Glacier Bancorp (GBCI) 10-Q 2 Nov 17 2017 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2017	Oct. 16, 2017
Document and Entity Information [Abstract]
Entity Registrant Name	GLACIER BANCORP INC
Entity Central Index Key	868,671
Document Type	10-Q
Document Period End Date	Sep. 30, 2017
Amendment Flag	false
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q3
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		78,006,956

Unaudited Condensed Consolidate

Unaudited Condensed Consolidated Statements of Financial Condition - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Assets
Cash on hand and in banks	$ 136,822	$ 135,268
Federal Funds Sold	210	0
Interest bearing cash deposits	83,178	17,273
Cash and cash equivalents	220,210	152,541
Investment securities, available-for-sale	1,886,517	2,425,477
Investment securities, held-to-maturity	655,128	675,674
Total investment securities	2,541,645	3,101,151
Loans held for sale	48,709	72,927
Loans receivable	6,509,433	5,684,463
Allowance for loan and lease losses	(129,576)	(129,572)
Loans receivable, net	6,379,857	5,554,891
Premises and equipment, net	178,672	176,198
Other real estate owned	14,359	20,954
Accrued interest receivable	50,492	45,832
Deferred tax asset	58,916	67,121
Core deposit intangible, net	14,798	12,347
Goodwill	177,811	147,053
Non-marketable equity securities	21,890	25,550
Other assets	91,243	74,035
Total assets	9,798,602	9,450,600
Liabilities
Non-interest bearing deposits	2,355,983	2,041,852
Interest bearing deposits	5,411,171	5,330,427
Securities sold under agreements to repurchase	453,596	473,650
Federal Home Loan Bank advances	153,685	251,749
Other borrowed funds	8,243	4,440
Subordinated debentures	126,099	125,991
Accrued interest payable	3,154	3,584
Other liabilities	80,470	102,038
Total liabilities	8,592,401	8,333,731
Stockholders' Equity
Preferred shares, $0.01 par value per share, 1,000,000 shares authorized, none issued or outstanding	0	0
Common stock, $0.01 par value per share, 117,187,500 shares authorized	780	765
Paid-in capital	797,381	749,107
Retained earnings - substantially restricted	403,373	374,379
Accumulated other comprehensive income (loss)	4,667	(7,382)
Total stockholders' equity	1,206,201	1,116,869
Total liabilities and stockholders' equity	$ 9,798,602	$ 9,450,600
Number of common stock shares issued and outstanding	78,006,956	76,525,402

Unaudited Condensed Consolidat3

Unaudited Condensed Consolidated Statements of Financial Condition (Parenthetical) - $ / shares	Sep. 30, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Preferred shares, par value	$ 0.01	$ 0.01
Preferred shares, authorized	1,000,000	1,000,000
Preferred shares, issued	0	0
Preferred shares, outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	117,187,500	117,187,500

Unaudited Condensed Consolidat4

Unaudited Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Interest Income
Investment securities	$ 19,987	$ 21,827	$ 63,305	$ 68,747
Residential real estate loans	8,326	8,538	24,594	24,947
Commercial loans	59,875	47,694	166,027	139,199
Consumer and other loans	8,276	7,885	24,198	23,501
Total interest income	96,464	85,944	278,124	256,394
Interest Expense
Deposits	4,564	4,550	13,505	13,905
Securities sold under agreements to repurchase	537	289	1,362	882
Federal Home Loan Bank advances	1,398	1,527	4,642	4,844
Other borrowed funds	21	17	55	49
Subordinated debentures	1,132	935	3,228	2,737
Total interest expense	7,652	7,318	22,792	22,417
Net Interest Income	88,812	78,626	255,332	233,977
Provision for loan losses	3,327	626	7,938	1,194
Net interest income after provision for loan losses	85,485	78,000	247,394	232,783
Non-Interest Income
Service charges and other fees	17,307	16,307	50,435	46,760
Miscellaneous loan fees and charges	1,211	1,195	3,283	3,379
Gain on sale of loans	9,141	9,592	23,031	23,841
Gain (loss) on sale of investments	77	(594)	(545)	(706)
Other income	3,449	1,793	8,326	6,030
Total non-interest income	31,185	28,293	84,530	79,304
Non-Interest Expense
Compensation and employee benefits	41,297	38,370	120,041	112,871
Occupancy and equipment	6,500	6,168	19,706	19,287
Advertising and promotions	2,239	2,098	6,381	6,308
Data processing	3,647	3,982	10,180	10,982
Other real estate owned	817	215	1,532	819
Regulatory assessments and insurance	1,214	1,158	3,362	3,732
Core deposit intangibles amortization	640	777	1,880	2,362
Other expenses	12,198	12,412	34,123	35,636
Total non-interest expense	68,552	65,180	197,205	191,997
Income Before Income Taxes	48,118	41,113	134,719	120,090
Federal and state income tax expense	11,639	10,156	33,298	30,000
Net Income	$ 36,479	$ 30,957	$ 101,421	$ 90,090
Basic earnings per share	$ 0.47	$ 0.40	$ 1.31	$ 1.18
Diluted earnings per share	0.47	0.40	1.31	1.18
Dividends declared per share	$ 0.51	$ 0.20	$ 0.93	$ 0.60
Average outstanding shares - basic	78,004,450	76,288,640	77,379,514	76,195,550
Average outstanding shares - diluted	78,065,942	76,350,873	77,442,944	76,247,051

Unaudited Condensed Consolidat5

Unaudited Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 36,479	$ 30,957	$ 101,421	$ 90,090
Other Comprehensive (Loss) Income, Net of Tax
Unrealized (losses) gains on available-for-sale securities	(2,835)	(9,945)	17,172	30,614
Reclassification adjustment for (gains) losses included in net income	(77)	594	519	651
Net unrealized (losses) gains on available-for-sale securities	(2,912)	(9,351)	17,691	31,265
Tax effect	1,129	3,624	(6,853)	(12,111)
Net of tax amount	(1,783)	(5,727)	10,838	19,154
Unrealized gains (losses) on derivatives used for cash flow hedges	45	1,959	(1,799)	(11,989)
Reclassification adjustment for losses included in net income	1,182	1,555	3,776	4,962
Net unrealized gains (losses) on derivatives used for cash flow hedges	1,227	3,514	1,977	(7,027)
Tax effect	(476)	(1,362)	(766)	2,722
Net of tax amount	751	2,152	1,211	(4,305)
Total other comprehensive (loss) income, net of tax	(1,032)	(3,575)	12,049	14,849
Total Comprehensive Income	$ 35,447	$ 27,382	$ 113,470	$ 104,939

Unaudited Condensed Consolidat6

Unaudited Condensed Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Paid-in Capital	Retained Earnings Substantially Restricted	Accumulated Other Comprehensive Income (Loss)
Balance, beginning, shares at Dec. 31, 2015		76,086,288
Balance, beginning at Dec. 31, 2015	$ 1,076,650	$ 761	$ 736,368	$ 337,532	$ 1,989
Net income	90,090			90,090
Comprehensive income, accumulated other comprehensive income (loss)	14,849				14,849
Comprehensive income, total	104,939
Cash dividends declared	(45,909)			(45,909)
Stock issued in connection with acquisitions, shares		349,545
Stock issued in connection with acquisitions, amount	10,465	$ 3	10,462
Stock issuances under stock incentive plans, shares		89,569
Stock issuances under stock incentive plans, value	0	$ 1	(1)
Stock-based compensation and related taxes	1,634		1,634
Balance, ending, shares at Sep. 30, 2016		76,525,402
Balance, ending at Sep. 30, 2016	$ 1,147,779	$ 765	748,463	381,713	16,838
Balance, beginning, shares at Dec. 31, 2016	76,525,402	76,525,402
Balance, beginning at Dec. 31, 2016	$ 1,116,869	$ 765	749,107	374,379	(7,382)
Net income	101,421			101,421
Comprehensive income, accumulated other comprehensive income (loss)	12,049				12,049
Comprehensive income, total	113,470
Cash dividends declared	(72,427)			(72,427)
Stock issued in connection with acquisitions, shares		1,381,661
Stock issued in connection with acquisitions, amount	46,673	$ 14	46,659
Stock issuances under stock incentive plans, shares		99,893
Stock issuances under stock incentive plans, value	0	$ 1	(1)
Stock-based compensation and related taxes	$ 1,616		1,616
Balance, ending, shares at Sep. 30, 2017	78,006,956	78,006,956
Balance, ending at Sep. 30, 2017	$ 1,206,201	$ 780	$ 797,381	$ 403,373	$ 4,667

Unaudited Condensed Consolidat7

Unaudited Condensed Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - $ / shares	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash dividends declared per share	$ 0.93	$ 0.60
Retained Earnings Substantially Restricted
Cash dividends declared per share	$ 0.93	$ 0.60

Unaudited Condensed Consolidat8

Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Operating Activities
Net income	$ 101,421	$ 90,090
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	7,938	1,194
Net amortization of investment securities premiums and discounts	16,265	19,990
Net accretion of purchase accounting adjustments	(4,534)	(1,413)
Loans held for sale originated or acquired	(672,055)	(789,605)
Proceeds from sales of loans held for sale	730,082	816,236
Gain on sale of loans	(23,031)	(23,841)
Loss on sale of investments	545	706
Bank-owned life insurance income, net	(1,032)	(814)
Stock-based compensation	3,129	2,225
Net tax benefits from stock-based compensation	(1,680)	(793)
Depreciation of premises and equipment	10,989	11,440
Gain on sale of other real estate owned and write-downs, net	(1,808)	(103)
Amortization of core deposit intangibles	1,880	2,362
Amortization of investments in variable interest entities	3,581	1,745
Net increase in accrued interest receivable	(3,564)	(5,449)
Net decrease in other assets	6,147	5,820
Net decrease in accrued interest payable	(431)	(84)
Net increase (decrease) in other liabilities	4,609	(1,182)
Net cash provided by operating activities	178,451	128,524
Investing Activities
Sales of available-for-sale securities	247,748	20,539
Maturities, prepayments and calls of available-for-sale securities	347,450	527,596
Purchases of available-for-sale securities	(28,301)	(217,261)
Maturities, prepayments and calls of held-to-maturity securities	18,910	21,965
Purchases of held-to-maturity securities	0	(1,222)
Principal collected on loans	1,472,757	1,276,078
Loans originated or acquired	(2,022,508)	(1,755,185)
Net additions to premises and equipment	(7,682)	(6,893)
Proceeds from sale of other real estate owned	11,812	8,793
Proceeds from sale of non-marketable equity securities	47,805	69,607
Purchases of non-marketable equity securities	(42,598)	(61,999)
Proceeds from bank-owned life insurance	437	294
Investments in variable interest entities	(16,541)	(3,751)
Net cash (paid) received in acquisitions	(4,091)	6,701
Net cash provided by (used in) investing activities	25,198	(114,738)
Financing Activities
Net increase in deposits	98,013	305,035
Net decrease in securities sold under agreements to repurchase	(20,054)	(22,171)
Net decrease in short-term Federal Home Loan Bank advances	(62,800)	(140,000)
Proceeds from long-term Federal Home Loan Bank advances	150,000	0
Repayments of long-term Federal Home Loan Bank advances	(208,097)	(45,491)
Net increase in other borrowed funds	3,803	994
Cash dividends paid	(95,332)	(53,393)
Tax withholding payments for stock-based compensation	(1,513)	(600)
Net cash (used in) provided by financing activities	(135,980)	44,374
Net increase in cash and cash equivalents	67,669	58,160
Cash and cash equivalents at beginning of period	152,541	193,253
Cash and cash equivalents at end of period	220,210	251,413
Supplemental Disclosure of Cash Flow Information
Cash paid during the period for interest	23,223	22,506
Cash paid during the period for income taxes	29,315	25,254
Supplemental Disclosure of Non-Cash Investing Activities
Sale and refinancing of other real estate owned	531	611
Transfer of loans to other real estate owned	3,844	4,117
Dividends declared but not paid	232	15,409
Fair value of common stock shares issued	46,673	10,465
Cash consideration for outstanding shares	17,342	3,475
Fair Value of Assets Acquired	355,230	69,750
Liabilities Assumed	$ 321,824	$ 62,225

