) 3 (8 ) Amortization of net actuarial gains (2 ) 1 (1 ) Amortization of net prior service costs 69 (20 ) 49 Net change in other comprehensive income for defined benefit postretirement plans (1) 56 (16 ) 40 Total other comprehensive income $ 10,806 $ (2,752 ) $ 8,054 (1) The amortization of prior service costs is included in the computation of net periodic pension cost as disclosed in the Employee Benefit Plans footnote in the Company's Annual Report on Form 10-K for the year ended December 31, 2019 , filed with the Securities and Exchange Commission.
Company's accumulated other comprehensive 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 on Cash Flow Hedge Defined Benefit Postretirement Plans Accumulated Other Comprehensive Income (Loss) (Dollars in thousands) 2020 Beginning balance: January 1, 2020 $ 4,398 $ 16,479 $ (2,708 ) $ 18,169 Net change in other comprehensive income (loss) 9,347 22,984 (772 ) 31,559 Ending balance: March 31, 2020 $ 13,745 $ 39,463 $ (3,480 ) $ 49,728 2019 Beginning balance: January 1, 2019 $ (5,947 ) $ 6,148 $ (1,374 ) $ (1,173 ) Net change in other comprehensive income (loss) 4,729 3,285 40 8,054 Ending balance: March 31, 2019 $ (1,218 ) $ 9,433 $ (1,334 ) $ 6,881

Commitments and Contingencies (

Commitments and Contingencies (Tables)	3 Months Ended
	Mar. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Schedule of Fair Value, Off-balance Sheet Risks [Table Text Block]	The following table summarizes the above financial instruments at the dates indicated: March 31, 2020 December 31, 2019 (Dollars in thousands) Commitments to extend credit $ 3,296,926 $ 3,337,930 Standby letters of credit 20,100 21,565 Deferred standby letter of credit fees 166 158 Loans sold with recourse 426,342 404,532

Investments is Low Income Hou_2

Investments is Low Income Housing Tax Credits Investments in Low Income Housing Tax Credits (Tables)	3 Months Ended
	Mar. 31, 2020
Equity Method Investments and Joint Ventures [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 the dates indicated: March 31 December 31 (Dollars in thousands) Original investment value $ 110,669 $ 96,275 Current recorded investment 84,679 72,510 Unfunded liability obligation 43,427 34,967 Tax credits and benefits 11,194 (1) 7,342 Amortization of investments 9,211 (2) 5,645 Net income tax benefit 1,983 (3) 1,696 (1) This amount reflects anticipated tax credits and tax benefits for the full year ended December 31, 2020 . (2) The amortization amount reduces the tax credits and benefits anticipated for the full year ended December 31, 2020 . (3) This amount represents the net tax benefit expected to be realized for the full year ended December 31, 2020 in determining the Company's effective tax rate.

Subsequent Events Subsequent Ev

Subsequent Events Subsequent Event (Tables)	3 Months Ended
	Mar. 31, 2020
Subsequent Event [Line Items]
Schedule of Subsequent Events [Table Text Block]	The following table summarizes the loan modification requests through the date of this filing which are anticipated to be approved: Loan Modification Requests by Loan Category: # of Loans % of Total Loans (#) Balance as of March 31, 2020 % of Total Loans ($) (Dollars in thousands) Commercial and industrial 308 0.69 % $ 163,889 1.84 % Commercial real estate 557 1.27 % 967,643 10.86 % Construction 19 0.04 % 37,811 0.42 % Small Business 289 0.65 % 21,781 0.24 % Residential real estate 438 0.99 % 185,530 2.08 % Home equity 308 0.69 % 44,695 0.50 % Other consumer 22 0.05 % 559 0.01 % Total 1,941 4.38 % $ 1,421,908 15.95 %

Recent Accounting Standards Tex

Recent Accounting Standards Textual (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020USD ($)
Receivables [Abstract]
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase	$ 1,157

Securities Securities (Equity g

Securities Securities (Equity gains and losses) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Equity securities gains and losses [Abstract]
Equity Securities, FV-NI, Gain (Loss)	$ (1,801)	$ 907
Equity Securities, FV-NI, Realized Gain (Loss)	6	3
Equity Securities, FV-NI, Unrealized Gain (Loss)	$ (1,807)	$ 904

Securities (Reconciliation of f

Securities (Reconciliation of fair value of available for sale securities) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Reconciliation of fair value of securities
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	$ 18,332	$ 6,118
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(488)	(397)
Debt Securities, Available-for-sale	437,296	426,424
Debt Securities, Available-for-sale, Amortized Cost	419,452	420,703
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	31,700	13,428
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(143)	(971)
Held to Maturity, Fair Value, Total	809,355	753,263
Amortized Cost	1,197,250
U.S. government agency securities
Reconciliation of fair value of securities
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	1,818	642
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0	0
Debt Securities, Available-for-sale, Allowance for Credit Loss	0
Debt Securities, Available-for-sale	24,292	33,115
Debt Securities, Available-for-sale, Amortized Cost	22,474	32,473
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain		123
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0	0
Held to Maturity, Fair Value, Total	0	12,997
U.S. Treasury securities
Reconciliation of fair value of securities
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	110	21
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0	0
Held to Maturity, Fair Value, Total	4,139	4,053
Agency mortgage-backed securities
Reconciliation of fair value of securities
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	11,110	3,456
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(1)	(4)
Debt Securities, Available-for-sale, Allowance for Credit Loss	0
Debt Securities, Available-for-sale	258,784	247,000
Debt Securities, Available-for-sale, Amortized Cost	247,675	243,548
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	18,864	8,445
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(133)	(57)
Held to Maturity, Fair Value, Total	482,363	405,802
Agency Collateralized Mortgage Obligations [Member]
Reconciliation of fair value of securities
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	4,027	1,225
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0	(19)
Debt Securities, Available-for-sale, Allowance for Credit Loss	0
Debt Securities, Available-for-sale	87,210	88,511
Debt Securities, Available-for-sale, Amortized Cost	83,183	87,305
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	11,981	4,501
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0	(849)
Held to Maturity, Fair Value, Total	289,902	297,314
US States and Political Subdivisions Debt Securities [Member]
Reconciliation of fair value of securities
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	18	19
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0	0
Debt Securities, Available-for-sale, Allowance for Credit Loss	0
Debt Securities, Available-for-sale	1,144	1,396
Debt Securities, Available-for-sale, Amortized Cost	1,126	1,377
Single Issuer Trust Preferred Securities Issued by Banks and Insurers [Member]
Reconciliation of fair value of securities
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax		5
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(53)	0
Debt Securities, Available-for-sale, Allowance for Credit Loss	0
Debt Securities, Available-for-sale	436	493
Debt Securities, Available-for-sale, Amortized Cost	489	488
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	0	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(10)	(10)
Held to Maturity, Fair Value, Total	1,490	1,490
Pooled trust preferred securities issued by banks and insurers
Reconciliation of fair value of 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	(434)	(374)
Debt Securities, Available-for-sale, Allowance for Credit Loss	0
Debt Securities, Available-for-sale	1,009	1,114
Debt Securities, Available-for-sale, Amortized Cost	1,443	1,488
Small Business Administration Pooled Securities [Member]
Reconciliation of fair value of securities
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	1,359	771
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0	0
Debt Securities, Available-for-sale, Allowance for Credit Loss	0
Debt Securities, Available-for-sale	64,421	54,795
Debt Securities, Available-for-sale, Amortized Cost	63,062	54,024
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	745	338
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0	(55)
Held to Maturity, Fair Value, Total	$ 31,461	$ 31,607

Securities Securities (Availabl

Securities Securities (Available for sale securities in continuous unrealized loss position) (Details) $ in Thousands	Mar. 31, 2020USD ($)holding
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | holding	3
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 522
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(54)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	1,009
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	434
Debt Securities, Available-for-sale, Unrealized Loss Position	1,531
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 488
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | holding	1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 86
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(1)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0
Debt Securities, Available-for-sale, Unrealized Loss Position	86
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 1
Single issuer trust preferred securities issued by banks and insurers
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | holding	1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 436
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(53)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0
Debt Securities, Available-for-sale, Unrealized Loss Position	436
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 53
Pooled trust preferred securities issued by banks and insurers
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | holding	1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	1,009
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	434
Debt Securities, Available-for-sale, Unrealized Loss Position	1,009
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 434

Securities Securities (Reconcil

Securities Securities (Reconciliation of amortized cost of held to maturity securities) (Details) $ in Thousands	Mar. 31, 2020USD ($)	Dec. 31, 2019USD ($)holding
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	$ 777,798	$ 740,806
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	31,700	13,428
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(143)	(971)
Debt Securities, Held-to-maturity, Allowance for Credit Loss	0
Debt Securities, Held-to-maturity, Fair Value	809,355	753,263
Small Business Administration Pooled Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Available for Sale and Held to Maturity Securities Continuous Unrealized Loss Position Fair Value		7,349
Available for Sale and Held to Maturity Securities Continuous Unrealized Loss Position Aggregate Loss		55
Debt Securities, Held-to-maturity	30,716	31,324
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	745	338
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0	(55)
Debt Securities, Held-to-maturity, Allowance for Credit Loss	0
Debt Securities, Held-to-maturity, Fair Value	31,461	$ 31,607
Available for Sale and Held to Maturity Securities in Unrealized Loss Positions Qualitative Disclosure Number of Positions | holding		1
Available for Sale and Held to Maturity Securities Continuous Unrealized Loss Position Less than Twelve Months Fair Value		$ 7,349
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for less than 12 months		(55)
Available for Sale and Held to Maturity Securities Continuous Unrealized Loss Position Twelve Months or Longer Fair Value		0
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for more than 12 months		0
Trust Preferred Securities Subject to Mandatory Redemption [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	1,500	1,500
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	0	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(10)	(10)
Debt Securities, Held-to-maturity, Allowance for Credit Loss	0
Debt Securities, Held-to-maturity, Fair Value	1,490	1,490
Collateralized Debt Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Available for Sale and Held to Maturity Securities Continuous Unrealized Loss Position Fair Value		85,858
Available for Sale and Held to Maturity Securities Continuous Unrealized Loss Position Aggregate Loss		868
Debt Securities, Held-to-maturity	277,921	293,662
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	11,981	4,501
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0	(849)
Debt Securities, Held-to-maturity, Allowance for Credit Loss	0
Debt Securities, Held-to-maturity, Fair Value	289,902	$ 297,314
Available for Sale and Held to Maturity Securities in Unrealized Loss Positions Qualitative Disclosure Number of Positions | holding		17
Available for Sale and Held to Maturity Securities Continuous Unrealized Loss Position Less than Twelve Months Fair Value		$ 48,476
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for less than 12 months		(215)
Available for Sale and Held to Maturity Securities Continuous Unrealized Loss Position Twelve Months or Longer Fair Value		37,382
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for more than 12 months		653
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Schedule of Held-to-maturity Securities [Line Items]
Available for Sale and Held to Maturity Securities Continuous Unrealized Loss Position Fair Value		34,252
Available for Sale and Held to Maturity Securities Continuous Unrealized Loss Position Aggregate Loss		61
Debt Securities, Held-to-maturity	463,632	397,414
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	18,864	8,445
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(133)	(57)
Debt Securities, Held-to-maturity, Allowance for Credit Loss	0
Debt Securities, Held-to-maturity, Fair Value	482,363	$ 405,802
Available for Sale and Held to Maturity Securities in Unrealized Loss Positions Qualitative Disclosure Number of Positions | holding		12
Available for Sale and Held to Maturity Securities Continuous Unrealized Loss Position Less than Twelve Months Fair Value		$ 34,009
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for less than 12 months		(59)
Available for Sale and Held to Maturity Securities Continuous Unrealized Loss Position Twelve Months or Longer Fair Value		243
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for more than 12 months		2
US Treasury Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	4,029	4,032
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	110	21
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0	0
Debt Securities, Held-to-maturity, Allowance for Credit Loss	0
Debt Securities, Held-to-maturity, Fair Value	4,139	4,053
U.S. government agency securities
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	0	12,874
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain		123
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0	0
Debt Securities, Held-to-maturity, Allowance for Credit Loss	0
Debt Securities, Held-to-maturity, Fair Value	$ 0	12,997
Equity Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Available for Sale and Held to Maturity Securities Continuous Unrealized Loss Position Fair Value		130,063
Available for Sale and Held to Maturity Securities Continuous Unrealized Loss Position Aggregate Loss		$ 1,368
Available for Sale and Held to Maturity Securities in Unrealized Loss Positions Qualitative Disclosure Number of Positions | holding		32
Available for Sale and Held to Maturity Securities Continuous Unrealized Loss Position Less than Twelve Months Fair Value		$ 89,834
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for less than 12 months		(329)
Available for Sale and Held to Maturity Securities Continuous Unrealized Loss Position Twelve Months or Longer Fair Value		40,229
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for more than 12 months		$ 1,039