Nature of Operations and Summar

Nature of Operations and Summary of Significant Accounting Policies	9 Months Ended
	Sep. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Nature of Operations and Summary of Significant Accounting Policies	Nature of Operations and Summary of Significant Accounting Policies General Glacier Bancorp, Inc. (“Company”) is a Montana corporation headquartered in Kalispell, Montana. The Company provides a full range of banking services to individuals and businesses in Montana, Idaho, Utah, Washington, Wyoming, Colorado and Arizona through its wholly-owned bank subsidiary, Glacier Bank (“Bank”). The Company offers a wide range of banking products and services, including transaction and savings deposits, real estate, commercial, agriculture and consumer loans and mortgage origination services. The Company serves individuals, small to medium-sized businesses, community organizations and public entities. In the opinion of management, the accompanying unaudited condensed consolidated financial statements contain all adjustments (consisting of normal recurring adjustments) necessary for a fair presentation of the Company’s financial condition as of September 30, 2017 , the results of operations and comprehensive income for the three and nine month periods ended September 30, 2017 and 2016 , and changes in stockholders’ equity and cash flows for the nine month periods ended September 30, 2017 and 2016 . The condensed consolidated statement of financial condition of the Company as of December 31, 2016 has been derived from the audited consolidated statements of the Company as of that date. The accompanying unaudited condensed consolidated financial statements do not include all of the information and footnotes required by accounting principles generally accepted in the United States of America (“GAAP”) for complete financial statements. These unaudited condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and notes thereto contained in the Company’s Annual Report on Form 10-K for the year ended December 31, 2016 . Operating results for the nine months ended September 30, 2017 are not necessarily indicative of the results anticipated for the year ending December 31, 2017 . The Company is a defendant in legal proceedings arising in the normal course of business. In the opinion of management, the disposition of pending litigation will not have a material affect on the Company’s consolidated financial position, results of operations or liquidity. Material estimates that are particularly susceptible to significant change include: 1) the determination of the allowance for loan and lease losses (“ALLL” or “allowance”); 2) the valuation of investment securities; 3) the valuation of real estate acquired in connection with foreclosures or in satisfaction of loans; and 4) the evaluation of goodwill impairment. For the determination of the ALLL and real estate valuation estimates, management obtains independent appraisals (new or updated) for significant items. Estimates relating to investment valuations are obtained from independent third parties. Estimates relating to the evaluation of goodwill for impairment are determined based on internal calculations using significant independent party inputs. Principles of Consolidation The consolidated financial statements of the Company include the parent holding company and the Bank. The Bank consists of fourteen bank divisions, a treasury division, an information technology division and a centralized mortgage division. The treasury division includes the Bank’s investment portfolio and wholesale borrowings, the information technology division includes the Bank’s internal data processing, and the centralized mortgage division includes mortgage loan servicing and secondary market sales. The Bank divisions operate under separate names, management teams and advisory directors. The Company considers the Bank to be its sole operating segment as the Bank 1) engages in similar bank business activity from which it earns revenues and incurs expenses; 2) the operating results of the Bank are regularly reviewed by the Chief Executive Officer (i.e., the chief operating decision maker) who makes decisions about resources to be allocated to the Bank; and 3) financial information is available for the Bank. All significant inter-company transactions have been eliminated in consolidation. The Bank has subsidiary interests in variable interest entities (“VIE”) for which the Bank has both the power to direct the VIE’s significant activities and the obligation to absorb losses or right to receive benefits of the VIE that could potentially be significant to the VIE. These subsidiary interests are included in the Company’s consolidated financial statements. The parent holding company also owns non-bank subsidiaries that have issued trust preferred securities as Tier 1 capital instruments. The trust subsidiaries are not included in the Company’s consolidated financial statements. The Company's investments in the trust subsidiaries are included in non-marketable equity securities on the Company's statement of financial condition. In April 2017, the Company completed its acquisition of TFB Bancorp, Inc. and its wholly-owned subsidiary, The Foothills Bank, a community bank based in Yuma, Arizona (collectively, “Foothills”). In August 2016, the Company completed its acquisition of Treasure State Bank, a community bank based in Missoula, Montana. The transactions were accounted for using the acquisition method, and their results of operations have been included in the Company’s consolidated financial statements as of the acquisition dates. Pending Acquisition In June 2017, the Company announced the signing of a definitive agreement to acquire Columbine Capital Corp., and its wholly-owned subsidiary, Collegiate Peaks Bank, a community bank based in Buena Vista, Colorado (collectively, “Collegiate”). Collegiate provides banking services to businesses and individuals in the Mountain and Front Range communities of Colorado, with banking offices located in Aurora, Buena Vista, Denver and Salida. As of September 30, 2017, Collegiate had total assets of $536,387,000 , gross loans of $331,486,000 and total deposits of $460,380,000 . The acquisition is subject to required regulatory approvals and other customary conditions of closing and is expected to be completed during the first quarter of 2018. Upon closing of the transaction, Collegiate will be merged into Glacier Bank and will operate as a separate bank division under its existing name and management team. Loans Receivable Loans that are intended to be held-to-maturity are reported at the unpaid principal balance less net charge-offs and adjusted for deferred fees and costs on originated loans and unamortized premiums or discounts on acquired loans. Fees and costs on originated loans and premiums or discounts on acquired loans are deferred and subsequently amortized or accreted as a yield adjustment over the expected life of the loan utilizing the interest method. The objective of the interest method is to calculate periodic interest income at a constant effective yield. When a loan is paid off prior to maturity, the remaining fees and costs on originated loans and premiums or discounts on acquired loans are immediately recognized into interest income. The Company’s loan segments, which are based on the purpose of the loan, include residential real estate, commercial, and consumer loans. The Company’s loan classes, a further disaggregation of segments, include residential real estate loans (residential real estate segment), commercial real estate and other commercial loans (commercial segment), and home equity and other consumer loans (consumer segment). Loans that are thirty days or more past due based on payments received and applied to the loan are considered delinquent. Loans are designated non-accrual and the accrual of interest is discontinued when the collection of the contractual principal or interest is unlikely. A loan is typically placed on non-accrual when principal or interest is due and has remained unpaid for ninety days or more. When a loan is placed on non-accrual status, interest previously accrued but not collected is reversed against current period interest income. Subsequent payments on non-accrual loans are applied to the outstanding principal balance if doubt remains as to the ultimate collectability of the loan. Interest accruals are not resumed on partially charged-off impaired loans. For other loans on nonaccrual, interest accruals are resumed on such loans only when they are brought fully current with respect to interest and principal and when, in the judgment of management, the loans are estimated to be fully collectible as to both principal and interest. The Company considers impaired loans to be the primary credit quality indicator for monitoring the credit quality of the loan portfolio. Loans are designated impaired when, based upon current information and events, it is probable that the Company will be unable to collect the scheduled payments of principal or interest when due according to the contractual terms of the loan agreement and, therefore, the Company has serious doubts as to the ability of such borrowers to fulfill the contractual obligation. Impaired loans include non-performing loans (i.e., non-accrual loans and accruing loans ninety days or more past due) and accruing loans under ninety days past due where it is probable payments will not be received according to the loan agreement (e.g., troubled debt restructuring). Interest income on accruing impaired loans is recognized using the interest method. The Company measures impairment on a loan-by-loan basis in the same manner for each class within the loan portfolio. An insignificant delay or shortfall in the amounts of payments would not cause a loan or lease to be considered impaired. The Company determines the significance of payment delays and shortfalls on a case-by-case basis, taking into consideration all of the facts and circumstances surrounding the loan and the borrower, including the length and reasons for the delay, the borrower’s prior payment record, and the amount of the shortfall in relation to the principal and interest due. A restructured loan is considered a troubled debt restructuring (“TDR”) if the creditor, for economic or legal reasons related to the debtor’s financial difficulties, grants a concession to the debtor that it would not otherwise consider. The Company periodically enters into restructure agreements with borrowers whereby the loans were previously identified as TDRs. When such circumstances occur, the Company carefully evaluates the facts of the subsequent restructure to determine the appropriate accounting and under certain circumstances it may be acceptable not to account for the subsequently restructured loan as a TDR. When assessing whether a concession has been granted by the Company, any prior forgiveness on a cumulative basis is considered a continuing concession. A TDR loan is considered an impaired loan and a specific valuation allowance is established when the fair value of the collateral-dependent loan or present value of the loan’s expected future cash flows (discounted at the loan’s effective interest rate based on the original contractual rate) is lower than the carrying value of the impaired loan. The Company has made the following types of loan modifications, some of which were considered a TDR: • reduction of the stated interest rate for the remaining term of the debt; • extension of the maturity date(s) at a stated rate of interest lower than the current market rate for newly originated debt having similar risk characteristics; and • reduction of the face amount of the debt as stated in the debt agreements. The Company recognizes that while borrowers may experience deterioration in their financial condition, many continue to be creditworthy customers who have the willingness and capacity for debt repayment. In determining whether non-restructured or unimpaired loans issued to a single or related party group of borrowers should continue to accrue interest when the borrower has other loans that are impaired or are TDRs, the Company on a quarterly or more frequent basis performs an updated and comprehensive assessment of the willingness and capacity of the borrowers to timely and ultimately repay their total debt obligations, including contingent obligations. Such analysis takes into account current financial information about the borrowers and financially responsible guarantors, if any, including for example: • analysis of global, i.e., aggregate debt service for total debt obligations; • assessment of the value and security protection of collateral pledged using current market conditions and alternative market assumptions across a variety of potential future situations; and • loan structures and related covenants. For additional information relating to loans, see Note 3. Allowance for Loan and Lease Losses Based upon management’s analysis of the Company’s loan portfolio, the balance of the ALLL is an estimate of probable credit losses known and inherent within the Bank’s loan portfolio as of the date of the consolidated financial statements. The ALLL is analyzed at the loan class level and is maintained within a range of estimated losses. Determining the adequacy of the ALLL involves a high degree of judgment and is inevitably imprecise as the risk of loss is difficult to quantify. The determination of the ALLL and the related provision for loan losses is a critical accounting estimate that involves management’s judgments about known relevant internal and external environmental factors that affect loan losses. The balance of the ALLL is highly dependent upon management’s evaluations of borrowers’ current and prospective performance, appraisals and other variables affecting the quality of the loan portfolio. Individually significant loans and major lending areas are reviewed periodically to determine potential problems at an early date. Changes in management’s estimates and assumptions are reasonably possible and may have a material impact upon the Company’s consolidated financial statements, results of operations or capital. Risk characteristics considered in the ALLL analysis applicable to each loan class within the Company's loan portfolio are as follows: Residential Real Estate. Residential real estate loans are secured by owner-occupied 1-4 family residences. Repayment of these loans is primarily dependent on the personal income and credit rating of the borrowers. Credit risk in these loans is impacted by economic conditions within the Company’s market areas that affect the value of the property securing the loans and affect the borrowers' personal incomes. Mitigating risk factors for this loan class include a large number of borrowers, geographic dispersion of market areas and the loans are originated for relatively smaller amounts. Commercial Real Estate . Commercial real estate loans typically involve larger principal amounts, and repayment of these loans is generally dependent on the successful operation of the property securing the loan and/or the business conducted on the property securing the loan. Credit risk in these loans is impacted by the creditworthiness of a borrower, valuation of the property securing the loan and conditions within the local economies in the Company’s diverse, geographic market areas. Commercial . Commercial loans consist of loans to commercial customers for use in financing working capital needs, equipment purchases and business expansions. The loans in this category are repaid primarily from the cash flow of a borrower’s principal business operation. Credit risk in these loans is driven by creditworthiness of a borrower and the economic conditions that impact the cash flow stability from business operations across the Company’s diverse, geographic market areas. Home Equity . Home equity loans consist of junior lien mortgages and first and junior lien lines of credit (revolving open-end and amortizing closed-end) secured by owner-occupied 1-4 family residences. Repayment of these loans is primarily dependent on the personal income and credit rating of the borrowers. Credit risk in these loans is impacted by economic conditions within the Company’s market areas that affect the value of the residential property securing the loans and affect the borrowers' personal incomes. Mitigating risk factors for this loan class are a large number of borrowers, geographic dispersion of market areas and the loans are originated for terms that range from 10 to 15 years . Other Consumer . The other consumer loan portfolio consists of various short-term loans such as automobile loans and loans for other personal purposes. Repayment of these loans is primarily dependent on the personal income of the borrowers. Credit risk is driven by consumer economic factors (such as unemployment and general economic conditions in the Company’s diverse, geographic market area) and the creditworthiness of a borrower. The ALLL consists of a specific valuation allowance component and a general valuation allowance component. The specific component relates to loans that are determined to be impaired and individually evaluated for impairment. The Company measures impairment on a loan-by-loan basis based on the present value of expected future cash flows discounted at the loan’s effective interest rate, except when it is determined that repayment of the loan is expected to be provided solely by the underlying collateral. For impairment based on expected future cash flows, the Company considers all information available as of a measurement date, including past events, current conditions, potential prepayments, and estimated cost to sell when such costs are expected to reduce the cash flows available to repay or otherwise satisfy the loan. For alternative ranges of cash flows, the likelihood of the possible outcomes is considered in determining the best estimate of expected future cash flows. The effective interest rate for a loan restructured in a TDR is based on the original contractual rate. For collateral-dependent loans and real estate loans for which foreclosure or a deed-in-lieu of foreclosure is probable, impairment is measured by the fair value of the collateral, less estimated cost to sell. The fair value of the collateral is determined primarily based upon appraisal or evaluation of the underlying real property value. The general valuation allowance component relates to probable credit losses inherent in the balance of the loan portfolio based on historical loss experience, adjusted for changes in trends and conditions of qualitative or environmental factors. The historical loss experience is based on the previous twelve quarters loss experience by loan class adjusted for risk characteristics in the existing loan portfolio. The same trends and conditions are evaluated for each class within the loan portfolio; however, the risk characteristics are weighted separately at the individual class level based on the Company’s judgment and experience. The changes in trends and conditions evaluated for each class within the loan portfolio include the following: • Changes in lending policies and procedures, including changes in underwriting standards and collection, charge-off, and recovery practices not considered elsewhere in estimating credit losses; • Changes in global, national, regional, and local economic and business conditions and developments that affect the collectability of the portfolio, including the condition of various market segments; • Changes in the nature and volume of the portfolio and in the terms of loans; • Changes in experience, ability, and depth of lending management and other relevant staff; • Changes in the volume and severity of past due and nonaccrual loans; • Changes in the quality of the Company’s loan review system; • Changes in the value of underlying collateral for collateral-dependent loans; • The existence and effect of any concentrations of credit, and changes in the level of such concentrations; and • The effect of other external factors such as competition and legal and regulatory requirements on the level of estimated credit losses in the Company’s existing portfolio. The ALLL is increased by provisions for loan losses which are charged to expense. The portions of loan balances determined by management to be uncollectible are charged off as a reduction of the ALLL and recoveries of amounts previously charged off are credited as an increase to the ALLL. The Company’s charge-off policy is consistent with bank regulatory standards. Consumer loans generally are charged off when the loan becomes over 120 days delinquent. Real estate acquired as a result of foreclosure or by deed-in-lieu of foreclosure is classified as real estate owned until such time as it is sold. At acquisition date, the assets and liabilities of acquired banks are recorded at their estimated fair values which results in no ALLL carried over from acquired banks. Subsequent to acquisition, an allowance will be recorded on the acquired loan portfolios for further credit deterioration, if any. Reclassifications Certain reclassifications have been made to the 2016 financial statements to conform to the 2017 presentation. Impact of Recent Authoritative Accounting Guidance The Accounting Standards Codification ™ (“ASC”) is the Financial Accounting Standards Board’s (“FASB”) officially recognized source of authoritative GAAP applicable to all public and non-public non-governmental entities. Rules and interpretive releases of the Securities and Exchange Commission (“SEC”) under the authority of the federal securities laws are also sources of authoritative GAAP for the Company as an SEC registrant. All other accounting literature is non-authoritative. The following paragraphs provide descriptions of recently adopted or newly issued but not yet effective accounting standards that could have a material effect on the Company’s financial position or results of operations. In August 2017, FASB amended FASB ASC Topic 815, Derivatives and Hedging . The objective of the amendments were to improve the financial reporting of hedging relationships to better portray the economic results of an entity’s risk management activities in its financial statements. In addition, the amendments made targeted improvements to simplify the application of the hedge accounting guidance. The amendments are effective for public business entities for the first interim and annual reporting periods beginning after December 15, 2018 and early adoption is permitted. The Company is currently evaluating the full impact of the amendments on its existing interest rate swaps and whether it will early adopt. The Company does not expect there to be an impact to the Company’s financial position and results of operations, although, there may be additional financial statement disclosures. The accounting policies and procedures will be modified after the Company has fully evaluated the standard, although significant changes are not expected. In March 2017, FASB amended FASB ASC Subtopic 310-20, Receivables-Nonrefundable Fees and Other Costs. The amendments in the Update shorten the amortization period for certain callable debt securities held at a premium. Specifically, the amendments require the premium to be amortized to the earliest call date instead of the maturity date. The amendments do not require an accounting change for securities held at a discount; the discount continues to be amortized to maturity. The amendments are effective for public business entities for the first interim and annual reporting periods beginning after December 15, 2018. Early adoption is permitted and if adopted in an interim period, any adjustments should be reflected as of the beginning of the year that includes the interim period. The entity should apply the amendments on a modified retrospective basis through a cumulative-effective adjustment directly to retained earnings as of the beginning of the period of adoption. The Company has premiums on debt securities that are currently being amortized to the maturity date, primarily in the state and local governments category. The Company is currently evaluating the amount of the premium associated with debt securities that will be impacted by the amendments, the impact the amendments will have to the Company’s financial position and results of operations, and whether it will early adopt. The accounting policies and procedures will be modified after the Company has fully evaluated the standard, although significant changes are not expected. In January 2017, FASB amended FASB ASC Topic 350, Simplifying the Test for Goodwill. The amendments in the Update simplify the measurement of goodwill by eliminating Step 2 from the goodwill impairment test. Instead, under these amendments, an entity should perform its annual, or interim, goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount. An entity should recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value; however, the loss should not exceed the total amount of goodwill allocated to that reporting unit. The amendments are effective for public business entities for the first interim and annual reporting periods beginning after December 15, 2019. Early adoption is permitted for interim or annual goodwill impairment tests performed on testing dates after January 1, 2017. The Company has goodwill from prior business combinations and performs an annual impairment test or more frequently if changes or circumstances occur that would more-likely-than-not reduce the fair value of the reporting unit below its carrying value. During the third quarter of 2017, the Company performed its impairment assessment and determined the fair value of the aggregated reporting units exceed the carrying value, such that the Company’s goodwill was not considered impaired. Although the Company cannot anticipate future goodwill impairment assessments, based on the most recent assessment, it is unlikely that an impairment amount would need to be calculated and, therefore, the Company does not anticipate a material impact from these amendments to the Company’s financial position and results of operations. The current accounting policies and processes are not anticipated to change, except for the elimination of the Step 2 analysis. For additional information regarding goodwill impairment testing, see Note 4. In June 2016, FASB amended FASB ASC Topic 326, Financial Instruments - Credit Losses. The amendments in this Update replace the incurred loss model with a methodology that reflects expected credit losses over the life of the loan and requires consideration of a broader range of reasonable and supportable information to calculate credit loss estimates. The amendments are effective for public business entities for the first interim and annual reporting periods beginning after December 15, 2019. The Company is currently evaluating the impact of these amendments to the Company’s financial position and results of operations and currently does not know or cannot reasonably quantify the impact of the adoption of the amendments as a result of the complexity and extensive changes from the amendments. The ALLL is a material estimate of the Company and given the change from an incurred loss model to a methodology that considers the credit loss over the life of the loan, there is the potential for an increase in the ALLL at adoption date. The Company is anticipating a significant change in the processes and procedures to calculate the ALLL, including changes in assumptions and estimates to consider expected credit losses over the life of the loan versus the current accounting practice that utilizes the incurred loss model. The Company will also develop new procedures for determining an allowance for credit losses relating to held-to-maturity investment securities. In addition, the current accounting policy and procedures for other-than-temporary impairment on available-for-sale investment securities will be replaced with an allowance approach. The Company has formed a project team and is actively reviewing the standard for developing and implementing processes and procedures during the next two years to ensure it is fully compliant with the amendments at adoption date. For additional information on the allowance for loan losses, see Note 3. In March 2016, FASB amended FASB ASC Topic 718, Compensation - Stock Compensation. The amendments in this Update address certain aspects of the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and classification of awards on the statement of cash flows. The amendments were effective for public business entities for the first interim and annual reporting periods beginning after December 15, 2016 and the Company adopted the amendments as of January 1, 2017. The amendments require entities to recognize all income tax effects related to share-based payment awards in the statement of operations when the awards vest or are settled. Previously, income tax benefits at the settlement of awards were reported as increases (or decreases) to additional paid-in capital to the extent that those benefits were greater than (or less than) the income tax benefits recognized in earnings during the awards’ vesting periods. Such amounts are to be classified as an operating activity in the statement of cash flows instead of the prior accounting treatment, which required it to be classified as both an operating and a financing activity. The Company has elected to apply this classification change on a retrospective basis. Also in connection with the adoption of the Update, the Company has elected to change its accounting policy to recognize forfeitures as they occur. The requirement to report income tax effects in earnings has been applied to the settlement of awards on a prospective basis and the impact of applying the guidance reduced reported income tax expense for the nine month period ended September 30, 2017 by $555,000 , or approximately $0.01 per diluted common share. The implementation of the remaining provisions of the Update did not have a significant impact on the Company’s consolidated financial statements. In February 2016, FASB amended FASB ASC Topic 842, Leases. The amendments in this Update address several aspects of lease accounting with the significant change being the recognition of lease assets and lease liabilities for leases previously classified as operating leases. The amendments are effective for public business entities for the first interim and annual reporting periods beginning after December 15, 2018, and early adoption is permitted. The Company has several lease agreements for which the amendments will require the Company to recognize a lease liability to make lease payments and a right-of-use asset which will represent its right to use the underlying asset for the lease term. The Company is currently reviewing the amendments to ensure it is fully compliant by the adoption date and doesn’t expect to early adopt. As permitted by the amendments, the Company is anticipating electing an accounting policy to not recognize lease assets and lease liabilities for leases with a term of twelve months or less. The impact is not expected to have a material effect on the Company’s financial position or results of operations since the Company does not have a material amount of lease agreements. The Company is currently in the process of fully evaluating the amendments and will subsequently implement new processes which are not expected to significantly change since the Company already has processes for certain lease agreements that recognize the lease assets and lease liabilities. In addition, the Company will change its current accounting policies to comply with the amendments with such changes as mentioned above. In January 2016, FASB amended FASB ASC Topic 825, Financial Instruments. The amendments in this Update address certain aspects of recognition, measurement, presentation, and disclosure of financial instruments. The amendments are effective for public business entities for the first interim and annual reporting periods beginning after December 15, 2017. Early adoption is only permitted under certain circumstances outlined in the amendments. A reporting entity should apply the amendments by means of a cumulative-effect adjustment to the Company’s statement of financial condition as of the beginning of the reporting year of adoption. The amendments will impact the Company in a fe