Securities (Schedule of Contrac

Securities (Schedule of Contractual Maturities of Securities) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Available for Sale, Fair Value
Debt Securities, Available-for-sale, Amortized Cost	$ 419,452	$ 420,703
Debt Securities, Available-for-sale	437,296	426,424
Held to Maturity, Fair Value
Debt Securities, Held-to-maturity	777,798	740,806
Held to Maturity, Fair Value, Total	809,355	753,263
Available for Sale Securities and Held to Maturity Securities Amortized Cost	1,197,250
Debt Securities, Available-for-sale and Held-to-maturity	1,246,651
Debt Securities, Available-for-sale and Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost	8,869
Debt Securities, Available-for-sale and Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value	8,965
Debt Securities, Available-for-sale and Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost	88,712
Debt Securities, Available-for-sale and Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value	92,400
Debt Securities, Available-for-sale and Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost	104,169
Debt Securities, Available-for-sale and Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value	110,586
Debt Securities, Available-for-sale and Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Ten Years, Amortized Cost	995,500
Debt Securities, Available-for-sale and Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Ten Years, Fair Value	1,034,700
U.S. government agency securities
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Available for Sale, Amortized Cost, Due in one year or less	0
Available for Sale, Amortized Cost, Due after one year to five years	10,002
Available for Sale, Amortized Cost, Due after five to ten years	12,472
Available for Sale, Amortized Cost, Due after ten years	0
Available for Sale, Fair Value
Available for Sale, Fair Value, Due in one year or less	0
Available for Sale, Fair Value, Due after one year to five years	10,351
Available for Sale, Fair Value, Due after five to ten years	13,941
Available for Sale, Fair Value, Due after ten years	0
Debt Securities, Available-for-sale, Amortized Cost	22,474	32,473
Debt Securities, Available-for-sale	24,292	33,115
Held to Maturity, Fair Value
Debt Securities, Held-to-maturity	0	12,874
Held to Maturity, Fair Value, Total	0	12,997
Small Business Administration Pooled Securities [Member]
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Available for Sale, Amortized Cost, Due in one year or less	0
Available for Sale, Amortized Cost, Due after one year to five years	0
Available for Sale, Amortized Cost, Due after five to ten years	0
Available for Sale, Amortized Cost, Due after ten years	63,062
Available for Sale, Fair Value
Available for Sale, Fair Value, Due in one year or less	0
Available for Sale, Fair Value, Due after one year to five years	0
Available for Sale, Fair Value, Due after five to ten years	0
Available for Sale, Fair Value, Due after ten years	64,421
Debt Securities, Available-for-sale, Amortized Cost	63,062	54,024
Debt Securities, Available-for-sale	64,421	54,795
Held to Maturity, Amortized Cost
Held to Maturity, Amortized Cost, Due in one year or less	0
Held to Maturity, Amortized Cost, Due after one year to five years	0
Held to Maturity, Amortized Cost, Due after five to ten years	0
Held to Maturity, Amortized Cost, Due after ten years	30,716
Held to Maturity, Fair Value
Held to Maturity, Fair Value, Due in one year or less	0
Held to Maturity, Fair Value, Due after one year to five years	0
Held to Maturity, Fair Value, Due after five to ten years	0
Held to Maturity, Fair Value, Due after ten years	31,461
Debt Securities, Held-to-maturity	30,716	31,324
Held to Maturity, Fair Value, Total	31,461	31,607
Debt Securities [Member]
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Available for Sale, Amortized Cost, Due in one year or less	250
Available for Sale, Amortized Cost, Due after one year to five years	82,781
Available for Sale, Amortized Cost, Due after five to ten years	54,546
Available for Sale, Amortized Cost, Due after ten years	281,875
Available for Sale, Fair Value
Available for Sale, Fair Value, Due in one year or less	250
Available for Sale, Fair Value, Due after one year to five years	86,310
Available for Sale, Fair Value, Due after five to ten years	58,751
Available for Sale, Fair Value, Due after ten years	291,985
Held to Maturity, Amortized Cost
Held to Maturity, Amortized Cost, Due in one year or less	8,619
Held to Maturity, Amortized Cost, Due after one year to five years	5,931
Held to Maturity, Amortized Cost, Due after five to ten years	49,623
Held to Maturity, Amortized Cost, Due after ten years	713,625
Held to Maturity, Fair Value
Held to Maturity, Fair Value, Due in one year or less	8,715
Held to Maturity, Fair Value, Due after one year to five years	6,090
Held to Maturity, Fair Value, Due after five to ten years	51,835
Held to Maturity, Fair Value, Due after ten years	742,715
Held to Maturity, Fair Value, Total	809,355
Pooled trust preferred securities issued by banks and insurers
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Available for Sale, Amortized Cost, Due in one year or less	0
Available for Sale, Amortized Cost, Due after one year to five years	0
Available for Sale, Amortized Cost, Due after five to ten years	0
Available for Sale, Amortized Cost, Due after ten years	1,443
Available for Sale, Fair Value
Available for Sale, Fair Value, Due in one year or less	0
Available for Sale, Fair Value, Due after one year to five years	0
Available for Sale, Fair Value, Due after five to ten years	0
Available for Sale, Fair Value, Due after ten years	1,009
Debt Securities, Available-for-sale, Amortized Cost	1,443	1,488
Debt Securities, Available-for-sale	1,009	1,114
Single Issuer Trust Preferred Securities Issued by Banks and Insurers [Member]
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Available for Sale, Amortized Cost, Due in one year or less	0
Available for Sale, Amortized Cost, Due after one year to five years	0
Available for Sale, Amortized Cost, Due after five to ten years	0
Available for Sale, Amortized Cost, Due after ten years	489
Available for Sale, Fair Value
Available for Sale, Fair Value, Due in one year or less	0
Available for Sale, Fair Value, Due after one year to five years	0
Available for Sale, Fair Value, Due after five to ten years	0
Available for Sale, Fair Value, Due after ten years	436
Debt Securities, Available-for-sale, Amortized Cost	489	488
Debt Securities, Available-for-sale	436	493
Held to Maturity, Amortized Cost
Held to Maturity, Amortized Cost, Due in one year or less	0
Held to Maturity, Amortized Cost, Due after one year to five years	0
Held to Maturity, Amortized Cost, Due after five to ten years	1,500
Held to Maturity, Amortized Cost, Due after ten years	0
Held to Maturity, Fair Value
Held to Maturity, Fair Value, Due in one year or less	0
Held to Maturity, Fair Value, Due after one year to five years	0
Held to Maturity, Fair Value, Due after five to ten years	1,490
Held to Maturity, Fair Value, Due after ten years	0
Debt Securities, Held-to-maturity	1,500	1,500
Held to Maturity, Fair Value, Total	1,490	1,490
US States and Political Subdivisions Debt Securities [Member]
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Available for Sale, Amortized Cost, Due in one year or less	250
Available for Sale, Amortized Cost, Due after one year to five years	687
Available for Sale, Amortized Cost, Due after five to ten years	189
Available for Sale, Amortized Cost, Due after ten years	0
Available for Sale, Fair Value
Available for Sale, Fair Value, Due in one year or less	250
Available for Sale, Fair Value, Due after one year to five years	691
Available for Sale, Fair Value, Due after five to ten years	203
Available for Sale, Fair Value, Due after ten years	0
Debt Securities, Available-for-sale, Amortized Cost	1,126	1,377
Debt Securities, Available-for-sale	1,144	1,396
Agency Collateralized Mortgage Obligations [Member]
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Available for Sale, Amortized Cost, Due in one year or less	0
Available for Sale, Amortized Cost, Due after one year to five years	0
Available for Sale, Amortized Cost, Due after five to ten years	0
Available for Sale, Amortized Cost, Due after ten years	83,183
Available for Sale, Fair Value
Available for Sale, Fair Value, Due in one year or less	0
Available for Sale, Fair Value, Due after one year to five years	0
Available for Sale, Fair Value, Due after five to ten years	0
Available for Sale, Fair Value, Due after ten years	87,210
Debt Securities, Available-for-sale, Amortized Cost	83,183	87,305
Debt Securities, Available-for-sale	87,210	88,511
Held to Maturity, Amortized Cost
Held to Maturity, Amortized Cost, Due in one year or less	0
Held to Maturity, Amortized Cost, Due after one year to five years	0
Held to Maturity, Amortized Cost, Due after five to ten years	0
Held to Maturity, Amortized Cost, Due after ten years	277,921
Held to Maturity, Fair Value
Held to Maturity, Fair Value, Due in one year or less	0
Held to Maturity, Fair Value, Due after one year to five years	0
Held to Maturity, Fair Value, Due after five to ten years	0
Held to Maturity, Fair Value, Due after ten years	289,902
Debt Securities, Held-to-maturity	277,921	293,662
Held to Maturity, Fair Value, Total	289,902	297,314
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Available for Sale, Amortized Cost, Due in one year or less	0
Available for Sale, Amortized Cost, Due after one year to five years	72,092
Available for Sale, Amortized Cost, Due after five to ten years	41,885
Available for Sale, Amortized Cost, Due after ten years	133,698
Available for Sale, Fair Value
Available for Sale, Fair Value, Due in one year or less	0
Available for Sale, Fair Value, Due after one year to five years	75,268
Available for Sale, Fair Value, Due after five to ten years	44,607
Available for Sale, Fair Value, Due after ten years	138,909
Debt Securities, Available-for-sale, Amortized Cost	247,675	243,548
Debt Securities, Available-for-sale	258,784	247,000
Held to Maturity, Amortized Cost
Held to Maturity, Amortized Cost, Due in one year or less	8,619
Held to Maturity, Amortized Cost, Due after one year to five years	1,902
Held to Maturity, Amortized Cost, Due after five to ten years	48,123
Held to Maturity, Amortized Cost, Due after ten years	404,988
Held to Maturity, Fair Value
Held to Maturity, Fair Value, Due in one year or less	8,715
Held to Maturity, Fair Value, Due after one year to five years	1,951
Held to Maturity, Fair Value, Due after five to ten years	50,345
Held to Maturity, Fair Value, Due after ten years	421,352
Debt Securities, Held-to-maturity	463,632	397,414
Held to Maturity, Fair Value, Total	482,363	405,802
US Treasury Securities [Member]
Held to Maturity, Amortized Cost
Held to Maturity, Amortized Cost, Due in one year or less	0
Held to Maturity, Amortized Cost, Due after one year to five years	4,029
Held to Maturity, Amortized Cost, Due after five to ten years	0
Held to Maturity, Amortized Cost, Due after ten years	0
Held to Maturity, Fair Value
Held to Maturity, Fair Value, Due in one year or less	0
Held to Maturity, Fair Value, Due after one year to five years	4,139
Held to Maturity, Fair Value, Due after five to ten years	0
Held to Maturity, Fair Value, Due after ten years	0
Debt Securities, Held-to-maturity	4,029	4,032
Held to Maturity, Fair Value, Total	$ 4,139	$ 4,053

Securities (Unrealized Loss NOT

Securities (Unrealized Loss NOT deemed to be OTTI) (Details) $ in Thousands	Mar. 31, 2020USD ($)holding	Dec. 31, 2019USD ($)holding
Gain (Loss) on Securities [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 1,531
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	1,009
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(434)
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ (488)
Summary of gross unrealized losses and fair value of investments
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | holding	3
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 522
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(54)
Agency mortgage-backed securities
Gain (Loss) on Securities [Line Items]
Available for Sale and Held to Maturity Securities in Unrealized Loss Positions Qualitative Disclosure Number of Positions | holding		12
Debt Securities, Available-for-sale, Unrealized Loss Position	86
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ (1)
Summary of gross unrealized losses and fair value of investments
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | holding	1
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 86
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(1)
Available for Sale and Held to Maturity Securities Continuous Unrealized Loss Position Less than Twelve Months Fair Value		$ 34,009
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for less than 12 months		(59)
Available for Sale and Held to Maturity Securities Continuous Unrealized Loss Position Twelve Months or Longer Fair Value		243
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for more than 12 months		(2)
Available for Sale and Held to Maturity Securities Continuous Unrealized Loss Position Fair Value		34,252
Available for Sale and Held to Maturity Securities Continuous Unrealized Loss Position Aggregate Loss		$ (61)
Agency Collateralized Mortgage Obligations [Member]
Gain (Loss) on Securities [Line Items]
Available for Sale and Held to Maturity Securities in Unrealized Loss Positions Qualitative Disclosure Number of Positions | holding		17
Summary of gross unrealized losses and fair value of investments
Available for Sale and Held to Maturity Securities Continuous Unrealized Loss Position Less than Twelve Months Fair Value		$ 48,476
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for less than 12 months		(215)
Available for Sale and Held to Maturity Securities Continuous Unrealized Loss Position Twelve Months or Longer Fair Value		37,382
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for more than 12 months		(653)
Available for Sale and Held to Maturity Securities Continuous Unrealized Loss Position Fair Value		85,858
Available for Sale and Held to Maturity Securities Continuous Unrealized Loss Position Aggregate Loss		$ (868)
Single issuer trust preferred securities issued by banks and insurers
Gain (Loss) on Securities [Line Items]
Available for Sale and Held to Maturity Securities in Unrealized Loss Positions Qualitative Disclosure Number of Positions | holding		1
Debt Securities, Available-for-sale, Unrealized Loss Position	436
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ (53)
Summary of gross unrealized losses and fair value of investments
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | holding	1
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 436
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(53)
Available for Sale and Held to Maturity Securities Continuous Unrealized Loss Position Less than Twelve Months Fair Value		$ 0
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for less than 12 months		0
Available for Sale and Held to Maturity Securities Continuous Unrealized Loss Position Twelve Months or Longer Fair Value		1,490
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for more than 12 months		(10)
Available for Sale and Held to Maturity Securities Continuous Unrealized Loss Position Fair Value		1,490
Available for Sale and Held to Maturity Securities Continuous Unrealized Loss Position Aggregate Loss		$ (10)
Pooled trust preferred securities issued by banks and insurers
Gain (Loss) on Securities [Line Items]
Available for Sale and Held to Maturity Securities in Unrealized Loss Positions Qualitative Disclosure Number of Positions | holding		1
Debt Securities, Available-for-sale, Unrealized Loss Position	1,009
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	1,009
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(434)
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ (434)
Summary of gross unrealized losses and fair value of investments
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | holding	1
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 0
Available for Sale and Held to Maturity Securities Continuous Unrealized Loss Position Less than Twelve Months Fair Value		$ 0
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for less than 12 months		0
Available for Sale and Held to Maturity Securities Continuous Unrealized Loss Position Twelve Months or Longer Fair Value		1,114
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for more than 12 months		(374)
Available for Sale and Held to Maturity Securities Continuous Unrealized Loss Position Fair Value		1,114
Available for Sale and Held to Maturity Securities Continuous Unrealized Loss Position Aggregate Loss		$ (374)
Small Business Administration Pooled Securities [Member]
Gain (Loss) on Securities [Line Items]
Available for Sale and Held to Maturity Securities in Unrealized Loss Positions Qualitative Disclosure Number of Positions | holding		1
Summary of gross unrealized losses and fair value of investments
Available for Sale and Held to Maturity Securities Continuous Unrealized Loss Position Less than Twelve Months Fair Value		$ 7,349
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for less than 12 months		(55)
Available for Sale and Held to Maturity Securities Continuous Unrealized Loss Position Twelve Months or Longer Fair Value		0
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for more than 12 months		0
Available for Sale and Held to Maturity Securities Continuous Unrealized Loss Position Fair Value		7,349
Available for Sale and Held to Maturity Securities Continuous Unrealized Loss Position Aggregate Loss		$ (55)
Equity Securities [Member]
Gain (Loss) on Securities [Line Items]
Available for Sale and Held to Maturity Securities in Unrealized Loss Positions Qualitative Disclosure Number of Positions | holding		32
Summary of gross unrealized losses and fair value of investments
Available for Sale and Held to Maturity Securities Continuous Unrealized Loss Position Less than Twelve Months Fair Value		$ 89,834
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for less than 12 months		(329)
Available for Sale and Held to Maturity Securities Continuous Unrealized Loss Position Twelve Months or Longer Fair Value		40,229
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for more than 12 months		(1,039)
Available for Sale and Held to Maturity Securities Continuous Unrealized Loss Position Fair Value		130,063
Available for Sale and Held to Maturity Securities Continuous Unrealized Loss Position Aggregate Loss		$ (1,368)

Securities (Details Textual) (D

Securities (Details Textual) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Interest Receivable		$ 25,900
Trading		2,247	$ 2,179
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Period Increase (Decrease)	$ 0
Debt Securities, Available-for-sale		437,296	426,424
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held			0
Securities (Textual) [Abstract]
Callable Securities in Investment Portfolio		4,100
Pledged Financial Instruments, Not Separately Reported, Securities		459,500	375,500
Investments in obligations of individual states, counties or municipalities which exceed 10% of equity		0	0
Equity Securities, FV-NI		19,439	$ 21,261
Available-for-sale Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Interest Receivable		1,600
Held-to-maturity Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Interest Receivable		$ 2,000

Loans, Allowance for Credit L_3

Loans, Allowance for Credit Losses and Credit Quality Financing Receivable, Allowance for Credit Loss (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss	$ 92,376	$ 67,740
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method	(1,137)
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase	1,157
Allowance for Loan and Lease Losses, Write-offs	(734)
Allowance for Loan and Lease Loss, Recovery of Bad Debts	350
Provision for Loan and Lease Losses	25,000
Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss	21,649	17,594
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method	(1,984)
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase	49
Allowance for Loan and Lease Losses, Write-offs	0
Allowance for Loan and Lease Loss, Recovery of Bad Debts	42
Provision for Loan and Lease Losses	5,948
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss	29,498	32,935
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method	(13,048)
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase	337
Allowance for Loan and Lease Losses, Write-offs	0
Allowance for Loan and Lease Loss, Recovery of Bad Debts	0
Provision for Loan and Lease Losses	9,274
Construction Loans [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss	3,747	6,053
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method	(3,652)
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase	0
Allowance for Loan and Lease Losses, Write-offs	0
Allowance for Loan and Lease Loss, Recovery of Bad Debts	0
Provision for Loan and Lease Losses	1,346
Small Business [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss	3,829	1,746
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method	495
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase	0
Allowance for Loan and Lease Losses, Write-offs	(109)
Allowance for Loan and Lease Loss, Recovery of Bad Debts	3
Provision for Loan and Lease Losses	1,694
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss	14,847	3,440
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method	9,828
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase	423
Allowance for Loan and Lease Losses, Write-offs	0
Allowance for Loan and Lease Loss, Recovery of Bad Debts	1
Provision for Loan and Lease Losses	1,155
Home Equity Line of Credit [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss	17,910	5,576
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method	7,012
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase	319
Allowance for Loan and Lease Losses, Write-offs	(138)
Allowance for Loan and Lease Loss, Recovery of Bad Debts	58
Provision for Loan and Lease Losses	5,083
Consumer - Other [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss	896	$ 396
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method	212
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase	29
Allowance for Loan and Lease Losses, Write-offs	(487)
Allowance for Loan and Lease Loss, Recovery of Bad Debts	246
Provision for Loan and Lease Losses	$ 500