Investment Securities

Investment Securities	9 Months Ended
	Sep. 30, 2017
Investments, Debt and Equity Securities [Abstract]
Investment Securities	Investment Securities The following tables present the amortized cost, the gross unrealized gains and losses and the fair value of the Company’s investment securities: September 30, 2017 Amortized Cost Gross Unrealized Fair Value (Dollars in thousands) Gains Losses Available-for-sale U.S. government and federal agency $ 34,161 45 (160 ) 34,046 U.S. government sponsored enterprises 19,178 100 (11 ) 19,267 State and local governments 623,296 22,616 (3,939 ) 641,973 Corporate bonds 248,865 1,281 (156 ) 249,990 Residential mortgage-backed securities 837,808 3,703 (2,582 ) 838,929 Commercial mortgage-backed securities 102,843 214 (745 ) 102,312 Total available-for-sale 1,866,151 27,959 (7,593 ) 1,886,517 Held-to-maturity State and local governments 655,128 23,503 (7,433 ) 671,198 Total held-to-maturity 655,128 23,503 (7,433 ) 671,198 Total investment securities $ 2,521,279 51,462 (15,026 ) 2,557,715 December 31, 2016 Amortized Cost Gross Unrealized Fair Value (Dollars in thousands) Gains Losses Available-for-sale U.S. government and federal agency $ 39,554 15 (162 ) 39,407 U.S. government sponsored enterprises 19,557 55 (42 ) 19,570 State and local governments 775,395 20,941 (9,963 ) 786,373 Corporate bonds 471,569 1,175 (793 ) 471,951 Residential mortgage-backed securities 1,014,518 2,744 (9,747 ) 1,007,515 Commercial mortgage-backed securities 102,209 30 (1,578 ) 100,661 Total available-for-sale 2,422,802 24,960 (22,285 ) 2,425,477 Held-to-maturity State and local governments 675,674 21,400 (7,985 ) 689,089 Total held-to-maturity 675,674 21,400 (7,985 ) 689,089 Total investment securities $ 3,098,476 46,360 (30,270 ) 3,114,566 The following table presents the amortized cost and fair value of available-for-sale and held-to-maturity securities by contractual maturity at September 30, 2017 . Actual maturities may differ from expected or contractual maturities since issuers have the right to prepay obligations with or without prepayment penalties. September 30, 2017 Available-for-Sale Held-to-Maturity (Dollars in thousands) Amortized Cost Fair Value Amortized Cost Fair Value Due within one year $ 83,120 83,270 — — Due after one year through five years 248,611 250,105 1,697 1,756 Due after five years through ten years 225,885 235,110 72,217 74,597 Due after ten years 367,884 376,791 581,214 594,845 925,500 945,276 655,128 671,198 Mortgage-backed securities 1 940,651 941,241 — — Total $ 1,866,151 1,886,517 655,128 671,198 __________ 1 Mortgage-backed securities, which have prepayment provisions, are not assigned to maturity categories due to fluctuations in their prepayment speeds. Proceeds from sales and calls of investment securities and the associated gains and losses that have been included in earnings are listed below: Three Months ended Nine Months ended (Dollars in thousands) September 30, September 30, September 30, September 30, Available-for-sale Proceeds from sales and calls of investment securities $ 155,894 59,974 268,557 148,458 Gross realized gains 1 278 366 3,345 1,309 Gross realized losses 1 (201 ) (960 ) (3,864 ) (1,960 ) Held-to-maturity Proceeds from calls of investment securities 3,675 340 18,910 21,965 Gross realized gains 1 — — 153 91 Gross realized losses 1 — — (179 ) (146 ) __________ 1 The gain or loss on the sale or call of each investment security is determined by the specific identification method. Investment securities with an unrealized loss position are summarized as follows: September 30, 2017 Less than 12 Months 12 Months or More Total (Dollars in thousands) Fair Value Unrealized Loss Fair Value Unrealized Loss Fair Value Unrealized Loss Available-for-sale U.S. government and federal agency $ 1,952 (18 ) 13,548 (142 ) 15,500 (160 ) U.S. government sponsored enterprises 3,460 (11 ) — — 3,460 (11 ) State and local governments 76,806 (932 ) 83,941 (3,007 ) 160,747 (3,939 ) Corporate bonds 48,048 (150 ) 3,270 (6 ) 51,318 (156 ) Residential mortgage-backed securities 350,965 (2,102 ) 38,751 (480 ) 389,716 (2,582 ) Commercial mortgage-backed securities 58,628 (707 ) 8,116 (38 ) 66,744 (745 ) Total available-for-sale $ 539,859 (3,920 ) 147,626 (3,673 ) 687,485 (7,593 ) Held-to-maturity State and local governments $ 10,683 (139 ) 104,858 (7,294 ) 115,541 (7,433 ) Total held-to-maturity $ 10,683 (139 ) 104,858 (7,294 ) 115,541 (7,433 ) December 31, 2016 Less than 12 Months 12 Months or More Total (Dollars in thousands) Fair Value Unrealized Loss Fair Value Unrealized Loss Fair Value Unrealized Loss Available-for-sale U.S. government and federal agency $ 6,718 (24 ) 26,239 (138 ) 32,957 (162 ) U.S. government sponsored enterprises 6,049 (42 ) — — 6,049 (42 ) State and local governments 222,700 (4,949 ) 81,783 (5,014 ) 304,483 (9,963 ) Corporate bonds 174,821 (774 ) 6,141 (19 ) 180,962 (793 ) Residential mortgage-backed securities 688,811 (9,079 ) 29,957 (668 ) 718,768 (9,747 ) Commercial mortgage-backed securities 89,298 (1,578 ) — — 89,298 (1,578 ) Total available-for-sale $ 1,188,397 (16,446 ) 144,120 (5,839 ) 1,332,517 (22,285 ) Held-to-maturity State and local governments $ 117,912 (1,712 ) 86,601 (6,273 ) 204,513 (7,985 ) Total held-to-maturity $ 117,912 (1,712 ) 86,601 (6,273 ) 204,513 (7,985 ) Based on an analysis of its investment securities with unrealized losses as of September 30, 2017 and December 31, 2016 , the Company determined that none of such securities had other-than-temporary impairment and the unrealized losses were primarily the result of interest rate changes and market spreads subsequent to acquisition. The fair value of the investment securities is expected to recover as payments are received and the securities approach maturity. At September 30, 2017 , management determined that it did not intend to sell investment securities with unrealized losses, and there was no expected requirement to sell any of its investment securities with unrealized losses before recovery of their amortized cost.

Loans Receivable, Net

Loans Receivable, Net	9 Months Ended
	Sep. 30, 2017
Receivables [Abstract]
Loans Receivable, Net	Loans Receivable, Net The Company’s loan portfolio is comprised of three segments: residential real estate, commercial, and consumer and other loans. The loan segments are further disaggregated into the following classes: residential real estate, commercial real estate, other commercial, home equity and other consumer loans. The following table presents loans receivable for each portfolio class of loans: At or for the Nine Months ended At or for the Year ended (Dollars in thousands) September 30, December 31, Residential real estate loans $ 734,242 674,347 Commercial loans Real estate 3,503,976 2,990,141 Other commercial 1,575,514 1,342,250 Total 5,079,490 4,332,391 Consumer and other loans Home equity 452,291 434,774 Other consumer 243,410 242,951 Total 695,701 677,725 Loans receivable 6,509,433 5,684,463 Allowance for loan and lease losses (129,576 ) (129,572 ) Loans receivable, net $ 6,379,857 5,554,891 Net deferred origination (fees) costs included in loans receivable $ (2,140 ) (1,228 ) Net purchase accounting (discounts) premiums included in loans receivable $ (17,803 ) (12,144 ) Weighted-average interest rate on loans (tax-equivalent) 4.80 % 4.77 % The following tables summarize the activity in the ALLL by portfolio segment: Three Months ended September 30, 2017 (Dollars in thousands) Total Residential Commercial Other Home Other Balance at beginning of period $ 129,877 11,522 68,503 36,984 7,662 5,206 Provision for loan losses 3,327 (10 ) 2,214 696 (682 ) 1,109 Charge-offs (5,983 ) (44 ) (3,227 ) (374 ) (15 ) (2,323 ) Recoveries 2,355 12 735 514 16 1,078 Balance at end of period $ 129,576 11,480 68,225 37,820 6,981 5,070 Three Months ended September 30, 2016 (Dollars in thousands) Total Residential Commercial Other Home Other Balance at beginning of period $ 132,386 13,666 66,809 37,031 8,629 6,251 Provision for loan losses 626 108 — (1,033 ) 561 990 Charge-offs (2,800 ) (11 ) (55 ) (342 ) (693 ) (1,699 ) Recoveries 2,322 148 490 923 77 684 Balance at end of period $ 132,534 13,911 67,244 36,579 8,574 6,226 Nine Months ended September 30, 2017 (Dollars in thousands) Total Residential Real Estate Commercial Real Estate Other Commercial Home Equity Other Consumer Balance at beginning of period $ 129,572 12,436 65,773 37,823 7,572 5,968 Provision for loan losses 7,938 (946 ) 6,403 551 (324 ) 2,254 Charge-offs (14,801 ) (87 ) (5,261 ) (1,855 ) (458 ) (7,140 ) Recoveries 6,867 77 1,310 1,301 191 3,988 Balance at end of period $ 129,576 11,480 68,225 37,820 6,981 5,070 Nine Months ended September 30, 2016 (Dollars in thousands) Total Residential Real Estate Commercial Real Estate Other Commercial Home Equity Other Consumer Balance at beginning of period $ 129,697 14,427 67,877 32,525 8,998 5,870 Provision for loan losses 1,194 (342 ) (3,490 ) 3,407 215 1,404 Charge-offs (5,332 ) (366 ) (342 ) (1,068 ) (891 ) (2,665 ) Recoveries 6,975 192 3,199 1,715 252 1,617 Balance at end of period $ 132,534 13,911 67,244 36,579 8,574 6,226 The following tables disclose the balance in the ALLL and the recorded investment in loans by portfolio segment: September 30, 2017 (Dollars in thousands) Total Residential Real Estate Commercial Real Estate Other Commercial Home Equity Other Consumer Allowance for loan and lease losses Individually evaluated for impairment $ 4,077 320 666 2,407 94 590 Collectively evaluated for impairment 125,499 11,160 67,559 35,413 6,887 4,480 Total allowance for loan and lease losses $ 129,576 11,480 68,225 37,820 6,981 5,070 Loans receivable Individually evaluated for impairment $ 122,893 13,410 79,070 22,456 4,600 3,357 Collectively evaluated for impairment 6,386,540 720,832 3,424,906 1,553,058 447,691 240,053 Total loans receivable $ 6,509,433 734,242 3,503,976 1,575,514 452,291 243,410 December 31, 2016 (Dollars in thousands) Total Residential Real Estate Commercial Real Estate Other Commercial Home Equity Other Consumer Allowance for loan and lease losses Individually evaluated for impairment $ 6,881 856 922 4,419 296 388 Collectively evaluated for impairment 122,691 11,580 64,851 33,404 7,276 5,580 Total allowance for loan and lease losses $ 129,572 12,436 65,773 37,823 7,572 5,968 Loans receivable Individually evaluated for impairment $ 130,263 11,612 85,634 23,950 5,934 3,133 Collectively evaluated for impairment 5,554,200 662,735 2,904,507 1,318,300 428,840 239,818 Total loans receivable $ 5,684,463 674,347 2,990,141 1,342,250 434,774 242,951 Substantially all of the Company’s loans receivable are with customers in the Company’s geographic market areas. Although the Company has a diversified loan portfolio, a substantial portion of its customers’ ability to honor their obligations is dependent upon the economic performance in the Company’s market areas. The following tables disclose information related to impaired loans by portfolio segment: At or for the Three or Nine Months ended September 30, 2017 (Dollars in thousands) Total Residential Real Estate Commercial Real Estate Other Commercial Home Equity Other Consumer Loans with a specific valuation allowance Recorded balance $ 17,940 3,121 5,275 7,832 336 1,376 Unpaid principal balance 18,432 3,272 5,364 8,038 353 1,405 Specific valuation allowance 4,077 320 666 2,407 94 590 Average balance - three months 17,616 3,005 5,151 7,667 363 1,430 Average balance - nine months 19,310 2,916 6,177 8,550 402 1,265 Loans without a specific valuation allowance Recorded balance $ 104,953 10,289 73,795 14,624 4,264 1,981 Unpaid principal balance 129,250 11,151 94,342 16,898 4,799 2,060 Average balance - three months 107,038 10,369 76,233 14,332 4,300 1,804 Average balance - nine months 109,355 9,937 77,286 15,199 5,026 1,907 Total Recorded balance $ 122,893 13,410 79,070 22,456 4,600 3,357 Unpaid principal balance 147,682 14,423 99,706 24,936 5,152 3,465 Specific valuation allowance 4,077 320 666 2,407 94 590 Average balance - three months 124,654 13,374 81,384 21,999 4,663 3,234 Average balance - nine months 128,665 12,853 83,463 23,749 5,428 3,172 At or for the Year ended December 31, 2016 (Dollars in thousands) Total Residential Real Estate Commercial Real Estate Other Commercial Home Equity Other Consumer Loans with a specific valuation allowance Recorded balance $ 22,128 2,759 9,129 8,814 334 1,092 Unpaid principal balance 22,374 2,825 9,130 8,929 345 1,145 Specific valuation allowance 6,881 856 922 4,419 296 388 Average balance 26,745 4,942 10,441 9,840 257 1,265 Loans without a specific valuation allowance Recorded balance $ 108,135 8,853 76,505 15,136 5,600 2,041 Unpaid principal balance 131,059 9,925 94,180 17,724 7,120 2,110 Average balance 108,827 12,858 72,323 15,537 6,004 2,105 Total Recorded balance $ 130,263 11,612 85,634 23,950 5,934 3,133 Unpaid principal balance 153,433 12,750 103,310 26,653 7,465 3,255 Specific valuation allowance 6,881 856 922 4,419 296 388 Average balance 135,572 17,800 82,764 25,377 6,261 3,370 Interest income recognized on impaired loans for the nine months ended September 30, 2017 and 2016 was not significant. The following tables present an aging analysis of the recorded investment in loans by portfolio segment: September 30, 2017 (Dollars in thousands) Total Residential Real Estate Commercial Real Estate Other Commercial Home Equity Other Consumer Accruing loans 30-59 days past due $ 22,567 459 12,806 5,959 1,805 1,538 Accruing loans 60-89 days past due 6,548 1,000 2,800 1,090 987 671 Accruing loans 90 days or more past due 3,944 420 — 3,261 200 63 Non-accrual loans 46,770 5,321 27,924 8,540 3,945 1,040 Total past due and non-accrual loans 79,829 7,200 43,530 18,850 6,937 3,312 Current loans receivable 6,429,604 727,042 3,460,446 1,556,664 445,354 240,098 Total loans receivable $ 6,509,433 734,242 3,503,976 1,575,514 452,291 243,410 December 31, 2016 (Dollars in thousands) Total Residential Real Estate Commercial Real Estate Other Commercial Home Equity Other Consumer Accruing loans 30-59 days past due $ 20,599 6,338 5,079 5,388 2,439 1,355 Accruing loans 60-89 days past due 5,018 1,398 754 1,352 844 670 Accruing loans 90 days or more past due 1,099 266 145 283 191 214 Non-accrual loans 49,332 4,528 30,216 8,817 5,240 531 Total past due and non-accrual loans 76,048 12,530 36,194 15,840 8,714 2,770 Current loans receivable 5,608,415 661,817 2,953,947 1,326,410 426,060 240,181 Total loans receivable $ 5,684,463 674,347 2,990,141 1,342,250 434,774 242,951 The following tables present TDRs that occurred during the periods presented and the TDRs that occurred within the previous twelve months that subsequently defaulted during the periods presented: Three Months ended September 30, 2017 (Dollars in thousands) Total Residential Commercial Other Home Other TDRs that occurred during the period Number of loans 5 1 1 3 — — Pre-modification recorded balance $ 956 317 386 253 — — Post-modification recorded balance $ 956 317 386 253 — — TDRs that subsequently defaulted Number of loans — — — — — — Recorded balance $ — — — — — — Three Months ended September 30, 2016 (Dollars in thousands) Total Residential Commercial Other Home Other TDRs that occurred during the period Number of loans 5 — 4 1 — — Pre-modification recorded balance $ 7,781 — 7,014 767 — — Post-modification recorded balance $ 7,718 — 6,990 728 — — TDRs that subsequently defaulted Number of loans 1 — — 1 — — Recorded balance $ 5 — — 5 — — Nine Months ended September 30, 2017 (Dollars in thousands) Total Residential Real Estate Commercial Real Estate Other Commercial Home Equity Other Consumer TDRs that occurred during the period Number of loans 22 4 7 8 2 1 Pre-modification recorded balance $ 22,912 652 13,003 9,069 178 10 Post-modification recorded balance $ 20,230 652 10,321 9,069 178 10 TDRs that subsequently defaulted Number of loans 1 — — 1 — — Recorded balance $ 18 — — 18 — — Nine Months ended September 30, 2016 (Dollars in thousands) Total Residential Real Estate Commercial Real Estate Other Commercial Home Equity Other Consumer TDRs that occurred during the period Number of loans 27 — 10 15 2 — Pre-modification recorded balance $ 21,652 — 9,217 12,226 209 — Post-modification recorded balance $ 21,613 — 9,193 12,211 209 — TDRs that subsequently defaulted Number of loans 9 — 1 2 — 6 Recorded balance $ 704 — 570 5 — 129 The modifications for the TDRs that occurred during the nine months ended September 30, 2017 and 2016 included one or a combination of the following: an extension of the maturity date, a reduction of the interest rate or a reduction in the principal amount. In addition to the TDRs that occurred during the period provided in the preceding tables, the Company had TDRs with pre-modification loan balances of $5,152,000 and $4,967,000 for the nine months ended September 30, 2017 and 2016 , respectively, for which other real estate owned (“OREO”) was received in full or partial satisfaction of the loans. The majority of such TDRs were in home equity and residential real estate for the nine months ended September 30, 2017 and 2016 , respectively. At September 30, 2017 and December 31, 2016 , the Company had $2,559,000 and $1,770,000 , respectively, of consumer mortgage loans secured by residential real estate properties for which formal foreclosure proceedings are in process. At September 30, 2017 and December 31, 2016 , the Company had $986,000 and $2,699,000 , respectively, of OREO secured by residential real estate properties.

Goodwill

Goodwill	9 Months Ended
	Sep. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	Goodwill The following schedule discloses the changes in the carrying value of goodwill: Three Months ended Nine Months ended (Dollars in thousands) September 30, September 30, September 30, September 30, Net carrying value at beginning of period $ 177,811 140,638 147,053 140,638 Acquisitions and adjustments — 6,415 30,758 6,415 Net carrying value at end of period $ 177,811 147,053 177,811 147,053 The gross carrying value of goodwill and the accumulated impairment charge consists of the following: (Dollars in thousands) September 30, December 31, Gross carrying value $ 217,970 187,212 Accumulated impairment charge 1 (40,159 ) (40,159 ) Net carrying value $ 177,811 147,053 __________ 1 A goodwill impairment charge was recognized in 2011 and was due to high levels of volatility and dislocation in bank stock prices nationwide. The Company performed its annual goodwill impairment test during the third quarter of 2017 and determined the fair value of the aggregated reporting units exceeded the carrying value, such that the Company’s goodwill was not considered impaired. Changes in the economic environment, operations of the aggregated reporting units, or other factors could result in the decline in the fair value of the aggregated reporting units which could result in a goodwill impairment in the future. For additional information on goodwill related to acquisitions, see Note 12.