Loans, Allowance for Credit L_4

Loans, Allowance for Credit Losses and Credit Quality Finance Receivable Credit Quality Indicators (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	$ 1,711,032
Financing Receivable, Originated Two Years before Latest Fiscal Year	1,267,076
Financing Receivable, Originated Three Years before Latest Fiscal Year	1,131,429
Financing Receivable, Originated Four Years before Latest Fiscal Year	879,559
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1,749,590
Financing Receivable, Revolving	1,674,656
Financing Receivable, after Allowance for Credit Loss	497,485
Loans and Leases Receivable, Gross	8,916,430	$ 8,873,639
Commercial Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	955,120
Financing Receivable, Originated Two Years before Latest Fiscal Year	627,312
Financing Receivable, Originated Three Years before Latest Fiscal Year	680,236
Financing Receivable, Originated Four Years before Latest Fiscal Year	485,668
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	999,942
Financing Receivable, Revolving	48,056
Financing Receivable, after Allowance for Credit Loss	262,026
Loans and Leases Receivable, Gross	4,061,347	4,002,359
Commercial Real Estate [Member] | Potential Weakness [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	8,303
Financing Receivable, Originated Two Years before Latest Fiscal Year	33,755
Financing Receivable, Originated Three Years before Latest Fiscal Year	8,506
Financing Receivable, Originated Four Years before Latest Fiscal Year	9,851
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	42,382
Financing Receivable, Revolving	0
Financing Receivable, after Allowance for Credit Loss	1,809
Loans and Leases Receivable, Gross	104,606
Commercial Real Estate [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	943,205
Financing Receivable, Originated Two Years before Latest Fiscal Year	586,125
Financing Receivable, Originated Three Years before Latest Fiscal Year	651,335
Financing Receivable, Originated Four Years before Latest Fiscal Year	468,824
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	945,248
Financing Receivable, Revolving	48,056
Financing Receivable, after Allowance for Credit Loss	260,217
Loans and Leases Receivable, Gross	3,905,997
Commercial Real Estate [Member] | Definite Weakness Loss Unlikely [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	3,612
Financing Receivable, Originated Two Years before Latest Fiscal Year	7,432
Financing Receivable, Originated Three Years before Latest Fiscal Year	20,395
Financing Receivable, Originated Four Years before Latest Fiscal Year	6,993
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	12,312
Financing Receivable, Revolving	0
Financing Receivable, after Allowance for Credit Loss	0
Loans and Leases Receivable, Gross	50,744
Commercial Real Estate [Member] | Partial Loss Probable [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0
Financing Receivable, Revolving	0
Financing Receivable, after Allowance for Credit Loss	0
Loans and Leases Receivable, Gross	0
Commercial Real Estate [Member] | Definite Loss [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0
Financing Receivable, Revolving	0
Financing Receivable, after Allowance for Credit Loss	0
Loans and Leases Receivable, Gross	0
Commercial And Industrial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	221,485
Financing Receivable, Originated Two Years before Latest Fiscal Year	165,871
Financing Receivable, Originated Three Years before Latest Fiscal Year	60,821
Financing Receivable, Originated Four Years before Latest Fiscal Year	40,014
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	35,897
Financing Receivable, Revolving	803,016
Financing Receivable, after Allowance for Credit Loss	120,743
Loans and Leases Receivable, Gross	1,448,224	1,395,036
Commercial And Industrial [Member] | Potential Weakness [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	5,432
Financing Receivable, Originated Two Years before Latest Fiscal Year	1,489
Financing Receivable, Originated Three Years before Latest Fiscal Year	4,909
Financing Receivable, Originated Four Years before Latest Fiscal Year	725
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	697
Financing Receivable, Revolving	21,780
Financing Receivable, after Allowance for Credit Loss	362
Loans and Leases Receivable, Gross	35,444
Commercial And Industrial [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	213,925
Financing Receivable, Originated Two Years before Latest Fiscal Year	138,376
Financing Receivable, Originated Three Years before Latest Fiscal Year	50,323
Financing Receivable, Originated Four Years before Latest Fiscal Year	36,685
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	33,576
Financing Receivable, Revolving	736,304
Financing Receivable, after Allowance for Credit Loss	119,886
Loans and Leases Receivable, Gross	1,329,402
Commercial And Industrial [Member] | Definite Weakness Loss Unlikely [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	2,128
Financing Receivable, Originated Two Years before Latest Fiscal Year	26,006
Financing Receivable, Originated Three Years before Latest Fiscal Year	5,589
Financing Receivable, Originated Four Years before Latest Fiscal Year	2,604
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1,575
Financing Receivable, Revolving	44,932
Financing Receivable, after Allowance for Credit Loss	495
Loans and Leases Receivable, Gross	83,329
Commercial And Industrial [Member] | Partial Loss Probable [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	49
Financing Receivable, Revolving	0
Financing Receivable, after Allowance for Credit Loss	0
Loans and Leases Receivable, Gross	49
Commercial And Industrial [Member] | Definite Loss [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0
Financing Receivable, Revolving	0
Financing Receivable, after Allowance for Credit Loss	0
Construction Loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	222,327
Financing Receivable, Originated Two Years before Latest Fiscal Year	116,795
Financing Receivable, Originated Three Years before Latest Fiscal Year	92,537
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	6,867
Financing Receivable, Revolving	44,918
Financing Receivable, after Allowance for Credit Loss	43,369
Loans and Leases Receivable, Gross	527,138	547,293
Construction Loans [Member] | Potential Weakness [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	554
Financing Receivable, Originated Two Years before Latest Fiscal Year	347
Financing Receivable, Originated Three Years before Latest Fiscal Year	19,044
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0
Financing Receivable, Revolving	347
Financing Receivable, after Allowance for Credit Loss	0
Loans and Leases Receivable, Gross	20,292
Construction Loans [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	221,773
Financing Receivable, Originated Two Years before Latest Fiscal Year	114,561
Financing Receivable, Originated Three Years before Latest Fiscal Year	73,493
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	6,867
Financing Receivable, Revolving	44,225
Financing Receivable, after Allowance for Credit Loss	43,369
Loans and Leases Receivable, Gross	504,613
Construction Loans [Member] | Definite Weakness Loss Unlikely [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	1,887
Financing Receivable, Originated Three Years before Latest Fiscal Year	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0
Financing Receivable, Revolving	346
Financing Receivable, after Allowance for Credit Loss	0
Loans and Leases Receivable, Gross	2,233
Construction Loans [Member] | Partial Loss Probable [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0
Financing Receivable, Revolving	0
Financing Receivable, after Allowance for Credit Loss	0
Loans and Leases Receivable, Gross	0
Construction Loans [Member] | Definite Loss [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0
Financing Receivable, Revolving	0
Financing Receivable, after Allowance for Credit Loss	0
Loans and Leases Receivable, Gross	0
Small Business [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	31,710
Financing Receivable, Originated Two Years before Latest Fiscal Year	25,335
Financing Receivable, Originated Three Years before Latest Fiscal Year	17,912
Financing Receivable, Originated Four Years before Latest Fiscal Year	18,516
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	27,591
Financing Receivable, Revolving	48,342
Financing Receivable, after Allowance for Credit Loss	8,414
Loans and Leases Receivable, Gross	177,820	174,497
Small Business [Member] | Potential Weakness [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	12
Financing Receivable, Originated Two Years before Latest Fiscal Year	18
Financing Receivable, Originated Three Years before Latest Fiscal Year	13
Financing Receivable, Originated Four Years before Latest Fiscal Year	753
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	259
Financing Receivable, Revolving	597
Financing Receivable, after Allowance for Credit Loss	0
Loans and Leases Receivable, Gross	1,652
Small Business [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	31,651
Financing Receivable, Originated Two Years before Latest Fiscal Year	25,184
Financing Receivable, Originated Three Years before Latest Fiscal Year	17,848
Financing Receivable, Originated Four Years before Latest Fiscal Year	17,594
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	26,734
Financing Receivable, Revolving	47,109
Financing Receivable, after Allowance for Credit Loss	8,414
Loans and Leases Receivable, Gross	174,534
Small Business [Member] | Definite Weakness Loss Unlikely [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	47
Financing Receivable, Originated Two Years before Latest Fiscal Year	133
Financing Receivable, Originated Three Years before Latest Fiscal Year	51
Financing Receivable, Originated Four Years before Latest Fiscal Year	169
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	598
Financing Receivable, Revolving	636
Financing Receivable, after Allowance for Credit Loss	0
Loans and Leases Receivable, Gross	1,634
Small Business [Member] | Partial Loss Probable [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0
Financing Receivable, Revolving	0
Financing Receivable, after Allowance for Credit Loss	0
Loans and Leases Receivable, Gross	0
Small Business [Member] | Definite Loss [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0
Financing Receivable, Revolving	0
Financing Receivable, after Allowance for Credit Loss	0
Loans and Leases Receivable, Gross	0
Residential Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	204,524
Financing Receivable, Originated Two Years before Latest Fiscal Year	261,326
Financing Receivable, Originated Three Years before Latest Fiscal Year	211,097
Financing Receivable, Originated Four Years before Latest Fiscal Year	283,255
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	529,092
Financing Receivable, Revolving	0
Financing Receivable, after Allowance for Credit Loss	39,122
Loans and Leases Receivable, Gross	1,528,416	$ 1,590,569
Residential Real Estate [Member] | Default [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	427
Financing Receivable, Originated Three Years before Latest Fiscal Year	435
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	5,350
Financing Receivable, Revolving	0
Financing Receivable, after Allowance for Credit Loss	0
Loans and Leases Receivable, Gross	6,212
Residential Real Estate [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	204,524
Financing Receivable, Originated Two Years before Latest Fiscal Year	260,899
Financing Receivable, Originated Three Years before Latest Fiscal Year	210,662
Financing Receivable, Originated Four Years before Latest Fiscal Year	283,255
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	523,742
Financing Receivable, Revolving	0
Financing Receivable, after Allowance for Credit Loss	39,122
Loans and Leases Receivable, Gross	1,522,204
Home Equity Loan [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	75,161
Financing Receivable, Originated Two Years before Latest Fiscal Year	70,081
Financing Receivable, Originated Three Years before Latest Fiscal Year	67,758
Financing Receivable, Originated Four Years before Latest Fiscal Year	51,106
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	139,312
Financing Receivable, Revolving	717,541
Financing Receivable, after Allowance for Credit Loss	23,397
Loans and Leases Receivable, Gross	1,146,270
Home Equity Loan [Member] | Default [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	18
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	579
Financing Receivable, Revolving	2,372
Financing Receivable, after Allowance for Credit Loss	0
Loans and Leases Receivable, Gross	3,030
Home Equity Loan [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	75,161
Financing Receivable, Originated Two Years before Latest Fiscal Year	70,081
Financing Receivable, Originated Three Years before Latest Fiscal Year	67,740
Financing Receivable, Originated Four Years before Latest Fiscal Year	51,106
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	138,733
Financing Receivable, Revolving	715,169
Financing Receivable, after Allowance for Credit Loss	23,397
Loans and Leases Receivable, Gross	1,143,240
Consumer Loan [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	705
Financing Receivable, Originated Two Years before Latest Fiscal Year	356
Financing Receivable, Originated Three Years before Latest Fiscal Year	1,068
Financing Receivable, Originated Four Years before Latest Fiscal Year	1,000
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	10,889
Financing Receivable, Revolving	12,783
Financing Receivable, after Allowance for Credit Loss	414
Loans and Leases Receivable, Gross	27,215
Consumer Loan [Member] | Default [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	19
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	39
Financing Receivable, Revolving	16
Financing Receivable, after Allowance for Credit Loss	0
Loans and Leases Receivable, Gross	74
Consumer Loan [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	705
Financing Receivable, Originated Two Years before Latest Fiscal Year	356
Financing Receivable, Originated Three Years before Latest Fiscal Year	1,049
Financing Receivable, Originated Four Years before Latest Fiscal Year	1,000
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	10,850
Financing Receivable, Revolving	12,767
Financing Receivable, after Allowance for Credit Loss	414
Loans and Leases Receivable, Gross	27,141
Revolving converted to term [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	5,603
Revolving converted to term [Member] | Commercial Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	2,987
Revolving converted to term [Member] | Commercial Real Estate [Member] | Potential Weakness [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	0
Revolving converted to term [Member] | Commercial Real Estate [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	2,987
Revolving converted to term [Member] | Commercial Real Estate [Member] | Definite Weakness Loss Unlikely [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	0
Revolving converted to term [Member] | Commercial Real Estate [Member] | Partial Loss Probable [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	0
Revolving converted to term [Member] | Commercial Real Estate [Member] | Definite Loss [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	0
Revolving converted to term [Member] | Commercial And Industrial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	377
Revolving converted to term [Member] | Commercial And Industrial [Member] | Potential Weakness [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	50
Revolving converted to term [Member] | Commercial And Industrial [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	327
Revolving converted to term [Member] | Commercial And Industrial [Member] | Definite Weakness Loss Unlikely [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	0
Revolving converted to term [Member] | Commercial And Industrial [Member] | Partial Loss Probable [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	0
Revolving converted to term [Member] | Commercial And Industrial [Member] | Definite Loss [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	0
Revolving converted to term [Member] | Construction Loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	325
Revolving converted to term [Member] | Construction Loans [Member] | Potential Weakness [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	0
Revolving converted to term [Member] | Construction Loans [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	325
Revolving converted to term [Member] | Construction Loans [Member] | Definite Weakness Loss Unlikely [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	0
Revolving converted to term [Member] | Construction Loans [Member] | Partial Loss Probable [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	0
Revolving converted to term [Member] | Construction Loans [Member] | Definite Loss [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	0
Revolving converted to term [Member] | Small Business [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	0
Revolving converted to term [Member] | Small Business [Member] | Potential Weakness [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	0
Revolving converted to term [Member] | Small Business [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	0
Revolving converted to term [Member] | Small Business [Member] | Definite Weakness Loss Unlikely [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	0
Revolving converted to term [Member] | Small Business [Member] | Partial Loss Probable [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	0
Revolving converted to term [Member] | Small Business [Member] | Definite Loss [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	0
Revolving converted to term [Member] | Residential Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	0
Revolving converted to term [Member] | Residential Real Estate [Member] | Default [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	0
Revolving converted to term [Member] | Residential Real Estate [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	0
Revolving converted to term [Member] | Home Equity Loan [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	1,914
Revolving converted to term [Member] | Home Equity Loan [Member] | Default [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	61
Revolving converted to term [Member] | Home Equity Loan [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	1,853
Revolving converted to term [Member] | Consumer Loan [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	0
Revolving converted to term [Member] | Consumer Loan [Member] | Default [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	0
Revolving converted to term [Member] | Consumer Loan [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	$ 0

Loans, Allowance for Credit L_5

Loans, Allowance for Credit Losses and Credit Quality FICO and LTV (Details) - score		Mar. 31, 2020	Dec. 31, 2019
Residential Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable With Quality Of Loan Based On Weighted Average Fico Rating	[1]	749	749
Financing Receivable With Credit Quality Of Loan Based Upon the Weighted Average Loan-To-Value Ratio	[2]	58.10%	59.00%
Home Equity Line of Credit [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable With Quality Of Loan Based On Weighted Average Fico Rating	[1]	768	767
Financing Receivable With Credit Quality Of Loan Based Upon the Weighted Average Loan-To-Value Ratio	[2],[3]	46.90%	46.60%
[1]	The average FICO scores at March 31, 2020 are based upon rescores available from February 2020 and origination score data for loans booked in March 2020. The average FICO scores at December 31, 2019 were based upon rescores available from November 2019 and origination score data for loans booked in December 2019.
[2]	The combined LTV ratios for March 31, 2020 are based upon updated automated valuations as of March 2020, when available, and/or the most current valuation data available. The combined LTV ratios for December 31, 2019 were based upon updated automated valuations as of November 2019, 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.

Loans, Allowance for Credit L_6

Loans, Allowance for Credit Losses and Credit Quality Finance Receivable, Nonaccrual (Details) - USD ($) $ in Thousands		Mar. 31, 2020	Dec. 31, 2019
Financing Receivable, Nonaccrual [Line Items]
Finance Receivable, Nonaccrual, with allowance		$ 20,405
Financing Receivable, Nonaccrual, No Allowance		27,610
Tdrs Recorded Investment On Nonaccrual Status		23,842	$ 24,766
Financing Receivable, Nonaccrual	[1]	48,015	45,892
Commercial And Industrial [Member]
Financing Receivable, Nonaccrual [Line Items]
Finance Receivable, Nonaccrual, with allowance		1,078
Financing Receivable, Nonaccrual, No Allowance		20,357
Financing Receivable, Nonaccrual		21,435	22,574
Commercial Real Estate [Member]
Financing Receivable, Nonaccrual [Line Items]
Finance Receivable, Nonaccrual, with allowance		1,305
Financing Receivable, Nonaccrual, No Allowance		3,644
Financing Receivable, Nonaccrual		4,949	3,016
Construction Loans [Member]
Financing Receivable, Nonaccrual [Line Items]
Finance Receivable, Nonaccrual, with allowance		0
Financing Receivable, Nonaccrual		0	0
Small Business [Member]
Financing Receivable, Nonaccrual [Line Items]
Finance Receivable, Nonaccrual, with allowance		450
Financing Receivable, Nonaccrual		450	311
Residential Real Estate [Member]
Financing Receivable, Nonaccrual [Line Items]
Finance Receivable, Nonaccrual, with allowance		11,001
Financing Receivable, Nonaccrual, No Allowance		3,501
Financing Receivable, Nonaccrual		14,502	13,360
Home Equity Line of Credit [Member]
Financing Receivable, Nonaccrual [Line Items]
Finance Receivable, Nonaccrual, with allowance		6,463
Financing Receivable, Nonaccrual, No Allowance		108
Financing Receivable, Nonaccrual		6,571	6,570
Consumer - Other [Member]
Financing Receivable, Nonaccrual [Line Items]
Finance Receivable, Nonaccrual, with allowance		108
Financing Receivable, Nonaccrual		$ 108	$ 61
[1]	(1) Included in these amounts were $23.8 million and $24.8 million of nonaccruing TDRs at March 31, 2020 and December 31, 2019 , respectively.