Variable Interest Entities

Variable Interest Entities	9 Months Ended
	Sep. 30, 2017
Equity Method Investments and Joint Ventures [Abstract]
Variable Interest Entities	Variable Interest Entities A VIE is a partnership, limited liability company, trust or other legal entity that meets one of the following criteria: 1) the entity’s equity investment at risk is not sufficient to permit the entity to finance its activities without additional subordinated financial support from other parties; 2) the holders of the equity investment at risk, as a group, lack the characteristics of a controlling financial interest; and 3) the voting rights of some holders of the equity investment at risk are disproportionate to their obligation to absorb losses or receive returns, and substantially all of the activities are conducted on behalf of the holder of equity investment at risk with disproportionately few voting rights. A VIE must be consolidated by the Company if it is deemed to be the primary beneficiary, which is the party involved with the VIE that has both: 1) the power to direct the activities of the VIE that most significantly affect the VIE’s economic performance; and 2) the obligation to absorb the losses of the VIE that could potentially be significant to the VIE or the right to receive benefits from the VIE that could potentially be significant to the VIE. The Company’s VIEs are regularly monitored to determine if any reconsideration events have occurred that could cause the primary beneficiary status to change. A previously unconsolidated VIE is consolidated when the Company becomes the primary beneficiary. A previously consolidated VIE is deconsolidated when the Company ceases to be the primary beneficiary or the entity is no longer a VIE. Consolidated Variable Interest Entities The Company has equity investments in Certified Development Entities (“CDE”) which have received allocations of New Markets Tax Credits (“NMTC”). The NMTC program provides federal tax incentives to investors to make investments in distressed communities and promotes economic improvements through the development of successful businesses in these communities. The NMTC is available to investors over a seven -year period and is subject to recapture if certain events occur during such period. The maximum exposure to loss in the CDEs is the amount of equity invested and credit extended by the Company. However, the Company has credit protection in the form of indemnification agreements, guarantees, and collateral arrangements. The Company has evaluated the variable interests held by the Company in each CDE (NMTC) investment and determined the Company does not individually meet the characteristics of a primary beneficiary; however, the related-party group does meet the criteria as a group and substantially all of the activities of the CDEs either involve or are conducted on behalf of the Company. As a result, the Company is the primary beneficiary of the CDEs and their assets, liabilities, and results of operations are included in the Company’s consolidated financial statements. The primary activities of the CDEs are recognized in commercial loans interest income and other borrowed funds interest expense on the Company’s statements of operations and the federal income tax credit allocations from the investments are recognized in the Company’s statements of operations as a component of income tax expense. Such related cash flows are recognized in loans originated, principal collected on loans and change in other borrowed funds. The following table summarizes the carrying amounts of the consolidated VIEs’ assets and liabilities included in the Company’s statements of financial condition and are adjusted for intercompany eliminations. All assets presented can be used only to settle obligations of the consolidated VIEs and all liabilities presented consist of liabilities for which creditors and other beneficial interest holders therein have no recourse to the general credit of the Company. (Dollars in thousands) September 30, December 31, Assets Loans receivable $ 57,796 36,950 Accrued interest receivable 93 120 Other assets 3,261 1,984 Total assets $ 61,150 39,054 Liabilities Other borrowed funds $ 7,964 4,105 Accrued interest payable 15 2 Other liabilities 6 27 Total liabilities $ 7,985 4,134 Unconsolidated Variable Interest Entities The Company has equity investments in Low-Income Housing Tax Credit (“LIHTC”) partnerships with carrying values of $8,127,000 and $7,282,000 as of September 30, 2017 and December 31, 2016 , respectively. The LIHTCs are indirect federal subsidies to finance low-income housing and are used in connection with both newly constructed and renovated residential rental buildings. Once a project is placed in service, it is generally eligible for the tax credit for ten consecutive years. To continue generating the tax credit and to avoid tax credit recapture, a LIHTC building must satisfy specific low-income housing compliance rules for a full fifteen -year period. The maximum exposure to loss in the VIEs is the amount of equity invested and credit extended by the Company. However, the Company has credit protection in the form of indemnification agreements, guarantees, and collateral arrangements. The Company has evaluated the variable interests held by the Company in each LIHTC investment and determined that the Company does not have controlling financial interests in such investments, and is not the primary beneficiary. The Company reports the investments in the unconsolidated LIHTCs as other assets on the Company’s statements of financial condition. Total unfunded contingent commitments related to the Company’s LIHTC investments totaled $23,283,000 at September 30, 2017 , of which $14,947,000 is expected to be fulfilled in 2017 and $8,336,000 is expected to be fulfilled in 2018 . There were no impairment losses on the Company’s LIHTC investments during the nine months ended September 30, 2017 . The Company has elected to use the proportional amortization method for the amortization of all eligible LIHTC investments and amortization expense is recognized as a component of income tax expense. The following table summarizes the amortization expense and the amount of tax credits and other tax benefits recognized for qualified affordable housing project investments during the periods presented. Three Months ended Nine Months ended (Dollars in thousands) September 30, September 30, September 30, September 30, Amortization expense $ 682 258 1,825 867 Tax credits and other tax benefits recognized 1,040 322 2,792 1,145 The Company also owns the following trust subsidiaries, each of which issued trust preferred securities as Tier 1 capital instruments: Glacier Capital Trust II, Glacier Capital Trust III, Glacier Capital Trust IV, Citizens (ID) Statutory Trust I, Bank of the San Juans Bancorporation Trust I, First Company Statutory Trust 2001, and First Company Statutory Trust 2003. The trust subsidiaries have no assets, operations, revenues or cash flows other than those related to the issuance, administration and repayment of the securities held by third parties. The trust subsidiaries are not included in the Company’s consolidated financial statements because the sole asset of each trust subsidiary is a receivable from the Company, even though the Company owns all of the voting equity shares of the trust subsidiaries, has fully guaranteed the obligations of the trust subsidiaries and may have the right to redeem the third party securities under certain circumstances. The Company reports the trust preferred securities issued to the trust subsidiaries as subordinated debentures on the Company’s statements of financial condition.

Securities Sold Under Agreement

Securities Sold Under Agreements to Repurchase	9 Months Ended
	Sep. 30, 2017
Transfers and Servicing [Abstract]
Securities Sold Under Agreements to Repurchase	Securities Sold Under Agreements to Repurchase The Company’s securities sold under agreements to repurchase (“repurchase agreements”) totaled $453,596,000 and $473,650,000 at September 30, 2017 and December 31, 2016 , respectively, and are secured by investment securities with carrying values of $528,791,000 and $472,239,000 , respectively. Securities are pledged to customers at the time of the transaction in an amount at least equal to the outstanding balance and are held in custody accounts by third parties. The fair value of collateral is continually monitored and additional collateral is provided as deemed appropriate. The following tables summarize the carrying value of the Company’s repurchase agreements by remaining contractual maturity and category of collateral: September 30, 2017 Remaining Contractual Maturity of the Agreements (Dollars in thousands) Overnight and Continuous Up to 30 Days Total U.S. government and federal agency $ 4,261 — 4,261 Residential mortgage-backed securities 438,872 — 438,872 Commercial mortgage-backed securities 10,463 — 10,463 Total $ 453,596 — 453,596 December 31, 2016 Remaining Contractual Maturity of the Agreements (Dollars in thousands) Overnight and Continuous Up to 30 Days Total Residential mortgage-backed securities $ 471,706 643 472,349 Commercial mortgage-backed securities 1,301 — 1,301 Total $ 473,007 643 473,650

Derivatives and Hedging Activit

Derivatives and Hedging Activities	9 Months Ended
	Sep. 30, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives and Hedging Activities	Derivatives and Hedging Activities As of September 30, 2017 , the Company’s interest rate swap derivative financial instruments were designated as cash flow hedges and are summarized as follows: (Dollars in thousands) Forecasted Notional Amount Variable Interest Rate 1 Fixed Interest Rate 1 Payment Term Interest rate swap $ 160,000 3 month LIBOR 3.378 % Oct. 21, 2014 - Oct. 21, 2021 Interest rate swap 100,000 3 month LIBOR 2.498 % Nov. 30, 2015 - Nov. 30, 2022 __________ 1 The Company pays the fixed interest rate and the counterparty pays the Company the variable interest rate. The hedging strategy converts the LIBOR-based variable interest rate on borrowings to a fixed interest rate, thereby protecting the Company from interest rate variability. The interest rate swaps with the $160,000,000 and $100,000,000 notional amounts began their payment terms in October 2014 and November 2015, respectively. The Company designated wholesale deposits and Federal Home Loan Bank (“FHLB”) advances as the cash flow hedge and these hedged items were determined to be fully effective during the current and prior year. As such, no amount of ineffectiveness has been included in the Company’s statements of operations for the nine months ended September 30, 2017 and 2016 . Therefore, the aggregate fair value of the interest rate swaps was recorded in other liabilities with changes recorded in other comprehensive income (“OCI”). The Company expects the hedges to remain highly effective during the remaining terms of the interest rate swaps. Interest expense recorded on the interest rate swaps totaled $5,993,000 and $6,015,000 for the nine months ended September 30, 2017 and 2016 , respectively, and is reported as a component of interest expense on deposits and FHLB advances. Unless the interest rate swaps are terminated during the next year, the Company expects $4,494,000 of the unrealized loss reported in other comprehensive income at September 30, 2017 to be reclassified to interest expense during the next twelve months. The following table presents the pre-tax gains or losses recorded in accumulated other comprehensive income and the Company’s statements of operations relating to the interest rate swap derivative financial instruments: Three Months ended Nine Months ended (Dollars in thousands) September 30, September 30, September 30, September 30, Interest rate swaps Amount of gain (loss) recognized in OCI (effective portion) $ 45 1,959 (1,799 ) (11,989 ) Amount of loss reclassified from OCI to interest expense (1,182 ) (1,555 ) (3,776 ) (4,962 ) Amount of loss recognized in other non-interest expense (ineffective portion) — — — — The following table discloses the offsetting of financial liabilities and interest rate swap derivative liabilities. There were no interest rate swap derivative assets at the dates presented. September 30, 2017 December 31, 2016 (Dollars in thousands) Gross Amounts of Recognized Liabilities Gross Amounts Offset in the Statements of Financial Position Net Amounts of Liabilities Presented in the Statements of Financial Position Gross Amounts of Recognized Liabilities Gross Amounts Offset in the Statements of Financial Position Net Amounts of Liabilities Presented in the Statements of Financial Position Interest rate swaps $ 12,748 — 12,748 14,725 — 14,725 Pursuant to the interest rate swap agreements, the Company pledged collateral to the counterparty in the form of investment securities totaling $25,122,000 at September 30, 2017 . There was $0 collateral pledged from the counterparty to the Company as of September 30, 2017 . There is the possibility that the Company may need to pledge additional collateral in the future if there were declines in the fair value of the interest rate swap derivative financial instruments versus the collateral pledged.

Other Expenses

Other Expenses	9 Months Ended
	Sep. 30, 2017
Other Expenses [Abstract]
Other Expenses	Other Expenses Other expenses consists of the following: Three Months ended Nine Months ended (Dollars in thousands) September 30, September 30, September 30, September 30, Debit card expenses $ 1,840 2,521 5,352 6,606 Consulting and outside services 1,247 1,516 3,651 3,840 Employee expenses 1,055 948 2,969 2,434 Telephone 988 976 2,899 2,881 VIE amortization and other expenses 1,041 773 2,453 1,814 Loan expenses 653 1,062 2,266 2,800 Postage 646 626 2,007 2,296 Printing and supplies 605 733 1,913 2,397 Accounting and audit fees 499 383 1,508 1,053 Business development 641 629 1,434 1,514 ATM expenses 641 250 1,335 768 Checking and operating expenses 564 742 1,291 2,434 Mergers and acquisition expenses 245 228 1,194 1,364 Legal fees 319 177 825 730 Other 1,214 848 3,026 2,705 Total other expenses $ 12,198 12,412 34,123 35,636

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Loss)	9 Months Ended
	Sep. 30, 2017
Equity [Abstract]
Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss) The following table illustrates the activity within accumulated other comprehensive income (loss) by component, net of tax: (Dollars in thousands) Gains on Available-For-Sale Securities Losses on Derivatives Used for Cash Flow Hedges Total Balance at December 31, 2015 $ 13,935 (11,946 ) 1,989 Other comprehensive income (loss) before reclassifications 18,755 (7,344 ) 11,411 Amounts reclassified from accumulated other comprehensive income 399 3,039 3,438 Net current period other comprehensive income (loss) 19,154 (4,305 ) 14,849 Balance at September 30, 2016 $ 33,089 (16,251 ) 16,838 Balance at December 31, 2016 $ 1,639 (9,021 ) (7,382 ) Other comprehensive income (loss) before reclassifications 10,520 (1,102 ) 9,418 Amounts reclassified from accumulated other comprehensive income 318 2,313 2,631 Net current period other comprehensive income 10,838 1,211 12,049 Balance at September 30, 2017 $ 12,477 (7,810 ) 4,667

Earnings Per Share

Earnings Per Share	9 Months Ended
	Sep. 30, 2017
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share Basic earnings per share is computed by dividing net income by the weighted-average number of shares of common stock outstanding during the period presented. Diluted earnings per share is computed by including the net increase in shares as if dilutive outstanding restricted stock awards were vested, using the treasury stock method. Basic and diluted earnings per share has been computed based on the following: Three Months ended Nine Months ended (Dollars in thousands, except per share data) September 30, September 30, September 30, September 30, Net income available to common stockholders, basic and diluted $ 36,479 30,957 101,421 90,090 Average outstanding shares - basic 78,004,450 76,288,640 77,379,514 76,195,550 Add: dilutive restricted stock awards 61,492 62,233 63,430 51,501 Average outstanding shares - diluted 78,065,942 76,350,873 77,442,944 76,247,051 Basic earnings per share $ 0.47 0.40 1.31 1.18 Diluted earnings per share $ 0.47 0.40 1.31 1.18 There were 0 and 10,677 restricted stock awards excluded from the diluted average outstanding share calculation for the nine months ended September 30, 2017 and 2016 , respectively. Anti-dilution occurs when the unrecognized compensation cost per share of a restricted stock award exceeds the market price of the Company’s stock.

Fair Value of Assets and Liabil

Fair Value of Assets and Liabilities	9 Months Ended
	Sep. 30, 2017
Fair Value Disclosures [Abstract]
Fair Value of Assets and Liabilities	Fair Value of Assets and Liabilities Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. There is a fair value hierarchy which requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. The three levels of inputs that may be used to measure fair value are as follows: Level 1 Quoted prices in active markets for identical assets or liabilities Level 2 Observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities Level 3 Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities Transfers in and out of Level 1 (quoted prices in active markets), Level 2 (significant other observable inputs) and Level 3 (significant unobservable inputs) are recognized on the actual transfer date. There were no transfers between fair value hierarchy levels during the nine month periods ended September 30, 2017 and 2016 . Recurring Measurements The following is a description of the inputs and valuation methodologies used for assets and liabilities measured at fair value on a recurring basis, as well as the general classification of such assets and liabilities pursuant to the valuation hierarchy. There have been no significant changes in the valuation techniques during the period ended September 30, 2017 . Investment securities, available-for-sale: fair value for available-for-sale securities is estimated by obtaining quoted market prices for identical assets, where available. If such prices are not available, fair value is based on independent asset pricing services and models, the inputs of which are market-based or independently sourced market parameters, including but not limited to, yield curves, interest rates, volatilities, market spreads, prepayments, defaults, recoveries, cumulative loss projections, and cash flows. Such securities are classified in Level 2 of the valuation hierarchy. Where Level 1 or Level 2 inputs are not available, such securities are classified as Level 3 within the hierarchy. Fair value determinations of available-for-sale securities are the responsibility of the Company’s corporate accounting and treasury departments. The Company obtains fair value estimates from independent third party vendors on a monthly basis. The vendors’ pricing system methodologies, procedures and system controls are reviewed to ensure they are appropriately designed and operating effectively. The Company reviews the vendors’ inputs for fair value estimates and the recommended assignments of levels within the fair value hierarchy. The review includes the extent to which markets for investment securities are determined to have limited or no activity, or are judged to be active markets. The Company reviews the extent to which observable and unobservable inputs are used as well as the appropriateness of the underlying assumptions about risk that a market participant would use in active markets, with adjustments for limited or inactive markets. In considering the inputs to the fair value estimates, the Company places less reliance on quotes that are judged to not reflect orderly transactions, or are non-binding indications. In assessing credit risk, the Company reviews payment performance, collateral adequacy, third party research and analyses, credit rating histories and issuers’ financial statements. For those markets determined to be inactive or limited, the valuation techniques used are models for which management has verified that discount rates are appropriately adjusted to reflect illiquidity and credit risk. Interest rate swap derivative financial instruments: fair values for interest rate swap derivative financial instruments are based upon the estimated amounts to settle the contracts considering current interest rates and are calculated using discounted cash flows that are observable or that can be corroborated by observable market data and, therefore, are classified within Level 2 of the valuation hierarchy. The inputs used to determine fair value include the 3 month LIBOR forward curve to estimate variable rate cash inflows and the Fed Funds Effective Swap Rate to estimate the discount rate. The estimated variable rate cash inflows are compared to the fixed rate outflows and such difference is discounted to a present value to estimate the fair value of the interest rate swaps. The Company also obtains and compares the reasonableness of the pricing from an independent third party. The following tables disclose the fair value measurement of assets and liabilities measured at fair value on a recurring basis: Fair Value Measurements At the End of the Reporting Period Using (Dollars in thousands) Fair Value September 30, 2017 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Investment securities, available-for-sale U.S. government and federal agency $ 34,046 — 34,046 — U.S. government sponsored enterprises 19,267 — 19,267 — State and local governments 641,973 — 641,973 — Corporate bonds 249,990 — 249,990 — Residential mortgage-backed securities 838,929 — 838,929 — Commercial mortgage-backed securities 102,312 — 102,312 — Total assets measured at fair value on a recurring basis $ 1,886,517 — 1,886,517 — Interest rate swaps $ 12,748 — 12,748 — Total liabilities measured at fair value on a recurring basis $ 12,748 — 12,748 — Fair Value Measurements At the End of the Reporting Period Using (Dollars in thousands) Fair Value December 31, 2016 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Investment securities, available-for-sale U.S. government and federal agency $ 39,407 — 39,407 — U.S. government sponsored enterprises 19,570 — 19,570 — State and local governments 786,373 — 786,373 — Corporate bonds 471,951 — 471,951 — Residential mortgage-backed securities 1,007,515 — 1,007,515 — Commercial mortgage-backed securities 100,661 — 100,661 — Total assets measured at fair value on a recurring basis $ 2,425,477 — 2,425,477 — Interest rate swaps $ 14,725 — 14,725 — Total liabilities measured at fair value on a recurring basis $ 14,725 — 14,725 — Non-recurring Measurements The following is a description of the inputs and valuation methodologies used for assets recorded at fair value on a non-recurring basis, as well as the general classification of such assets pursuant to the valuation hierarchy. There have been no significant changes in the valuation techniques during the period ended September 30, 2017 . Other real estate owned: OREO is carried at the lower of fair value at acquisition date or current estimated fair value, less estimated cost to sell. Estimated fair value of OREO is based on appraisals or evaluations (new or updated). OREO is classified within Level 3 of the fair value hierarchy. Collateral-dependent impaired loans, net of ALLL: loans included in the Company’s loan portfolio for which it is probable that the Company will not collect all principal and interest due according to contractual terms are considered impaired. Estimated fair value of collateral-dependent impaired loans is based on the fair value of the collateral, less estimated cost to sell. Collateral-dependent impaired loans are classified within Level 3 of the fair value hierarchy. The Company’s credit departments review appraisals for OREO and collateral-dependent loans, giving consideration to the highest and best use of the collateral. The appraisal or evaluation (new or updated) is considered the starting point for determining fair value. The valuation techniques used in preparing appraisals or evaluations (new or updated) include the cost approach, income approach, sales comparison approach, or a combination of the preceding valuation techniques. The key inputs used to determine the fair value of the collateral-dependent loans and OREO include selling costs, discounted cash flow rate or capitalization rate, and adjustment to comparables. Valuations and significant inputs obtained by independent sources are reviewed by the Company for accuracy and reasonableness. The Company also considers other factors and events in the environment that may affect the fair value. The appraisals or evaluations (new or updated) are reviewed at least quarterly and more frequently based on current market conditions, including deterioration in a borrower’s financial condition and when property values may be subject to significant volatility. After review and acceptance of the collateral appraisal or evaluation (new or updated), adjustments to the impaired loan or OREO may occur. The Company generally obtains appraisals or evaluations (new or updated) annually. The following tables disclose the fair value measurement of assets with a recorded change during the period resulting from re-measuring the assets at fair value on a non-recurring basis: Fair Value Measurements At the End of the Reporting Period Using (Dollars in thousands) Fair Value September 30, 2017 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Other real estate owned $ 1,616 — — 1,616 Collateral-dependent impaired loans, net of ALLL 6,442 — — 6,442 Total assets measured at fair value on a non-recurring basis $ 8,058 — — 8,058 Fair Value Measurements At the End of the Reporting Period Using (Dollars in thousands) Fair Value December 31, 2016 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Other real estate owned $ 7,839 — — 7,839 Collateral-dependent impaired loans, net of ALLL 5,664 — — 5,664 Total assets measured at fair value on a non-recurring basis $ 13,503 — — 13,503 Non-recurring Measurements Using Significant Unobservable Inputs (Level 3) The following tables present additional quantitative information about assets measured at fair value on a non-recurring basis and for which the Company has utilized Level 3 inputs to determine fair value: Fair Value September 30, 2017 Quantitative Information about Level 3 Fair Value Measurements (Dollars in thousands) Valuation Technique Unobservable Input Range (Weighted-Average) 1 Other real estate owned $ 1,616 Sales comparison approach Selling costs 8.0% - 10.0% (9.3%) Collateral-dependent impaired loans, net of ALLL $ 17 Cost approach Selling costs 20.0% - 20.0% (20.0%) 3,020 Sales comparison approach Selling costs 6.0% - 10.0% (9.2%) 3,405 Combined approach Selling costs 10.0% - 10.0% (10.0%) Adjustment to comparables 20.0% - 20.0% (20.0%) $ 6,442 Fair Value December 31, 2016 Quantitative Information about Level 3 Fair Value Measurements (Dollars in thousands) Valuation Technique Unobservable Input Range (Weighted-Average) 1 Other real estate owned $ 7,767 Sales comparison approach Selling costs 6.0% - 10.0% (6.9%) Adjustment to comparables 0.0% - 10.0% (0.1%) 72 Combined approach Selling costs 10.0% - 10.0% (10.0%) Adjustment to comparables 10.0% - 10.0% (10.0%) $ 7,839 Collateral-dependent impaired loans, net of ALLL $ 110 Cost approach Selling costs 6.0% - 20.0% (6.6%) 1,982 Sales comparison approach Selling costs 8.0% - 10.0% (9.6%) 3,572 Combined approach Selling costs 10.0% - 10.0% (10.0%) Adjustment to comparables 20.0% - 20.0% (20.0%) $ 5,664 __________ 1 The range for selling costs and adjustments to comparables indicate reductions to the fair value. Fair Value of Financial Instruments The following is a description of the methods used to estimate the fair value of all other assets and liabilities recognized at amounts other than fair value. Cash and cash equivalents: fair value is estimated at book value. Investment securities, held-to-maturity: fair value for held-to-maturity securities is estimated in the same manner as available-for-sale securities, which is described above. Loans held for sale: fair value is estimated at book value. Loans receivable, net of ALLL: fair value is estimated by discounting the future cash flows using the rates at which similar notes would be written for the same remaining maturities. The market rates used are based on current rates the Company would impose for similar loans and reflect a market participant assumption about risks associated with non-performance, illiquidity, and the structure and term of the loans along with local economic and market conditions. Estimated fair value of impaired loans is based on the fair value of the collateral, less estimated cost to sell, or the present value of the loan’s expected future cash flows (discounted at the loan’s effective interest rate). All impaired loans are classified as Level 3 and all other loans are classified as Level 2 within the valuation hierarchy. Accrued interest receivable: fair value is estimated at book value. Non-marketable equity securities: fair value is estimated at book value due to restrictions that limit the sale or transfer of such securities. Deposits: fair value of term deposits is estimated by discounting the future cash flows using rates of similar deposits with similar maturities. The market rates used were obtained from an independent third party and reviewed by the Company. The rates were the average of current rates offered by the Company’s local competitors. The estimated fair value of demand, NOW, savings, and money market deposits is the book value since rates are regularly adjusted to market rates and transactions are executed at book value daily. Therefore, such deposits are classified in Level 1 of the valuation hierarchy. Certificate accounts and wholesale deposits are classified as Level 2 within the hierarchy. Federal Home Loan Bank advances: fair value of non-callable FHLB advances is estimated by discounting the future cash flows using rates of similar advances with similar maturities. Such rates were obtained from current rates offered by FHLB. The estimated fair value of callable FHLB advances was obtained from FHLB and the model was reviewed by the Company. Securities sold under agreements to repurchase and other borrowed funds: fair value of term repurchase agreements and other term borrowings is estimated based on current repurchase rates and borrowing rates currently available to the Company for repurchases and borrowings with similar terms and maturities. The estimated fair value for overnight repurchase agreements and other borrowings is book value. Subordinated debentures: fair value of the subordinated debt is estimated by discounting the estimated future cash flows using current estimated market rates. The market rates used were averages of currently traded trust preferred securities with similar characteristics to the Company’s issuances and obtained from an independent third party. Accrued interest payable: fair value is estimated at book value. Off-balance sheet financial instruments: commitments to extend credit and letters of credit represent the principal categories of off-balance sheet financial instruments. Rates for these commitments are set at time of loan closing, such that no adjustment is necessary to reflect these commitments at market value. The Company has an insignificant amount of off-balance sheet financial instruments. The following tables present the carrying amounts, estimated fair values and the level within the fair value hierarchy of the Company’s financial instruments: Fair Value Measurements At the End of the Reporting Period Using (Dollars in thousands) Carrying Amount September 30, 2017 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Financial assets Cash and cash equivalents $ 220,210 220,210 — — Investment securities, available-for-sale 1,886,517 — 1,886,517 — Investment securities, held-to-maturity 655,128 — 671,198 — Loans held for sale 48,709 48,709 — — Loans receivable, net of ALLL 6,379,857 — 6,172,843 118,816 Accrued interest receivable 50,492 50,492 — — Non-marketable equity securities 21,890 — 21,890 — Total financial assets $ 9,262,803 319,411 8,752,448 118,816 Financial liabilities Deposits $ 7,767,154 6,735,130 1,035,141 — FHLB advances 153,685 — 153,814 — Repurchase agreements and other borrowed funds 461,839 — 461,839 — Subordinated debentures 126,099 — 90,845 — Accrued interest payable 3,154 3,154 — — Interest rate swaps 12,748 — 12,748 — Total financial liabilities $ 8,524,679 6,738,284 1,754,387 — Fair Value Measurements At the End of the Reporting Period Using (Dollars in thousands) Carrying Amount December 31, 2016 Quoted Prices Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Financial assets Cash and cash equivalents $ 152,541 152,541 — — Investment securities, available-for-sale 2,425,477 — 2,425,477 — Investment securities, held-to-maturity 675,674 — 689,089 — Loans held for sale 72,927 72,927 — — Loans receivable, net of ALLL 5,554,891 — 5,380,286 123,382 Accrued interest receivable 45,832 45,832 — — Non-marketable equity securities 25,550 — 25,550 — Total financial assets $ 8,952,892 271,300 8,520,402 123,382 Financial liabilities Deposits $ 7,372,279 6,090,879 1,283,532 — FHLB advances 251,749 — 257,643 — Repurchase agreements and other borrowed funds 478,090 — 478,090 — Subordinated debentures 125,991 — 85,557 — Accrued interest payable 3,584 3,584 — — Interest rate swaps 14,725 — 14,725 — Total financial liabilities $ 8,246,418 6,094,463 2,119,547 —