Loans, Allowance for Credit L_7

Loans, Allowance for Credit Losses and Credit Quality Foreclosed Residential Real Estate Property (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Foreclosed residential real estate property held by the creditor	$ 0	$ 0
Mortgage Loans in Process of Foreclosure, Amount	$ 4,580	$ 3,294

Loans, Allowance for Credit L_8

Loans, Allowance for Credit Losses and Credit Quality Financing Receivable Past Due (Details) $ in Thousands	Mar. 31, 2020USD ($)loan	Dec. 31, 2019USD ($)loan
Financing Receivable, Past Due [Line Items]
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan	420	447
Financing Receivable, 90 Days or More Past Due, Still Accruing	$ 25	$ 2,157
Financing Receivable, Past Due	29,357	25,485
Financing Receivable, Not Past Due	8,887,073	8,848,154
Loans and Leases Receivable, Gross	$ 8,916,430	$ 8,873,639
Number Of Financing Receivables Total Past Due | loan	562	603
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan	33	43
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan	109	113
Commercial And Industrial [Member]
Financing Receivable, Past Due [Line Items]
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan	13	1
Financing Receivable, 90 Days or More Past Due, Still Accruing	$ 0	$ 0
Financing Receivable, Past Due	3,008	1,336
Financing Receivable, Not Past Due	1,445,216	1,393,700
Loans and Leases Receivable, Gross	$ 1,448,224	$ 1,395,036
Number Of Financing Receivables Total Past Due | loan	19	8
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan	0	2
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan	6	5
Commercial Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan	18	7
Financing Receivable, 90 Days or More Past Due, Still Accruing	$ 0	$ 218	[1]
Financing Receivable, Past Due	8,871	3,922
Financing Receivable, Not Past Due	4,052,476	3,998,437
Loans and Leases Receivable, Gross	$ 4,061,347	$ 4,002,359
Number Of Financing Receivables Total Past Due | loan	27	16
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan	2	1
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan	7	8
Construction Loans [Member]
Financing Receivable, Past Due [Line Items]
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan	1	1
Financing Receivable, 90 Days or More Past Due, Still Accruing	$ 0	$ 0
Financing Receivable, Past Due	331	560
Financing Receivable, Not Past Due	526,807	546,733
Loans and Leases Receivable, Gross	$ 527,138	$ 547,293
Number Of Financing Receivables Total Past Due | loan	1	1
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan	0	0
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan	0	0
Small Business [Member]
Financing Receivable, Past Due [Line Items]
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan	12	11
Financing Receivable, 90 Days or More Past Due, Still Accruing	$ 0	$ 0
Financing Receivable, Past Due	1,391	967
Financing Receivable, Not Past Due	176,429	173,530
Loans and Leases Receivable, Gross	$ 177,820	$ 174,497
Number Of Financing Receivables Total Past Due | loan	25	20
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan	8	3
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan	5	6
Residential Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan	19	17
Financing Receivable, 90 Days or More Past Due, Still Accruing	$ 0	$ 1,652	[1]
Financing Receivable, Past Due	9,866	12,312
Financing Receivable, Not Past Due	1,518,550	1,578,257
Loans and Leases Receivable, Gross	$ 1,528,416	$ 1,590,569
Number Of Financing Receivables Total Past Due | loan	63	72
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan	5	17
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan	39	38
Home Equity Line of Credit [Member]
Financing Receivable, Past Due [Line Items]
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan	22	23
Financing Receivable, 90 Days or More Past Due, Still Accruing	$ 0	$ 265	[1]
Financing Receivable, Past Due	5,338	6,067
Financing Receivable, Not Past Due	1,140,932	1,127,731
Loans and Leases Receivable, Gross	$ 1,146,270	$ 1,133,798
Number Of Financing Receivables Total Past Due | loan	65	71
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan	7	8
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan	36	40
Consumer - Other [Member]
Financing Receivable, Past Due [Line Items]
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan	335	387	[2]
Financing Receivable, 90 Days or More Past Due, Still Accruing	$ 25	$ 22	[2]
Financing Receivable, Past Due	552	321	[2]
Financing Receivable, Not Past Due	26,663	29,766	[2]
Loans and Leases Receivable, Gross	$ 27,215	$ 30,087	[2]
Number Of Financing Receivables Total Past Due | loan	362	415	[2]
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan	11	12	[2]
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan	16	16	[2]
Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	$ 2,430	$ 4,155
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial And Industrial [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	0	323
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	383	194
Financial Asset, 60 to 89 Days Past Due [Member] | Construction Loans [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	0	0
Financial Asset, 60 to 89 Days Past Due [Member] | Small Business [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	185	15
Financial Asset, 60 to 89 Days Past Due [Member] | Residential Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	994	3,055
Financial Asset, 60 to 89 Days Past Due [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	801	524
Financial Asset, 60 to 89 Days Past Due [Member] | Consumer - Other [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	67	44	[2]
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	12,140	13,819
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial And Industrial [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	1,078	760
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	1,499	2,038
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Construction Loans [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Small Business [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	176	115
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Residential Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	6,258	7,020
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	3,030	3,854
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Consumer - Other [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	99	32	[2]
Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	14,787	7,511
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial And Industrial [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	1,930	253
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	6,989	1,690
Financial Asset, 30 to 59 Days Past Due [Member] | Construction Loans [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	331	560
Financial Asset, 30 to 59 Days Past Due [Member] | Small Business [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	1,030	837
Financial Asset, 30 to 59 Days Past Due [Member] | Residential Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	2,614	2,237
Financial Asset, 30 to 59 Days Past Due [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	1,507	1,689
Financial Asset, 30 to 59 Days Past Due [Member] | Consumer - Other [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	$ 386	$ 245	[2]
[1]	(2) Represents purchased credit impaired loans that were accruing interest due to expectations of future cash collections.
[2]	(1) Other consumer portfolio is inclusive of deposit account overdrafts recorded as loan balances.

Loans, Allowance for Credit L_9

Loans, Allowance for Credit Losses and Credit Quality Troubled Debt Restructurings (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Financing Receivable, Troubled Debt Restructuring [Line Items]
Tdrs Recorded Investment On Accrual Status	$ 18,129	$ 19,599
Tdrs Recorded Investment On Nonaccrual Status	23,842	24,766
Financing Receivable Recorded Investment Trouble Debt Restructuring	41,971	44,365
Amount Of Specific Reserves Included In Allowance For Loan Losses Associated With Trouble Debt Restructuring		855
Additional Commitments To Lend To Borrower For Trouble Debt Restructuring	$ 163	$ 63

Loans, Allowance for Credit _10

Loans, Allowance for Credit Losses and Credit Quality Schedule of Debtor Troubled Debt Restructurings, Subsequent Period (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020USD ($)contract	Mar. 31, 2019USD ($)contract
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract	5	2
Financing Receivable, Troubled Debt Restructuring, Premodification	$ 1,098	$ 225
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 1,106	$ 225
Commercial And Industrial [Member]
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract	2
Financing Receivable, Troubled Debt Restructuring, Premodification	$ 268
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 268
Commercial Real Estate [Member]
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract	1	1
Financing Receivable, Troubled Debt Restructuring, Premodification	$ 604	$ 150
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 604	$ 150
Small Business [Member]
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract	1
Financing Receivable, Troubled Debt Restructuring, Premodification	$ 49
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 25
Residential Real Estate [Member]
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract	1
Financing Receivable, Troubled Debt Restructuring, Premodification	$ 177
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 209
Home Equity Line of Credit [Member]
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract		1
Financing Receivable, Troubled Debt Restructuring, Premodification		$ 75
Financing Receivable, Troubled Debt Restructuring, Postmodification		$ 75

Loans, Allowance for Credit _11

Loans, Allowance for Credit Losses and Credit Quality TDR on Financing Receivables Post Modification (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 1,106	$ 225
Contractual Interest Rate Reduction [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Troubled Debt Restructuring, Postmodification	604	150
Court ordered concession
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Troubled Debt Restructuring, Postmodification	25	75
Extended Maturity [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 477	$ 0

Loans, Allowance for Credit _12

Loans, Allowance for Credit Losses and Credit Quality Textual (Details)	3 Months Ended
	Mar. 31, 2020USD ($)contract	Mar. 31, 2019USD ($)contract	Jan. 01, 2020USD ($)	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)
Credit Loss [Abstract]
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method	$ (1,137,000)
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase	1,157,000
Interest Receivable	25,900,000
Loans and Leases Receivable, Allowance	(92,376,000)	$ (65,140,000)		$ (67,740,000)	$ (64,293,000)
Off-Balance Sheet, Credit Loss, Liability	$ 650,000		$ 1,100,000
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | contract	0	0
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)	$ 24,600,000

Loans, Allowance for Loan Los_3

Loans, Allowance for Loan Losses and Credit Quality (ALLL - by category) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Financing Receivable Impaired [Line Items]
Financing Receivable, after Allowance for Credit Loss			$ 6,119,185
Summary of changes in allowance for loan losses
Beginning Balance	$ 67,740	$ 64,293
Charge-offs		(559)
Recoveries		406
Provision for credit losses	25,000	1,000
Ending Balance	$ 92,376	65,140
Ending Balance: Individually Evaluated for Impairment		1,104	980
Ending Balance: Collectively Evaluated for Impairment		64,036
Commercial and Industrial [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, after Allowance for Credit Loss			1,395,036
Summary of changes in allowance for loan losses
Beginning Balance		15,760
Charge-offs		0
Recoveries		124
Provision for credit losses		988
Ending Balance		16,872
Ending Balance: Individually Evaluated for Impairment		58	126
Ending Balance: Collectively Evaluated for Impairment		16,814
Commercial Real Estate [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, after Allowance for Credit Loss			4,002,359
Summary of changes in allowance for loan losses
Beginning Balance		32,370
Charge-offs		0
Recoveries		33
Provision for credit losses		(354)
Ending Balance		32,049
Ending Balance: Individually Evaluated for Impairment		75	48
Ending Balance: Collectively Evaluated for Impairment		31,974
Construction Loans [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, after Allowance for Credit Loss			547,293
Summary of changes in allowance for loan losses
Beginning Balance		5,158
Charge-offs		0
Recoveries		0
Provision for credit losses		197
Ending Balance		5,355
Ending Balance: Individually Evaluated for Impairment		0
Ending Balance: Collectively Evaluated for Impairment		5,355
Small Business [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, after Allowance for Credit Loss			174,497
Summary of changes in allowance for loan losses
Beginning Balance		1,756
Charge-offs		(145)
Recoveries		27
Provision for credit losses		146
Ending Balance		1,784
Ending Balance: Individually Evaluated for Impairment		1	8
Ending Balance: Collectively Evaluated for Impairment		1,783
Residential Real Estate [Member]
Summary of changes in allowance for loan losses
Beginning Balance		3,219
Charge-offs		0
Recoveries		1
Provision for credit losses		14
Ending Balance		3,234
Ending Balance: Individually Evaluated for Impairment		802	637
Ending Balance: Collectively Evaluated for Impairment		2,432
Consumer Home Equity [Member]
Summary of changes in allowance for loan losses
Beginning Balance		5,608
Charge-offs		(113)
Recoveries		66
Provision for credit losses		(54)
Ending Balance		5,507
Ending Balance: Individually Evaluated for Impairment		161	156
Ending Balance: Collectively Evaluated for Impairment		5,346
Consumer - Other [Member]
Summary of changes in allowance for loan losses
Beginning Balance		422
Charge-offs		(301)
Recoveries		155
Provision for credit losses		63
Ending Balance		339
Ending Balance: Individually Evaluated for Impairment		7	5
Ending Balance: Collectively Evaluated for Impairment		$ 332
Financial Asset Acquired with Credit Deterioration [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, after Allowance for Credit Loss			14,856
Financial Asset Acquired with Credit Deterioration [Member] | Commercial and Industrial [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, after Allowance for Credit Loss			0
Financial Asset Acquired with Credit Deterioration [Member] | Commercial Real Estate [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, after Allowance for Credit Loss			6,174
Financial Asset Acquired with Credit Deterioration [Member] | Construction Loans [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, after Allowance for Credit Loss			0
Financial Asset Acquired with Credit Deterioration [Member] | Small Business [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, after Allowance for Credit Loss			0
Financial Asset Acquired with Credit Deterioration [Member] | Residential Real Estate [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, after Allowance for Credit Loss			7,493
Financial Asset Acquired with Credit Deterioration [Member] | Consumer Home Equity [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, after Allowance for Credit Loss			887
Financial Asset Acquired with Credit Deterioration [Member] | Consumer - Other [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, after Allowance for Credit Loss			$ 302

Loans, Allowance for Loan Los_4

Loans, Allowance for Loan Losses and Credit Quality (Internal Risk-Rating Categories for the Commercial Portfolio) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss [Line Items]
Significant Advanced Considered For Risk Rating Change	$ 50,000
Internal risk-rating categories for the Company's commercial portfolio
TOTAL		$ 6,119,185,000
Commercial and Industrial [Member]
Internal risk-rating categories for the Company's commercial portfolio
TOTAL		1,395,036,000
Commercial Real Estate [Member]
Internal risk-rating categories for the Company's commercial portfolio
TOTAL		4,002,359,000
Commercial Construction [Member]
Internal risk-rating categories for the Company's commercial portfolio
TOTAL		547,293,000
Small Business [Member]
Internal risk-rating categories for the Company's commercial portfolio
TOTAL		174,497,000
PASS [Member]
Internal risk-rating categories for the Company's commercial portfolio
TOTAL		5,848,531,000
PASS [Member] | Commercial and Industrial [Member]
Internal risk-rating categories for the Company's commercial portfolio
TOTAL		1,274,155,000
PASS [Member] | Commercial Real Estate [Member]
Internal risk-rating categories for the Company's commercial portfolio
TOTAL		3,860,555,000
PASS [Member] | Commercial Construction [Member]
Internal risk-rating categories for the Company's commercial portfolio
TOTAL		542,608,000
PASS [Member] | Small Business [Member]
Internal risk-rating categories for the Company's commercial portfolio
TOTAL		171,213,000
POTENTIAL WEAKNESS [Member]
Internal risk-rating categories for the Company's commercial portfolio
TOTAL		164,416,000
POTENTIAL WEAKNESS [Member] | Commercial and Industrial [Member]
Internal risk-rating categories for the Company's commercial portfolio
TOTAL		63,485,000
POTENTIAL WEAKNESS [Member] | Commercial Real Estate [Member]
Internal risk-rating categories for the Company's commercial portfolio
TOTAL		97,268,000
POTENTIAL WEAKNESS [Member] | Commercial Construction [Member]
Internal risk-rating categories for the Company's commercial portfolio
TOTAL		2,247,000
POTENTIAL WEAKNESS [Member] | Small Business [Member]
Internal risk-rating categories for the Company's commercial portfolio
TOTAL		1,416,000
DEFINITE WEAKNESS-LOSS UNLIKELY [Member]
Internal risk-rating categories for the Company's commercial portfolio
TOTAL		106,238,000
DEFINITE WEAKNESS-LOSS UNLIKELY [Member] | Commercial and Industrial [Member]
Internal risk-rating categories for the Company's commercial portfolio
TOTAL		57,396,000
DEFINITE WEAKNESS-LOSS UNLIKELY [Member] | Commercial Real Estate [Member]
Internal risk-rating categories for the Company's commercial portfolio
TOTAL		44,536,000
DEFINITE WEAKNESS-LOSS UNLIKELY [Member] | Commercial Construction [Member]
Internal risk-rating categories for the Company's commercial portfolio
TOTAL		2,438,000
DEFINITE WEAKNESS-LOSS UNLIKELY [Member] | Small Business [Member]
Internal risk-rating categories for the Company's commercial portfolio
TOTAL		1,868,000
PARTIAL LOSS PROBABLE [Member]
Internal risk-rating categories for the Company's commercial portfolio
TOTAL		0
PARTIAL LOSS PROBABLE [Member] | Commercial and Industrial [Member]
Internal risk-rating categories for the Company's commercial portfolio
TOTAL		0
PARTIAL LOSS PROBABLE [Member] | Commercial Real Estate [Member]
Internal risk-rating categories for the Company's commercial portfolio
TOTAL		0
PARTIAL LOSS PROBABLE [Member] | Commercial Construction [Member]
Internal risk-rating categories for the Company's commercial portfolio
TOTAL		0
PARTIAL LOSS PROBABLE [Member] | Small Business [Member]
Internal risk-rating categories for the Company's commercial portfolio
TOTAL		0
DEFINITE LOSS [Member]
Internal risk-rating categories for the Company's commercial portfolio
TOTAL		0
DEFINITE LOSS [Member] | Commercial and Industrial [Member]
Internal risk-rating categories for the Company's commercial portfolio
TOTAL		0
DEFINITE LOSS [Member] | Commercial Real Estate [Member]
Internal risk-rating categories for the Company's commercial portfolio
TOTAL		0
DEFINITE LOSS [Member] | Commercial Construction [Member]
Internal risk-rating categories for the Company's commercial portfolio
TOTAL		0
DEFINITE LOSS [Member] | Small Business [Member]
Internal risk-rating categories for the Company's commercial portfolio
TOTAL		$ 0

Loans, Allowance for Loan Los_5

Loans, Allowance for Loan Losses and Credit Quality (Weighted Average FICO Scores and the Weighted Average Combined LTV Ratio) (Details) - score		Mar. 31, 2020	Dec. 31, 2019
Residential Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable With Quality Of Loan Based On Weighted Average Fico Rating	[1]	749	749
Financing Receivable With Credit Quality Of Loan Based Upon the Weighted Average Loan-To-Value Ratio	[2]	58.10%	59.00%
Consumer Home Equity [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable With Quality Of Loan Based On Weighted Average Fico Rating	[1]	768	767
Financing Receivable With Credit Quality Of Loan Based Upon the Weighted Average Loan-To-Value Ratio	[2],[3]	46.90%	46.60%
[1]	The average FICO scores at March 31, 2020 are based upon rescores available from February 2020 and origination score data for loans booked in March 2020. The average FICO scores at December 31, 2019 were based upon rescores available from November 2019 and origination score data for loans booked in December 2019.
[2]	The combined LTV ratios for March 31, 2020 are based upon updated automated valuations as of March 2020, when available, and/or the most current valuation data available. The combined LTV ratios for December 31, 2019 were based upon updated automated valuations as of November 2019, 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.

Loans, Allowance for Loan Los_6

Loans, Allowance for Loan Losses and Credit Quality (Summary of Nonaccrual Loans) (Details) - USD ($) $ in Thousands		Mar. 31, 2020	Dec. 31, 2019
Financing Receivable Impaired [Line Items]
Tdrs Recorded Investment On Nonaccrual Status		$ 23,842	$ 24,766
Financing Receivable, Nonaccrual	[1]	48,015	45,892
Commercial and Industrial [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Nonaccrual		21,435	22,574
Commercial Real Estate [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Nonaccrual		4,949	3,016
Construction Loans [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Nonaccrual		0	0
Small Business [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Nonaccrual		450	311
Residential Real Estate [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Nonaccrual		14,502	13,360
Consumer Home Equity [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Nonaccrual		6,571	6,570
Consumer - Other [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Nonaccrual		$ 108	$ 61
[1]	(1) Included in these amounts were $23.8 million and $24.8 million of nonaccruing TDRs at March 31, 2020 and December 31, 2019 , respectively.

Loans, Allowance for Loan Los_7

Loans, Allowance for Loan Losses and Credit Quality Foreclosed Residential Real Estate Property (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Foreclosed Residential Real Estate Property [Abstract]
Foreclosed residential real estate property held by the creditor	$ 0	$ 0
Recorded investment in mortgage loans collateralized by residential real estate property that are in the process of foreclosure	$ 4,580	$ 3,294

Loans, Allowance for Loan Los_8

Loans, Allowance for Loan Losses and Credit Quality (Age Analysis of Past Due Financing Receivables) (Details) $ in Thousands	Mar. 31, 2020USD ($)loan	Dec. 31, 2019USD ($)loan
Age Analysis of Past Due Financing Receivables
Number of Loans 30-59 Days | loan	420	447
Number of Loans 60-89 Days | loan	33	43
Number of Loans 90 Days or More | loan	109	113
Number of Loans Total Past Due | loan	562	603
Principal Balance Total Past Due	$ 29,357	$ 25,485
Current	8,887,073	8,848,154
Total loans	8,916,430	8,873,639
Recorded Investment >90 Days and Accruing	$ 25	$ 2,157
Commercial and Industrial [Member]
Age Analysis of Past Due Financing Receivables
Number of Loans 30-59 Days | loan	13	1
Number of Loans 60-89 Days | loan	0	2
Number of Loans 90 Days or More | loan	6	5
Number of Loans Total Past Due | loan	19	8
Principal Balance Total Past Due	$ 3,008	$ 1,336
Current	1,445,216	1,393,700
Total loans	1,448,224	1,395,036
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	18	7
Number of Loans 60-89 Days | loan	2	1
Number of Loans 90 Days or More | loan	7	8
Number of Loans Total Past Due | loan	27	16
Principal Balance Total Past Due	$ 8,871	$ 3,922
Current	4,052,476	3,998,437
Total loans	4,061,347	4,002,359
Recorded Investment >90 Days and Accruing	$ 0	$ 218	[1]
Construction Loans [Member]
Age Analysis of Past Due Financing Receivables
Number of Loans 30-59 Days | loan	1	1
Number of Loans 60-89 Days | loan	0	0
Number of Loans 90 Days or More | loan	0	0
Number of Loans Total Past Due | loan	1	1
Principal Balance Total Past Due	$ 331	$ 560
Current	526,807	546,733
Total loans	527,138	547,293
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	12	11
Number of Loans 60-89 Days | loan	8	3
Number of Loans 90 Days or More | loan	5	6
Number of Loans Total Past Due | loan	25	20
Principal Balance Total Past Due	$ 1,391	$ 967
Current	176,429	173,530
Total loans	177,820	174,497
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	19	17
Number of Loans 60-89 Days | loan	5	17
Number of Loans 90 Days or More | loan	39	38
Number of Loans Total Past Due | loan	63	72
Principal Balance Total Past Due	$ 9,866	$ 12,312
Current	1,518,550	1,578,257
Total loans	1,528,416	1,590,569
Recorded Investment >90 Days and Accruing	$ 0	$ 1,652	[1]
Consumer Home Equity [Member]
Age Analysis of Past Due Financing Receivables
Number of Loans 30-59 Days | loan	22	23
Number of Loans 60-89 Days | loan	7	8
Number of Loans 90 Days or More | loan	36	40
Number of Loans Total Past Due | loan	65	71
Principal Balance Total Past Due	$ 5,338	$ 6,067
Current	1,140,932	1,127,731
Total loans	1,146,270	1,133,798
Recorded Investment >90 Days and Accruing	$ 0	$ 265	[1]
Consumer - Other [Member]
Age Analysis of Past Due Financing Receivables
Number of Loans 30-59 Days | loan	335	387	[2]
Number of Loans 60-89 Days | loan	11	12	[2]
Number of Loans 90 Days or More | loan	16	16	[2]
Number of Loans Total Past Due | loan	362	415	[2]
Principal Balance Total Past Due	$ 552	$ 321	[2]
Current	26,663	29,766	[2]
Total loans	27,215	30,087	[2]
Recorded Investment >90 Days and Accruing	25	22	[2]
Financial Asset, 30 to 59 Days Past Due [Member]
Age Analysis of Past Due Financing Receivables
Principal Balance Total Past Due	14,787	7,511
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial and Industrial [Member]
Age Analysis of Past Due Financing Receivables
Principal Balance Total Past Due	1,930	253
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Real Estate [Member]
Age Analysis of Past Due Financing Receivables
Principal Balance Total Past Due	6,989	1,690
Financial Asset, 30 to 59 Days Past Due [Member] | Construction Loans [Member]
Age Analysis of Past Due Financing Receivables
Principal Balance Total Past Due	331	560
Financial Asset, 30 to 59 Days Past Due [Member] | Small Business [Member]
Age Analysis of Past Due Financing Receivables
Principal Balance Total Past Due	1,030	837
Financial Asset, 30 to 59 Days Past Due [Member] | Residential Real Estate [Member]
Age Analysis of Past Due Financing Receivables
Principal Balance Total Past Due	2,614	2,237
Financial Asset, 30 to 59 Days Past Due [Member] | Consumer Home Equity [Member]
Age Analysis of Past Due Financing Receivables
Principal Balance Total Past Due	1,507	1,689
Financial Asset, 30 to 59 Days Past Due [Member] | Consumer - Other [Member]
Age Analysis of Past Due Financing Receivables
Principal Balance Total Past Due	386	245	[2]
Financial Asset, 60 to 89 Days Past Due [Member]
Age Analysis of Past Due Financing Receivables
Principal Balance Total Past Due	2,430	4,155
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial and Industrial [Member]
Age Analysis of Past Due Financing Receivables
Principal Balance Total Past Due	0	323
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Real Estate [Member]
Age Analysis of Past Due Financing Receivables
Principal Balance Total Past Due	383	194
Financial Asset, 60 to 89 Days Past Due [Member] | Construction Loans [Member]
Age Analysis of Past Due Financing Receivables
Principal Balance Total Past Due	0	0
Financial Asset, 60 to 89 Days Past Due [Member] | Small Business [Member]
Age Analysis of Past Due Financing Receivables
Principal Balance Total Past Due	185	15
Financial Asset, 60 to 89 Days Past Due [Member] | Residential Real Estate [Member]
Age Analysis of Past Due Financing Receivables
Principal Balance Total Past Due	994	3,055
Financial Asset, 60 to 89 Days Past Due [Member] | Consumer Home Equity [Member]
Age Analysis of Past Due Financing Receivables
Principal Balance Total Past Due	801	524
Financial Asset, 60 to 89 Days Past Due [Member] | Consumer - Other [Member]
Age Analysis of Past Due Financing Receivables
Principal Balance Total Past Due	67	44	[2]
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Age Analysis of Past Due Financing Receivables
Principal Balance Total Past Due	12,140	13,819
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial and Industrial [Member]
Age Analysis of Past Due Financing Receivables
Principal Balance Total Past Due	1,078	760
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Real Estate [Member]
Age Analysis of Past Due Financing Receivables
Principal Balance Total Past Due	1,499	2,038
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Construction Loans [Member]
Age Analysis of Past Due Financing Receivables
Principal Balance Total Past Due	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Small Business [Member]
Age Analysis of Past Due Financing Receivables
Principal Balance Total Past Due	176	115
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Residential Real Estate [Member]
Age Analysis of Past Due Financing Receivables
Principal Balance Total Past Due	6,258	7,020
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Consumer Home Equity [Member]
Age Analysis of Past Due Financing Receivables
Principal Balance Total Past Due	3,030	3,854
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Consumer - Other [Member]
Age Analysis of Past Due Financing Receivables
Principal Balance Total Past Due	$ 99	$ 32	[2]
[1]	(2) Represents purchased credit impaired loans that were accruing interest due to expectations of future cash collections.
[2]	(1) Other consumer portfolio is inclusive of deposit account overdrafts recorded as loan balances.

Loans, Allowance for Loan Los_9

Loans, Allowance for Loan Losses and Credit Quality (Modifications which occurred during the period & change in recorded investment) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020USD ($)contract	Mar. 31, 2019USD ($)contract
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract	5	2
TROUBLED DEBT RESTRUCTURINGS:
Financing Receivable, Troubled Debt Restructuring, Premodification	$ 1,098	$ 225
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 1,106	$ 225
Commercial and Industrial [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract	2
TROUBLED DEBT RESTRUCTURINGS:
Financing Receivable, Troubled Debt Restructuring, Premodification	$ 268
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 268
Commercial Real Estate [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract	1	1
TROUBLED DEBT RESTRUCTURINGS:
Financing Receivable, Troubled Debt Restructuring, Premodification	$ 604	$ 150
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 604	$ 150
Small Business [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract	1
TROUBLED DEBT RESTRUCTURINGS:
Financing Receivable, Troubled Debt Restructuring, Premodification	$ 49
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 25
Residential Real Estate [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract	1
TROUBLED DEBT RESTRUCTURINGS:
Financing Receivable, Troubled Debt Restructuring, Premodification	$ 177
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 209
Consumer Home Equity [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract		1
TROUBLED DEBT RESTRUCTURINGS:
Financing Receivable, Troubled Debt Restructuring, Premodification		$ 75
Financing Receivable, Troubled Debt Restructuring, Postmodification		$ 75

Loans, Allowance for Loan Lo_10

Loans, Allowance for Loan Losses and Credit Quality (Impaired Loans by Portfolio) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Mar. 31, 2019
Impaired loans by loan portfolio
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	$ 980	$ 1,104
Related Allowance	980
Impaired Financing Receivable, Recorded Investment, Total	49,628
Impaired Financing Receivable, Unpaid Principal Balance	68,140
WITH NO RELATED ALLOWANCE RECORDED: [Member]
Impaired loans by loan portfolio
Recorded Investment	39,242
Unpaid Principal Balance	56,605
Related Allowance	0
WITH AN ALLOWANCE RECORDED: [Member]
Impaired loans by loan portfolio
Recorded Investment	10,386
Unpaid Principal Balance	11,535
Commercial and Industrial [Member]
Impaired loans by loan portfolio
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	126	58
Commercial and Industrial [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member]
Impaired loans by loan portfolio
Recorded Investment	23,786
Unpaid Principal Balance	34,970
Related Allowance	0
Commercial and Industrial [Member] | WITH AN ALLOWANCE RECORDED: [Member]
Impaired loans by loan portfolio
Recorded Investment	670
Unpaid Principal Balance	670
Commercial Real Estate [Member]
Impaired loans by loan portfolio
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	48	75
Commercial Real Estate [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member]
Impaired loans by loan portfolio
Recorded Investment	6,213
Unpaid Principal Balance	12,101
Related Allowance	0
Commercial Real Estate [Member] | WITH AN ALLOWANCE RECORDED: [Member]
Impaired loans by loan portfolio
Recorded Investment	2,124
Unpaid Principal Balance	2,124
Construction Loans [Member]
Impaired loans by loan portfolio
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment		0
Small Business [Member]
Impaired loans by loan portfolio
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	8	1
Small Business [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member]
Impaired loans by loan portfolio
Recorded Investment	469
Unpaid Principal Balance	484
Related Allowance	0
Small Business [Member] | WITH AN ALLOWANCE RECORDED: [Member]
Impaired loans by loan portfolio
Recorded Investment	68
Unpaid Principal Balance	105
Residential Real Estate [Member]
Impaired loans by loan portfolio
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	637	802
Residential Real Estate [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member]
Impaired loans by loan portfolio
Recorded Investment	4,976
Unpaid Principal Balance	5,123
Related Allowance	0
Residential Real Estate [Member] | WITH AN ALLOWANCE RECORDED: [Member]
Impaired loans by loan portfolio
Recorded Investment	6,252
Unpaid Principal Balance	7,163
Consumer Home Equity [Member]
Impaired loans by loan portfolio
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	156	161
Consumer Home Equity [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member]
Impaired loans by loan portfolio
Recorded Investment	3,764
Unpaid Principal Balance	3,893
Related Allowance	0
Consumer Home Equity [Member] | WITH AN ALLOWANCE RECORDED: [Member]
Impaired loans by loan portfolio
Recorded Investment	1,184
Unpaid Principal Balance	1,382
Consumer - Other [Member]
Impaired loans by loan portfolio
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	5	$ 7
Consumer - Other [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member]
Impaired loans by loan portfolio
Recorded Investment	34
Unpaid Principal Balance	34
Related Allowance	0
Consumer - Other [Member] | WITH AN ALLOWANCE RECORDED: [Member]
Impaired loans by loan portfolio
Recorded Investment	88
Unpaid Principal Balance	$ 91

Loans, Allowance for Loan Lo_11

Loans, Allowance for Loan Losses and Credit Quality (Int Inc. Recognized on Impaired Loans by Portfolio) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020USD ($)
Interest income recognized on impaired loans
Average Recorded Investment	$ 60,280
Interest Income Recognized	357
WITH NO RELATED ALLOWANCE RECORDED: [Member]
Interest income recognized on impaired loans
Average Recorded Investment	49,131
Interest Income Recognized	251
WITH AN ALLOWANCE RECORDED: [Member]
Interest income recognized on impaired loans
Average Recorded Investment	11,149
Interest Income Recognized	106
Commercial and Industrial [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member]
Interest income recognized on impaired loans
Average Recorded Investment	30,198
Interest Income Recognized	35
Commercial and Industrial [Member] | WITH AN ALLOWANCE RECORDED: [Member]
Interest income recognized on impaired loans
Average Recorded Investment	498
Interest Income Recognized	3
Commercial Real Estate [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member]
Interest income recognized on impaired loans
Average Recorded Investment	8,873
Interest Income Recognized	104
Commercial Real Estate [Member] | WITH AN ALLOWANCE RECORDED: [Member]
Interest income recognized on impaired loans
Average Recorded Investment	1,682
Interest Income Recognized	24
Construction Loans [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member]
Interest income recognized on impaired loans
Average Recorded Investment	311
Interest Income Recognized	0
Small Business [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member]
Interest income recognized on impaired loans
Average Recorded Investment	323
Interest Income Recognized	2
Small Business [Member] | WITH AN ALLOWANCE RECORDED: [Member]
Interest income recognized on impaired loans
Average Recorded Investment	181
Interest Income Recognized	2
Residential Real Estate [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member]
Interest income recognized on impaired loans
Average Recorded Investment	4,421
Interest Income Recognized	54
Residential Real Estate [Member] | WITH AN ALLOWANCE RECORDED: [Member]
Interest income recognized on impaired loans
Average Recorded Investment	7,665
Interest Income Recognized	64
Consumer Home Equity [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member]
Interest income recognized on impaired loans
Average Recorded Investment	4,952
Interest Income Recognized	55
Consumer Home Equity [Member] | WITH AN ALLOWANCE RECORDED: [Member]
Interest income recognized on impaired loans
Average Recorded Investment	985
Interest Income Recognized	12
Consumer - Other [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member]
Interest income recognized on impaired loans
Average Recorded Investment	53
Interest Income Recognized	1
Consumer - Other [Member] | WITH AN ALLOWANCE RECORDED: [Member]
Interest income recognized on impaired loans
Average Recorded Investment	138
Interest Income Recognized	$ 1

Loans, Allowance for Loan Lo_12

Loans, Allowance for Loan Losses and Credit Quality (Purchased Credit Impaired Loans - Outstanding/Carrying balances) (Details) $ in Thousands	Dec. 31, 2019USD ($)
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Outstanding balance	$ 18,358
Financing Receivable, after Allowance for Credit Loss	6,119,185
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, after Allowance for Credit Loss	$ 14,856

Loans, Allowance for Loan Lo_13

Loans, Allowance for Loan Losses and Credit Quality (Activity in the Accretable Yield for PCI loans) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019USD ($)
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Accretable Yield, Beginning of Period	$ 1,191
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Accretion	(141)
Certainloansacquiredinatransfernotaccountedforasdebtsecuritiesaccretableyieldadjustmentchangesinexpectedcashflow	114	[1]
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Accretable Yield, Reclassifications from Nonaccretable Difference	0
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Accretable Yield, End of Period	$ 1,164
[1]	(1) Represents changes in cash flows expected to be collected and resulting in increased interest income as a prospective yield adjustment over the remaining life of the loan(s).

Loans, Allowance for Loan Lo_14

Loans, Allowance for Loan Losses and Credit Quality (Textual) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend		$ 2,100,000
Financing Receivable, Troubled Debt Restructuring, Subsequent Default	$ 0
Significant Advanced Considered For Risk Rating Change	$ 50,000
Days to be termed as non accrual loans	90 days
Tdrs Recorded Investment On Nonaccrual Status	$ 23,842,000	$ 24,766,000

Loans, Allowance for Loan Lo_15

Loans, Allowance for Loan Losses and Credit Quality Finance Receivables Bifurcated by type of impairment evaluation (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Collectively Evaluated for Impairment		$ 8,809,155
Financing Receivable, Individually Evaluated for Impairment		49,628
Financing Receivable, after Allowance for Credit Loss		6,119,185
Loans and Leases Receivable, Gross	$ 8,916,430	8,873,639
Unamortized Loan Commitment and Origination fees		7,100
Unamortized Discounts or Premiums		21,600
Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Collectively Evaluated for Impairment		1,370,580
Financing Receivable, Individually Evaluated for Impairment		24,456
Financing Receivable, after Allowance for Credit Loss		1,395,036
Financing Receivable, before Allowance for Credit Loss	1,448,224	1,395,036
Loans and Leases Receivable, Gross	1,448,224	1,395,036
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Collectively Evaluated for Impairment		3,987,848
Financing Receivable, Individually Evaluated for Impairment		8,337
Financing Receivable, after Allowance for Credit Loss		4,002,359
Financing Receivable, before Allowance for Credit Loss	4,061,347	4,002,359
Loans and Leases Receivable, Gross	4,061,347	4,002,359
Construction Loans [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Collectively Evaluated for Impairment		547,293
Financing Receivable, Individually Evaluated for Impairment		0
Financing Receivable, after Allowance for Credit Loss		547,293
Financing Receivable, before Allowance for Credit Loss	527,138	547,293
Loans and Leases Receivable, Gross	527,138	547,293
Small Business [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Collectively Evaluated for Impairment		173,960
Financing Receivable, Individually Evaluated for Impairment		537
Financing Receivable, after Allowance for Credit Loss		174,497
Financing Receivable, before Allowance for Credit Loss	177,820	174,497
Loans and Leases Receivable, Gross	177,820	174,497
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Collectively Evaluated for Impairment		1,571,848
Financing Receivable, Individually Evaluated for Impairment		11,228
Financing Receivable, before Allowance for Credit Loss	1,528,416	1,590,569
Loans and Leases Receivable, Gross	1,528,416	1,590,569
Home Equity Line of Credit [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Collectively Evaluated for Impairment		1,127,963
Financing Receivable, Individually Evaluated for Impairment		4,948
Loans and Leases Receivable, Gross	1,146,270	1,133,798
Consumer - Other [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Collectively Evaluated for Impairment		29,663
Financing Receivable, Individually Evaluated for Impairment		122
Financing Receivable, before Allowance for Credit Loss	27,215	30,087
Loans and Leases Receivable, Gross	$ 27,215	30,087	[1]
Financial Asset Acquired with Credit Deterioration [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, after Allowance for Credit Loss		14,856
Financial Asset Acquired with Credit Deterioration [Member] | Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, after Allowance for Credit Loss		0
Financial Asset Acquired with Credit Deterioration [Member] | Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, after Allowance for Credit Loss		6,174
Financial Asset Acquired with Credit Deterioration [Member] | Construction Loans [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, after Allowance for Credit Loss		0
Financial Asset Acquired with Credit Deterioration [Member] | Small Business [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, after Allowance for Credit Loss		0
Financial Asset Acquired with Credit Deterioration [Member] | Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, after Allowance for Credit Loss		7,493
Financial Asset Acquired with Credit Deterioration [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, after Allowance for Credit Loss		887
Financial Asset Acquired with Credit Deterioration [Member] | Consumer - Other [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, after Allowance for Credit Loss		$ 302
[1]	(1) Other consumer portfolio is inclusive of deposit account overdrafts recorded as loan balances.

Goodwill Schedule of Intangible

Goodwill Schedule of Intangible Assets and Goodwill table (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Net (Excluding Goodwill)	$ 27,466	$ 29,286
Intangible Assets, Net (Including Goodwill)	533,672	535,492
Core Deposits [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Net (Excluding Goodwill)	26,485	28,016
Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Net (Excluding Goodwill)	$ 981	$ 1,270

Earnings Per Share (EPS Compone

Earnings Per Share (EPS Components) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Summary of earnings per share
Net income	$ 26,751	$ 35,225
Weighted Average Shares (in shares)
BASIC SHARES	34,184,431	28,106,184
EFFECT OF DILUTIVE SECURITIES	36,827	54,466
DILUTIVE SHARES	34,221,258	28,160,650
NET INCOME PER SHARE (in dollars per share)
BASIC EPS	$ 0.78	$ 1.25
EFFECT OF DILUTIVE SECURITIES	0	0
DILUTIVE EPS	$ 0.78	$ 1.25

Earnings Per Share Antidilutive

Earnings Per Share Antidilutive Securities excluded from the Computaion of Earnings Per Share (Details) - shares	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Share-based Payment Arrangement, Option [Member]
Stock Option [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0	0
Performance Shares [Member]
Stock Option [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	5,431	6,890

Stock Based Compensation (Award

Stock Based Compensation (Awards of Restricted Stock) (Details) - Ratably Over Period [Member] - 2/27/2020 - Employee Stock [Member] - Restricted Stock [Member]	3 Months Ended
	Mar. 31, 2020$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares Granted | shares	46,550
Grant Date Fair Value Per Share | $ / shares	$ 70.24
Vesting Period	Ratably over 5 years from grant date

Stock Based Compensation Perfor

Stock Based Compensation Performance-based Restricted Stock Textual (Details) - Employee Stock Plan [Member]	3 Months Ended
	Mar. 31, 2020$ / sharesshares
Share-based Payment Arrangement, Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	0
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted	17,100
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares	$ 70.24
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	100.00%
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	14,400

Stock Based Compensation Stock

Stock Based Compensation Stock Based Compensation Option Awards Granted (Details) shares in Thousands	3 Months Ended
	Mar. 31, 2020shares
Employee Stock Plan [Member] | Share-based Payment Arrangement, Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	0

Derivatives and Hedging Activ_3

Derivatives and Hedging Activities (Derivative Positions for Interest Rate Swaps which Qualify as Hedges) (Details) - USD ($)		3 Months Ended		12 Months Ended
		Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019	Dec. 31, 2018
Details of derivative positions for interest rate swaps which qualify as hedges for accounting purposes
Amortization Of Deferred Hedge Gains Losses		$ 0
Change in Fair Value on Loans Held for Sale		(914,000)	$ 1,000		$ 1,000
Fair Value Hedges, Net		0		$ 0
Interest rate collars on loans [Member]
Details of derivative positions for interest rate swaps which qualify as hedges for accounting purposes
Derivative, Notional Amount		$ 400,000,000		$ 400,000,000
Derivative, Average Remaining Maturity		3 years 4 months 28 days		3 years 7 months 28 days
Derivative, Average Variable Interest Rate		0.81%		1.76%
Fair Value	[1]	$ 25,573,000		$ 9,896,000
Derivative, Average Cap Interest Rate		2.73%		3.02%
Derivative, Average Floor Interest Rate		2.20%		2.51%
Interest rate swaps on loans [Member]
Details of derivative positions for interest rate swaps which qualify as hedges for accounting purposes
Derivative, Notional Amount		$ 450,000,000		$ 450,000,000
Derivative, Average Remaining Maturity		3 years 4 months 28 days		3 years 7 months 28 days
Derivative, Average Variable Interest Rate		0.86%		1.76%
Derivative, Average Fixed Interest Rate		2.37%		2.37%
Fair Value	[1]	$ 31,701,000		$ 12,907,000
Interest rate swaps on borrowings [Member]
Details of derivative positions for interest rate swaps which qualify as hedges for accounting purposes
Derivative, Notional Amount		$ 175,000,000		$ 75,000,000
Derivative, Average Remaining Maturity		2 years 2 months 12 days		2 years 2 months 4 days
Derivative, Average Variable Interest Rate		1.28%		1.90%
Derivative, Average Fixed Interest Rate		0.94%		1.53%
Fair Value	[1]	$ (1,790,000)		$ 140,000
Interest rate swaps
Details of derivative positions for interest rate swaps which qualify as hedges for accounting purposes
Derivative, Notional Amount		1,025,000,000		925,000,000
Fair Value	[1]	$ 55,484,000		$ 22,943,000
[1]	Beginning in 2020, the Company made an election to include accrued interest within fair value balances.

Derivatives and Hedging Activ_4

Derivatives and Hedging Activities (Customer Related Derivative Positions - Not Designated as Hedges) (Details) - Not Designated as Hedging Instrument $ in Thousands		Mar. 31, 2020USD ($)position	Dec. 31, 2019USD ($)position
Receive fixed, pay variable | Loan level swaps
Summary of customer related derivative positions, not designated as hedging
Number of Positions | position	[1]	313	299
Less than 1 year		$ 155,318	$ 156,690
Less than 2 years		76,735	125,203
Less than 3 years		126,910	85,603
Less than 4 years		139,600	165,599
Thereafter		1,178,142	1,044,315
Derivative, Notional Amount		1,676,705	1,577,410
Fair Value	[2]	$ 143,707	$ 48,596
Pay fixed, receive variable | Loan level swaps
Summary of customer related derivative positions, not designated as hedging
Number of Positions | position	[1]	305	290
Less than 1 year		$ 158,692	$ 156,690
Less than 2 years		76,735	125,203
Less than 3 years		126,910	85,603
Less than 4 years		139,600	165,599
Thereafter		1,178,142	1,044,315
Derivative, Notional Amount		1,680,079	1,577,410
Fair Value	[2]	$ (143,726)	$ (48,591)
Buys foreign currency, sells U.S. currency | Foreign exchange contracts
Summary of customer related derivative positions, not designated as hedging
Number of Positions | position	[1]	47	40
Less than 1 year		$ 118,711	$ 91,434
Derivative, Notional Amount		118,711	91,434
Fair Value	[2]	$ (1,439)	$ (81)
Buys U.S. currency, sells foreign currency | Foreign exchange contracts
Summary of customer related derivative positions, not designated as hedging
Number of Positions | position	[1]	47	40
Less than 1 year		$ 118,711	$ 91,434
Derivative, Notional Amount		118,711	91,434
Fair Value	[2]	$ 1,499	$ 123
[1]	The Company may enter into one dealer swap agreement which offsets multiple commercial borrower swap agreements.
[2]	Beginning in 2020, the Company made an election to include accrued interest within fair value balances.

Derivatives and Hedging Activ_5

Derivatives and Hedging Activities (FV of Derivative Financial Instruments and Classification on Balance Sheet) (Details) - USD ($) $ in Thousands		Mar. 31, 2020	Dec. 31, 2019
Derivatives, Fair Value [Line Items]
Derivative Asset	[1]	$ 205,815	$ 78,385
Derivative Liability	[2]	136,515	53,923
Derivative Asset, Fair Value, Amount Offset Against Collateral	[1]	148,539	53,503
Derivative, Collateral, Obligation to Return Securities	[1],[3]	57,276	24,882
Derivative, Collateral, Right to Reclaim Securities	[2],[3]	57,276	24,882
Derivative, Collateral, Obligation to Return Cash	[1]	0	0
Derivative, Collateral, Right to Reclaim Cash	[2]	73,771	25,493
Derivative Liability, Fair Value, Amount Offset Against Collateral	[2]	5,468	3,548
Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	[1]	148,541	55,245
Derivative Asset, Fair Value, Gross Asset	[1]	205,815	78,385
Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value	[2]	147,749	53,726
Liability Derivatives	[2]	149,539	53,923
Interest rate swaps [Member] | Derivatives designated as hedges [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Interest Rate Derivative Assets, at Fair Value	[1],[4]	57,274	23,140
Interest rate swaps [Member] | Derivatives designated as hedges [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Interest Rate Derivative Liabilities, at Fair Value	[2],[5]	1,790	197
Loan level swaps [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	[1],[4]	143,763	52,374
Loan level swaps [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives	[2],[5]	143,782	52,369
Foreign exchange contracts | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	[1]	2,047	1,191
Foreign exchange contracts | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives	[2]	1,987	1,149
Interest Rate Lock Commitments [Member] | Not Designated as Hedging Instrument | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Instrument Not Designated as a Hedge, Interest Rate Lock Commitments, Asset at Fair Value	[1]	2,332	1,680
Derivative Instrument Not Designated as a Hedge, Forward Sales Agreements, Asset at Fair Value	[1]	399	0
Derivative Instrument Not Designated as a Hedge, Forward Sale Hedge Commitment, Asset at Fair Value	[1]	0	0
Interest Rate Lock Commitments [Member] | Not Designated as Hedging Instrument | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Instrument Not Designated as a Hedge, Interest Rate Lock Commitments, Liabilities at Fair Value	[2]	0	0
Derivative Instrument Not Designated as a Hedge, Forward Sales Agreements, Liabilities at Fair Value	[2]	0	12
Derivative Instrument Not Designated as a Hedge, Forward Sale Hedge Commitment, Liability at Fair Value	[2]	1,980	196
CME [Member]
Derivatives, Fair Value [Line Items]
Derivative, Collateral, Obligation to Return Cash	[1],[6]	0	0
Derivative, Collateral, Right to Reclaim Cash	[2],[6]	$ 13,024	$ 0
[1]	All asset derivatives are located in other assets on the balance sheet.
[2]	All liability derivatives are located in other liabilities on the balance sheet.
[3]	Reflects offsetting derivative positions with the same counterparty that are not netted on the balance sheet.
[4]	Approximately $574,000 and $1.1 million of accrued interest receivable is included in the fair value of the interest rate and loan level asset derivatives, respectively, as of March 31, 2020 . Accrued interest receivable of approximately and $350,000 and $569,000 was excluded from the fair value of the interest rate and loan level asset derivatives, respectively, as of December 31, 2019
[5]	Approximately $14,000 and $1.1 million of accrued interest payable is included in the fair value of the interest rate and loan level derivative liabilities, respectively, as of March 31, 2020 . Accrued interest payable of approximately $4,000 and $569,000 was excluded from the fair value of the interest rate and loan level derivative liabilities, respectively, as of December 31, 2019
[6]	Netting adjustments represent the amounts recorded to convert derivative assets and liabilities cleared through CME from a gross basis to a net basis, inclusive of the variation margin payments, in accordance with applicable accounting guidance. All derivatives that cleared through the CME were in a net liability position as of March 31, 2020 .

Derivatives and Hedging Activ_6

Derivatives and Hedging Activities (Derivative Financial Instruments included in OCI and Current Earnings) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Loss on Termination of Derivatives, before Tax	$ 0	$ 0
Derivatives designated as hedges [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Excluded Component, Gain (Loss), Recognized in Earnings	0	0
Gain reclassified from OCI into interest income or interest expense (effective portion)	1,586	424
Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Other income	(723)	71
Interest Expense [Member] | Derivatives designated as hedges [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Excluded Component, Gain (Loss), Recognized in Earnings	0	0
Other expense | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Other income	22	13
Changes in fair value of mortgage derivatives | Derivatives designated as hedges [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Excluded Component, Gain (Loss), Recognized in Earnings	0	0
Changes in fair value of mortgage derivatives | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Other income	(24)	(1)
Total | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Mortgage banking income (expense)	(721)	59
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	$ 22,984	$ 3,285

Derivatives and Hedging Activ_7

Derivatives and Hedging Activities (Textual) (Details) - USD ($)		3 Months Ended		12 Months Ended
		Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2018	Dec. 31, 2019
Derivative [Line Items]
Interest Receivable		$ 25,900,000
Derivative, Net Liability Position, Aggregate Fair Value		$ 88,300,000			$ 26,000,000
Maximum Length of Time Hedged in Interest Rate Cash Flow Hedge		4 years 7 months 6 days
Gain (Loss) on Sales of Loans, Net		$ 4,500,000	$ 705,000
Exposure to Institutional Counterparties		57,300,000			25,400,000
Amortization Of Deferred Hedge Gains Losses		0
Customer related positions		143,700,000			51,000,000
Fair Value Hedges, Net		0			0
Change in Fair Value on Loans Held for Sale		(914,000)	$ 1,000	$ 1,000
Interest rate swaps
Derivative [Line Items]
Interest Receivable	[1],[2]	574,000			350,000
Derivative, Notional Amount		1,025,000,000			925,000,000
Interest Payable, Current	[1],[2]	$ 14,000			$ 4,000
Interest rate collars on loans [Member]
Derivative [Line Items]
Derivative, Average Cap Interest Rate		2.73%			3.02%
Derivative, Average Floor Interest Rate		2.20%			2.51%
Derivative, Notional Amount		$ 400,000,000			$ 400,000,000
Loan level swaps
Derivative [Line Items]
Interest Receivable	[1],[2]	1,100,000			569,000
Interest Payable, Current	[1],[2]	1,100,000			$ 569,000
Interest Income [Member]
Derivative [Line Items]
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months		(16,800,000)
Interest Expense [Member]
Derivative [Line Items]
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months		$ 587,000
[1]	All asset derivatives are located in other assets on the balance sheet.
[2]	Approximately $574,000 and $1.1 million of accrued interest receivable is included in the fair value of the interest rate and loan level asset derivatives, respectively, as of March 31, 2020 . Accrued interest receivable of approximately and $350,000 and $569,000 was excluded from the fair value of the interest rate and loan level asset derivatives, respectively, as of December 31, 2019

Income Taxes Tax Provision and

Income Taxes Tax Provision and Applicable Rates (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Tax provision and applicable tax rates [Line Items]
Current Federal, State and Local, Tax Expense (Benefit)	$ 2,148	$ 11,522
Effective Income Tax Rate Reconciliation, Percent	7.43%
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent		24.65%

Income Taxes Textual (Details)

Income Taxes Textual (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Income Tax Disclosure [Abstract]
Current Federal, State and Local, Tax Expense (Benefit)	$ 2,148	$ 11,522
Other Tax Expense (Benefit)	$ 4,700

Fair Value Measurements (Detail

Fair Value Measurements (Details) - USD ($) $ in Thousands		Mar. 31, 2020	Dec. 31, 2019
ASSETS
Trading		$ 2,247	$ 2,179
Equity Securities, FV-NI		19,439	21,261
Debt Securities, Available-for-sale		437,296	426,424
U.S. government agency securities
ASSETS
Debt Securities, Available-for-sale		24,292	33,115
Agency mortgage-backed securities
ASSETS
Debt Securities, Available-for-sale		258,784	247,000
Pooled trust preferred securities issued by banks and insurers
ASSETS
Debt Securities, Available-for-sale		1,009	1,114
Small Business Administration Pooled Securities [Member]
ASSETS
Debt Securities, Available-for-sale		64,421	54,795
Recurring fair value measurements
ASSETS
Trading		2,247	2,179
LIABILITIES
TOTAL RECURRING FAIR VALUE MEASUREMENTS		559,014	507,633
Recurring fair value measurements | Equity Securities [Member]
ASSETS
Equity Securities, FV-NI		19,439	21,261
Recurring fair value measurements | U.S. government agency securities
ASSETS
Debt Securities, Available-for-sale		24,292	33,115
Recurring fair value measurements | Agency mortgage-backed securities
ASSETS
Debt Securities, Available-for-sale		258,784	247,000
Recurring fair value measurements | Agency collateralized mortgage obligations
ASSETS
Debt Securities, Available-for-sale		87,210	88,511
Recurring fair value measurements | Municipal Bonds [Member]
ASSETS
Debt Securities, Available-for-sale		1,144	1,396
Recurring fair value measurements | Single issuer trust preferred securities issued by banks and insurers
ASSETS
Debt Securities, Available-for-sale		436	493
Recurring fair value measurements | Pooled trust preferred securities issued by banks and insurers
ASSETS
Debt Securities, Available-for-sale		1,009	1,114
Recurring fair value measurements | Small Business Administration Pooled Securities [Member]
ASSETS
Debt Securities, Available-for-sale		64,421	54,795
Recurring fair value measurements | Loans held for sale
ASSETS
Loans Held-for-sale, Fair Value Disclosure		43,756	33,307
Recurring fair value measurements | Derivative Financial Instruments, Assets [Member]
ASSETS
Derivative Asset, Fair Value, Gross Asset		205,815	78,385
Recurring fair value measurements | Derivative instruments
LIABILITIES
Financial and Nonfinancial Liabilities, Fair Value Disclosure		149,539	53,923
Nonrecurring fair value measurements
LIABILITIES
TOTAL NONRECURRING FAIR VALUE MEASUREMENTS		39,444	25,515
Nonrecurring fair value measurements | Individually assessed collateral dependent loans
ASSETS
Assets, Fair Value Disclosure			25,515
Nonrecurring fair value measurements | Collateral Dependent Loans [Member]
ASSETS
Assets, Fair Value Disclosure		39,444
Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring fair value measurements
ASSETS
Trading		2,247	2,179
LIABILITIES
TOTAL RECURRING FAIR VALUE MEASUREMENTS		21,686	23,440
Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring fair value measurements | Equity Securities [Member]
ASSETS
Equity Securities, FV-NI		19,439	21,261
Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring fair value measurements | Municipal Bonds [Member]
ASSETS
Debt Securities, Available-for-sale			0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring fair value measurements | Small Business Administration Pooled Securities [Member]
ASSETS
Debt Securities, Available-for-sale		0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Nonrecurring fair value measurements
LIABILITIES
TOTAL NONRECURRING FAIR VALUE MEASUREMENTS		0	0
Significant Other Observable Inputs (Level 2) | Recurring fair value measurements
LIABILITIES
TOTAL RECURRING FAIR VALUE MEASUREMENTS		536,319	483,079
Significant Other Observable Inputs (Level 2) | Recurring fair value measurements | Equity Securities [Member]
ASSETS
Equity Securities, FV-NI		0	0
Significant Other Observable Inputs (Level 2) | Recurring fair value measurements | U.S. government agency securities
ASSETS
Debt Securities, Available-for-sale		24,292	33,115
Significant Other Observable Inputs (Level 2) | Recurring fair value measurements | Agency mortgage-backed securities
ASSETS
Debt Securities, Available-for-sale		258,784	247,000
Significant Other Observable Inputs (Level 2) | Recurring fair value measurements | Agency collateralized mortgage obligations
ASSETS
Debt Securities, Available-for-sale		87,210	88,511
Significant Other Observable Inputs (Level 2) | Recurring fair value measurements | Municipal Bonds [Member]
ASSETS
Debt Securities, Available-for-sale		1,144	1,396
Significant Other Observable Inputs (Level 2) | Recurring fair value measurements | Single issuer trust preferred securities issued by banks and insurers
ASSETS
Debt Securities, Available-for-sale		436	493
Significant Other Observable Inputs (Level 2) | Recurring fair value measurements | Small Business Administration Pooled Securities [Member]
ASSETS
Debt Securities, Available-for-sale		64,421	54,795
Significant Other Observable Inputs (Level 2) | Recurring fair value measurements | Loans held for sale
ASSETS
Loans Held-for-sale, Fair Value Disclosure		43,756	33,307
Significant Other Observable Inputs (Level 2) | Recurring fair value measurements | Derivative Financial Instruments, Assets [Member]
ASSETS
Derivative Asset, Fair Value, Gross Asset		205,815	78,385
Significant Other Observable Inputs (Level 2) | Recurring fair value measurements | Derivative instruments
LIABILITIES
Financial and Nonfinancial Liabilities, Fair Value Disclosure		149,539	53,923
Significant Other Observable Inputs (Level 2) | Nonrecurring fair value measurements
LIABILITIES
TOTAL NONRECURRING FAIR VALUE MEASUREMENTS		0	0
Significant Unobservable Inputs (Level 3) | Recurring fair value measurements
LIABILITIES
TOTAL RECURRING FAIR VALUE MEASUREMENTS		1,009	1,114
Significant Unobservable Inputs (Level 3) | Recurring fair value measurements | Equity Securities [Member]
ASSETS
Equity Securities, FV-NI		0	0
Significant Unobservable Inputs (Level 3) | Recurring fair value measurements | Municipal Bonds [Member]
ASSETS
Debt Securities, Available-for-sale			0
Significant Unobservable Inputs (Level 3) | Recurring fair value measurements | Pooled trust preferred securities issued by banks and insurers
ASSETS
Debt Securities, Available-for-sale		1,009	1,114
Significant Unobservable Inputs (Level 3) | Recurring fair value measurements | Small Business Administration Pooled Securities [Member]
ASSETS
Debt Securities, Available-for-sale		0	0
Significant Unobservable Inputs (Level 3) | Nonrecurring fair value measurements
LIABILITIES
TOTAL NONRECURRING FAIR VALUE MEASUREMENTS		39,444	25,515
Significant Unobservable Inputs (Level 3) | Nonrecurring fair value measurements | Individually assessed collateral dependent loans
ASSETS
Assets, Fair Value Disclosure			$ 25,515
Significant Unobservable Inputs (Level 3) | Nonrecurring fair value measurements | Collateral Dependent Loans [Member]
ASSETS
Assets, Fair Value Disclosure	[1]	$ 39,444
[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.

Fair Value Measurements (Deta_2

Fair Value Measurements (Details 1) - Pooled trust preferred securities - Significant Unobservable Inputs (Level 3) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	$ 0	$ 0
Reconciliation for all assets and liabilities measured at fair value on a recurring basis
Beginning Balance	1,114	1,329
Included in Other Comprehensive Income	(60)	3
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, (Sales), Issuances, (Settlements)	(45)	(18)
Ending Balance	$ 1,009	$ 1,314

Fair Value Measurements (Deta_3

Fair Value Measurements (Details 2) $ in Thousands		3 Months Ended	12 Months Ended
		Mar. 31, 2020USD ($)	Dec. 31, 2019USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt Securities, Available-for-sale		$ 437,296	$ 426,424
Discounted cash flow methodology [Member] | Significant Unobservable Inputs (Level 3) | Weighted Average [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Cumulative Default		13.50%	13.50%
Loss Given Default		93.60%	93.60%
Cure Given Default		60.90%	60.90%
Pooled trust preferred securities | Significant Unobservable Inputs (Level 3)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt Securities, Available-for-sale		$ 1,009	$ 1,114
Pooled trust preferred securities | Discounted cash flow methodology [Member] | Significant Unobservable Inputs (Level 3) | Minimum [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Cumulative Default		4.00%	2.00%
Loss Given Default		85.00%	85.00%
Cure Given Default		0.00%	0.00%
Pooled trust preferred securities | Discounted cash flow methodology [Member] | Significant Unobservable Inputs (Level 3) | Maximum [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Cumulative Default		100.00%	100.00%
Loss Given Default		100.00%	100.00%
Cure Given Default		75.00%	75.00%
Fair Value, Nonrecurring [Member] | Collateral Dependent Loans [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Assets, Fair Value Disclosure		$ 39,444
Fair Value, Nonrecurring [Member] | Collateral Dependent Loans [Member] | Significant Unobservable Inputs (Level 3)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Assets, Fair Value Disclosure	[1]	$ 39,444
Fair Value, Nonrecurring [Member] | COLLATERAL DEPENDENT IMPAIRED LOANS [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Assets, Fair Value Disclosure			$ 25,515
Fair Value, Nonrecurring [Member] | COLLATERAL DEPENDENT IMPAIRED LOANS [Member] | Significant Unobservable Inputs (Level 3)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Assets, Fair Value Disclosure			$ 25,515
Measurement Input, Constant Prepayment Rate [Member] | Discounted cash flow methodology [Member] | Significant Unobservable Inputs (Level 3) | Weighted Average [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt Securities, Available-for-sale, Measurement Input		0.024	0.026
Measurement Input, Constant Prepayment Rate [Member] | Pooled trust preferred securities | Discounted cash flow methodology [Member] | Significant Unobservable Inputs (Level 3) | Minimum [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt Securities, Available-for-sale, Measurement Input		0	0
Measurement Input, Constant Prepayment Rate [Member] | Pooled trust preferred securities | Discounted cash flow methodology [Member] | Significant Unobservable Inputs (Level 3) | Maximum [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt Securities, Available-for-sale, Measurement Input		0.57	0.57
[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.

Fair Value Measurements (Deta_4

Fair Value Measurements (Details 3) - USD ($) $ in Thousands		Mar. 31, 2020	Dec. 31, 2019
ASSETS
Debt Securities, Held-to-maturity		$ 777,798	$ 740,806
Held to Maturity, Fair Value, Total		809,355	753,263
Loans, net of allowance for credit losses(b)		8,824,054	8,805,899
Federal Home Loan Bank Stock		23,274	14,424
Bank Owned Life Insurance		197,772	197,372
LIABILITIES
Federal Home Loan Bank borrowings(f)		358,591	115,748
Long-term Debt	[1]	74,920	74,906
Long-term Debt, Fair Value	[1]	73,572	72,219
Subordinated Debt		49,625	49,601
Deposits [Member]
LIABILITIES
Time certificates of deposits(f)	[2]	8,146,490	7,752,052
Accrued Liabilities, Fair Value Disclosure	[2]	8,146,490	7,752,052
Time certificates of deposits(f)
LIABILITIES
Time certificates of deposits(f)	[1]	1,269,708	1,395,315
Accrued Liabilities, Fair Value Disclosure	[1]	1,279,983	1,396,760
Federal Home Loan Bank borrowings(f)
LIABILITIES
Federal Home Loan Bank borrowings(f)	[1]	358,591	115,748
Federal Home Loan Bank Borrowings, Fair Value Disclosure	[1]	359,249	115,881
Junior subordinated debentures(g)
LIABILITIES
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust	[3]	62,849	62,848
Accrued Liabilities, Fair Value Disclosure	[3]	61,528	65,603
Subordinated debentures(f)
LIABILITIES
Subordinated Debt	[1]	49,625	49,601
Accrued Liabilities, Fair Value Disclosure	[1]	51,896	52,870
Quoted Prices in Active Markets for Identical Assets (Level 1) | Long-term Debt [Member]
LIABILITIES
Long-term Debt, Fair Value	[1]	0	0
Significant Other Observable Inputs (Level 2) | Deposits [Member]
LIABILITIES
Accrued Liabilities, Fair Value Disclosure	[2]	8,146,490	7,752,052
Significant Other Observable Inputs (Level 2) | Time certificates of deposits(f)
LIABILITIES
Accrued Liabilities, Fair Value Disclosure	[1]	1,279,983	1,396,760
Significant Other Observable Inputs (Level 2) | Federal Home Loan Bank borrowings(f)
LIABILITIES
Federal Home Loan Bank Borrowings, Fair Value Disclosure	[1]	359,249
Accrued Liabilities, Fair Value Disclosure	[1]		115,881
Significant Other Observable Inputs (Level 2) | Long-term Debt [Member]
LIABILITIES
Long-term Debt, Fair Value	[1]	73,572	72,219
Significant Other Observable Inputs (Level 2) | Junior subordinated debentures(g)
LIABILITIES
Accrued Liabilities, Fair Value Disclosure	[3]	61,528	65,603
Significant Unobservable Inputs (Level 3) | Long-term Debt [Member]
LIABILITIES
Long-term Debt, Fair Value	[1]	0	0
Significant Unobservable Inputs (Level 3) | Subordinated debentures(f)
LIABILITIES
Accrued Liabilities, Fair Value Disclosure	[1]	51,896	52,870
U.S. Government agency securities
ASSETS
Debt Securities, Held-to-maturity	[4]		12,874
Held to Maturity, Fair Value, Total	[4]		12,997
U.S. Government agency securities | Significant Other Observable Inputs (Level 2)
ASSETS
Held to Maturity, Fair Value, Total	[4]		12,997
U.S. Treasury securities
ASSETS
Debt Securities, Held-to-maturity	[4]	4,029	4,032
Held to Maturity, Fair Value, Total	[4]	4,139	4,053
U.S. Treasury securities | Significant Other Observable Inputs (Level 2)
ASSETS
Held to Maturity, Fair Value, Total	[4]	4,139	4,053
Agency mortgage-backed securities
ASSETS
Debt Securities, Held-to-maturity	[4]	463,632	397,414
Held to Maturity, Fair Value, Total	[4]	482,363	405,802
Agency mortgage-backed securities | Significant Other Observable Inputs (Level 2)
ASSETS
Held to Maturity, Fair Value, Total	[4]	482,363	405,802
Agency collateralized mortgage obligations
ASSETS
Debt Securities, Held-to-maturity	[4]	277,921	293,662
Held to Maturity, Fair Value, Total	[4]	289,902	297,314
Agency collateralized mortgage obligations | Significant Other Observable Inputs (Level 2)
ASSETS
Held to Maturity, Fair Value, Total	[4]	289,902	297,314
Single issuer trust preferred securities issued by banks
ASSETS
Debt Securities, Held-to-maturity	[4]	1,500	1,500
Held to Maturity, Fair Value, Total	[4]	1,490	1,490
Single issuer trust preferred securities issued by banks | Significant Other Observable Inputs (Level 2)
ASSETS
Held to Maturity, Fair Value, Total	[4]	1,490	1,490
Small Business Administration Pooled Securities [Member]
ASSETS
Debt Securities, Held-to-maturity	[4]	30,716	31,324
Held to Maturity, Fair Value, Total	[4]	31,461	31,607
Small Business Administration Pooled Securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1)
ASSETS
Held to Maturity, Fair Value, Total	[4]	0	0
Small Business Administration Pooled Securities [Member] | Significant Other Observable Inputs (Level 2)
ASSETS
Held to Maturity, Fair Value, Total	[4]	31,461	31,607
Small Business Administration Pooled Securities [Member] | Significant Unobservable Inputs (Level 3)
ASSETS
Held to Maturity, Fair Value, Total	[4]	0	0
Loans, net of allowance for credit losses(b)
ASSETS
Loans, net of allowance for credit losses(b)	[5]	8,784,610	8,780,384
Loans Receivable, Fair Value Disclosure	[5]	8,626,697	8,613,635
Loans, net of allowance for credit losses(b) | Significant Unobservable Inputs (Level 3)
ASSETS
Loans Receivable, Fair Value Disclosure	[5]	8,626,697	8,613,635
Investment in Federal Home Loan Bank Stock [Member]
ASSETS
Federal Home Loan Bank Stock	[6]	23,274	14,424
Investment in Federal Home Loan Bank Stock, Fair Value Disclosure	[6]	23,274	14,424
Investment in Federal Home Loan Bank Stock [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1)
ASSETS
Investment in Federal Home Loan Bank Stock, Fair Value Disclosure	[6]	0	0
Investment in Federal Home Loan Bank Stock [Member] | Significant Other Observable Inputs (Level 2)
ASSETS
Investment in Federal Home Loan Bank Stock, Fair Value Disclosure	[6]	23,274	14,424
Investment in Federal Home Loan Bank Stock [Member] | Significant Unobservable Inputs (Level 3)
ASSETS
Investment in Federal Home Loan Bank Stock, Fair Value Disclosure	[6]	0	0
Cash Surrender Value [Member]
ASSETS
Cash Surrender Value, Fair Value Disclosure	[7]	197,772	197,372
Bank Owned Life Insurance	[7]	197,772	197,372
Cash Surrender Value [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1)
ASSETS
Cash Surrender Value, Fair Value Disclosure	[7]	0	0
Cash Surrender Value [Member] | Significant Other Observable Inputs (Level 2)
ASSETS
Cash Surrender Value, Fair Value Disclosure	[7]	197,772	197,372
Cash Surrender Value [Member] | Significant Unobservable Inputs (Level 3)
ASSETS
Cash Surrender Value, Fair Value Disclosure	[7]	$ 0	$ 0
[1]	Fair value was determined by discounting anticipated future cash payments using rates currently available for instruments with similar remaining maturities.
[2]	Fair value of demand deposits, savings and interest checking accounts and money market deposits is the amount payable on demand at the reporting date.
[3]	Fair value was determined based upon market prices of securities with similar terms and maturities.
[4]	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.
[5]	Fair value of loans is measured using the exit price valuation method, determined primarily 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, while incorporating liquidity and credit assumptions. Additionally, this amount excludes collateral dependent impaired loans, which are deemed to be marked to fair value on a nonrecurring basis.
[6]	FHLB stock has no quoted market value and is carried at cost, therefore the carrying amount approximates fair value.
[7]	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.

Revenue Recognition Disaggregat

Revenue Recognition Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Disaggregation of Revenue [Line Items]
Other noninterest income - ASC 606	$ 1,212	$ 939
Total noninterest income in scope of ASC 606	18,330	16,774
Total noninterest income out of scope of ASC 606	8,105	4,759
Noninterest Income	26,435	21,533
Deposit Account [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	4,970	4,406
Credit Card, Merchant Discount [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	4,104	3,735
ATM Charge [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	639	666
Investment Advisory, Management and Administrative Service [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	6,289	6,069
Investment Advisory, Retail Investment and Insurance Service [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	540	679
Merchant Processing [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	393	280
Credit Card Income [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 183	$ 0

Revenue Recognition Contract wi

Revenue Recognition Contract with Customer, Asset (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Revenue from Contract with Customer [Abstract]
Investment Management Income Receivable	$ 1,912	$ 2,341

Comprehensive Income_Loss (Comp

Comprehensive Income/Loss (Comprehensive Income/(Loss) Presented Net of Taxes) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Equity [Abstract]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax		$ 31,981	$ 4,572
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), after Adjustments, Tax		(8,997)	(1,287)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax		22,984	3,285
COMPREHENSIVE INCOME
Change in fair value of securities available for sale, pre tax amount		12,123	6,178
Change in fair value of securities available for sale, tax (expense) benefit		(2,776)	(1,449)
Change in fair value of securities available for sale, after tax amount		9,347	4,729
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax		0	0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax		0	0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax		0	0
Change in fair value of securities available for sale, pre tax amount		12,123	6,178
Change in fair value of securities available for sale, tax (expense) benefit		(2,776)	(1,449)
Change in fair value of securities available for sale, after tax amount		9,347	4,729
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax		33,567	4,996
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), before Adjustments, Tax		(9,443)	(1,406)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax		24,124	3,590
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax		1,586	424
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), Adjustments, Tax		(446)	(119)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax		1,140	305
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax		(1,389)	(11)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, Tax		391	3
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax		(998)	(8)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax		245	(2)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, Tax		(69)	1
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax		176	(1)
Amortization of certain costs included in net periodic retirement costs, pre tax amount		69	69
Amortization of certain costs included in net periodic retirement costs, tax (expense) benefit		(19)	(20)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, after Tax		50	49
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax	[1]	(1,075)	56
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax	[1]	303	(16)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	[1]	(772)	40
Total other comprehensive income, pre tax amount		43,029	10,806
Total other comprehensive income, tax (expense) benefit		(11,470)	(2,752)
Total other comprehensive income, after tax amount		$ 31,559	$ 8,054
[1]	The amortization of prior service costs is included in the computation of net periodic pension cost as disclosed in the Employee Benefit Plans footnote in the Company's Annual Report on Form 10-K for the year ended December 31, 2019 , filed with the Securities and Exchange Commission.

Comprehensive Income_Loss (Co_2

Comprehensive Income/Loss (Comprised of the following Components) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ 18,169	$ (1,173)
Net change in other comprehensive income (loss)	31,559	8,054
Ending Balance	49,728	6,881
Unrealized Gain (Loss) on Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	4,398	(5,947)
Net change in other comprehensive income (loss)	9,347	4,729
Ending Balance	13,745	(1,218)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	16,479	6,148
Net change in other comprehensive income (loss)	22,984	3,285
Ending Balance	39,463	9,433
Defined Benefit Postretirement Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(2,708)	(1,374)
Net change in other comprehensive income (loss)	(772)	40
Ending Balance	(3,480)	(1,334)
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net change in other comprehensive income (loss)	$ 31,559	$ 8,054

Commitments and contingencies F

Commitments and contingencies Financial Instruments with Off-Balance Sheet Risk (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Commitments to Extend Credit [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability	$ 3,296,926	$ 3,337,930
Standby Letters of Credit [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability	20,100	21,565
Deferred standby letter of credit fees [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability	166	158
Obligation to Repurchase Receivables Sold [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability	$ 426,342	$ 404,532

Commitments and contingencies T

Commitments and contingencies Textual (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Cash Reserve Deposit Required and Made	$ 0	$ 0
Minimum [Member]
Lessee, Operating Lease, Renewal Term	1 year
Maximum [Member]
Lessee, Operating Lease, Renewal Term	10 years

Investments is Low Income Hou_3

Investments is Low Income Housing Tax Credits Investments in Qualified Affordable Housing Projects (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2020		Dec. 31, 2019
Investments in Affordable Housing Projects [Abstract]
Original investment value	$ 110,669		$ 96,275
Amortization Method Qualified Affordable Housing Project Investments	84,679		72,510
Capital commitment relating to low income housing project investments	43,427		34,967
Tax credits and benefits	11,194	[1]	7,342
Amortization of investments	9,211	[2]	5,645
Net income tax benefit	$ 1,983	[3]	$ 1,696
[1]	(1) This amount reflects anticipated tax credits and tax benefits for the full year ended December 31, 2020 .
[2]	(2) The amortization amount reduces the tax credits and benefits anticipated for the full year ended December 31, 2020 .
[3]	(3) This amount represents the net tax benefit expected to be realized for the full year ended December 31, 2020 in determining the Company's effective tax rate.

Subsequent Events Loan Modifica

Subsequent Events Loan Modifications (Details)	3 Months Ended
	Mar. 31, 2020USD ($)contract	Mar. 31, 2019contract
Subsequent Event [Line Items]
In process PPP Loans	$ 818,900,000
Number of loan modification requests	1,941
Financing Receivable, Modifications, Number of Contracts | contract	5	2
Number of Loan Modification Requests as a percent of Total Loans	4.38%
Amount of Loan Modification Requests	$ 1,421,908
Loan Modification Requests as a Percent of Total Loans	15.95%
Average PPP Loan Balance	$ 160,000
Median PPP Loan Balance	41,000
Process fee income PPP Loans	$ 25,900,000
Commercial And Industrial [Member]
Subsequent Event [Line Items]
Number of loan modification requests	308
Financing Receivable, Modifications, Number of Contracts | contract	2
Number of Loan Modification Requests as a percent of Total Loans	0.69%
Amount of Loan Modification Requests	$ 163,889
Loan Modification Requests as a Percent of Total Loans	1.84%
Commercial Real Estate Portfolio Segment [Member]
Subsequent Event [Line Items]
Number of loan modification requests	557
Number of Loan Modification Requests as a percent of Total Loans	1.27%
Amount of Loan Modification Requests	$ 967,643
Loan Modification Requests as a Percent of Total Loans	10.86%
Construction [Member]
Subsequent Event [Line Items]
Number of loan modification requests	19
Number of Loan Modification Requests as a percent of Total Loans	0.04%
Amount of Loan Modification Requests	$ 37,811
Loan Modification Requests as a Percent of Total Loans	0.42%
Small Business [Member]
Subsequent Event [Line Items]
Number of loan modification requests	289
Financing Receivable, Modifications, Number of Contracts | contract	1
Number of Loan Modification Requests as a percent of Total Loans	0.65%
Amount of Loan Modification Requests	$ 21,781
Loan Modification Requests as a Percent of Total Loans	0.24%
Residential Real Estate [Member]
Subsequent Event [Line Items]
Number of loan modification requests	438
Financing Receivable, Modifications, Number of Contracts | contract	1
Number of Loan Modification Requests as a percent of Total Loans	0.99%
Amount of Loan Modification Requests	$ 185,530
Loan Modification Requests as a Percent of Total Loans	2.08%
Home Equity Loan [Member]
Subsequent Event [Line Items]
Number of loan modification requests	308
Number of Loan Modification Requests as a percent of Total Loans	0.69%
Amount of Loan Modification Requests	$ 44,695
Loan Modification Requests as a Percent of Total Loans	0.50%
Consumer Portfolio Segment [Member]
Subsequent Event [Line Items]
Number of loan modification requests	22
Number of Loan Modification Requests as a percent of Total Loans	0.05%
Amount of Loan Modification Requests	$ 559
Loan Modification Requests as a Percent of Total Loans	0.01%

Uncategorized Items - indb03-31

Label	Element	Value	[1]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets	us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleCumulativeEffectOfChangeOnEquityOrNetAssets1	$ 1,553,000
Retained Earnings [Member]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets	us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleCumulativeEffectOfChangeOnEquityOrNetAssets1	$ 1,553,000
[1]	Represents adjustment needed to reflect the cumulative impact on retained earnings pursuant to the Company's adoption of Accounting Standards Update 2016-13. The adjustment presented includes $1.1 million ( $817,000 , net of tax) attributable to the change in accounting methodology for estimating the allowance for credit losses and $1.0 million ( $736,000 , net of tax) related to the reserve for unfunded commitments resulting from the Company's adoption of the standard. Amount shown in the table above is presented net of tax.