Mergers and Acquisitions

Mergers and Acquisitions	9 Months Ended
	Sep. 30, 2017
Business Combinations [Abstract]
Mergers and Acquisitions	Mergers and Acquisitions On April 30, 2017 , the Company acquired 100 percent of the outstanding common stock of TFB Bancorp, Inc. and its wholly-owned subsidiary, The Foothills Bank, a community bank based in Yuma, Arizona. Foothills provides banking services to individuals and businesses in Arizona, with banking offices located in Yuma, Prescott and Casa Grande, Arizona. The acquisition expands the Company’s market into the state of Arizona and further diversifies the Company’s loan, customer and deposit base. Foothills merged into Glacier Bank and operates as a separate Bank division under its existing name and management team. The Foothills acquisition was valued at $64,015,000 and resulted in the Company issuing 1,381,661 shares of its common stock and $17,342,000 in cash in exchange for all of Foothills’ outstanding common stock shares. The fair value of the Company shares issued was determined on the basis of the closing market price of the Company’s common stock on the April 30, 2017 acquisition date. The excess of the fair value of consideration transferred over total identifiable net assets was recorded as goodwill. The goodwill arising from the acquisition consists largely of the synergies and economies of scale expected from combining the operations of the Company and Foothills. None of the goodwill is deductible for income tax purposes as the acquisition was accounted for as a tax-free exchange. The assets and liabilities of Foothills were recorded on the Company’s consolidated statements of financial condition at their estimated fair values as of the April 30, 2017 acquisition date and Foothills’ results of operations have been included in the Company’s consolidated statements of operations since that date. The following table discloses the calculation of the fair value of the consideration transferred, the total identifiable net assets acquired and the resulting goodwill arising from the Foothills acquisition: (Dollars in thousands) April 30, Fair value of consideration transferred Fair value of Company shares issued, net of equity issuance costs $ 46,673 Cash consideration for outstanding shares 17,342 Contingent consideration — Total fair value of consideration transferred 64,015 Recognized amounts of identifiable assets acquired and liabilities assumed Identifiable assets acquired Cash and cash equivalents 13,251 Investment securities 25,420 Loans receivable 292,529 Core deposit intangible 1 4,331 Accrued income and other assets 19,699 Total identifiable assets acquired 355,230 Liabilities assumed Deposits 296,760 FHLB advances 22,800 Accrued expenses and other liabilities 2,264 Total liabilities assumed 321,824 Total identifiable net assets 33,406 Goodwill recognized $ 30,609 __________ 1 The core deposit intangible for this acquisition was determined to have an estimated life of 10 years . The fair value of the Foothills assets acquired includes loans with fair values of $292,529,000 and the gross principal and contractual interest due under the Foothills contracts is $303,527,000 . The Company evaluated the principal and contractual interest due at the acquisition date and determined that an insignificant amount is not expected to be collectible. The Company incurred $877,000 of third-party acquisition-related costs in connection with the Foothills acquisition during the nine months ended September 30, 2017 . The expenses are primarily included in other expense in the Company's consolidated statements of operations. Total income consisting of net interest income and non-interest income of the acquired operations of Foothills was approximately $8,579,000 and net income was approximately $1,853,000 from April 30, 2017 to September 30, 2017 . The following unaudited pro forma summary presents consolidated information of the Company as if the Foothills acquisition had occurred on January 1, 2016: Three Months ended Nine Months ended (Dollars in thousands) September 30, September 30, September 30, September 30, Net interest income and non-interest income $ 119,997 110,969 345,068 324,277 Net income 36,479 32,217 99,231 93,005

Subsequent Event

Subsequent Event	9 Months Ended
	Sep. 30, 2017
Subsequent Events [Abstract]
Subsequent Event	Subsequent Event On October 26, 2017, the Company announced the signing of a definitive agreement to acquire Inter-Mountain Bancorp, Inc. and its wholly-owned subsidiary, First Security Bank, a community bank based in Bozeman, Montana (collectively, “FSB”). FSB provides banking services to individuals and businesses throughout Montana with banking offices located in Bozeman, Belgrade, Big Sky, Choteau, Fairfield, Fort Benton, Three Forks, Vaughn and West Yellowstone. As of September 30, 2017, FSB had total assets of $1,009,623,000 , gross loans of $657,626,000 and total deposits of $873,572,000 . Upon closing of the transaction, which is anticipated to take place in the first quarter of 2018, FSB will become a new Bank division headquartered in Bozeman. Big Sky Western Bank, the Bank’s existing Bozeman-based division will combine with the new FSB division. The agriculture-focused northern branches of FSB, located in the area known as the Golden Triangle, will combine with the Bank’s First Bank of Montana division.

Nature of Operations and Summ22

Nature of Operations and Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
General	General Glacier Bancorp, Inc. (“Company”) is a Montana corporation headquartered in Kalispell, Montana. The Company provides a full range of banking services to individuals and businesses in Montana, Idaho, Utah, Washington, Wyoming, Colorado and Arizona through its wholly-owned bank subsidiary, Glacier Bank (“Bank”). The Company offers a wide range of banking products and services, including transaction and savings deposits, real estate, commercial, agriculture and consumer loans and mortgage origination services. The Company serves individuals, small to medium-sized businesses, community organizations and public entities. In the opinion of management, the accompanying unaudited condensed consolidated financial statements contain all adjustments (consisting of normal recurring adjustments) necessary for a fair presentation of the Company’s financial condition as of September 30, 2017 , the results of operations and comprehensive income for the three and nine month periods ended September 30, 2017 and 2016 , and changes in stockholders’ equity and cash flows for the nine month periods ended September 30, 2017 and 2016 . The condensed consolidated statement of financial condition of the Company as of December 31, 2016 has been derived from the audited consolidated statements of the Company as of that date. The accompanying unaudited condensed consolidated financial statements do not include all of the information and footnotes required by accounting principles generally accepted in the United States of America (“GAAP”) for complete financial statements. These unaudited condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and notes thereto contained in the Company’s Annual Report on Form 10-K for the year ended December 31, 2016 . Operating results for the nine months ended September 30, 2017 are not necessarily indicative of the results anticipated for the year ending December 31, 2017 . The Company is a defendant in legal proceedings arising in the normal course of business. In the opinion of management, the disposition of pending litigation will not have a material affect on the Company’s consolidated financial position, results of operations or liquidity. Material estimates that are particularly susceptible to significant change include: 1) the determination of the allowance for loan and lease losses (“ALLL” or “allowance”); 2) the valuation of investment securities; 3) the valuation of real estate acquired in connection with foreclosures or in satisfaction of loans; and 4) the evaluation of goodwill impairment. For the determination of the ALLL and real estate valuation estimates, management obtains independent appraisals (new or updated) for significant items. Estimates relating to investment valuations are obtained from independent third parties. Estimates relating to the evaluation of goodwill for impairment are determined based on internal calculations using significant independent party inputs.
Principles of Consolidation	Principles of Consolidation The consolidated financial statements of the Company include the parent holding company and the Bank. The Bank consists of fourteen bank divisions, a treasury division, an information technology division and a centralized mortgage division. The treasury division includes the Bank’s investment portfolio and wholesale borrowings, the information technology division includes the Bank’s internal data processing, and the centralized mortgage division includes mortgage loan servicing and secondary market sales. The Bank divisions operate under separate names, management teams and advisory directors. The Company considers the Bank to be its sole operating segment as the Bank 1) engages in similar bank business activity from which it earns revenues and incurs expenses; 2) the operating results of the Bank are regularly reviewed by the Chief Executive Officer (i.e., the chief operating decision maker) who makes decisions about resources to be allocated to the Bank; and 3) financial information is available for the Bank. All significant inter-company transactions have been eliminated in consolidation. The Bank has subsidiary interests in variable interest entities (“VIE”) for which the Bank has both the power to direct the VIE’s significant activities and the obligation to absorb losses or right to receive benefits of the VIE that could potentially be significant to the VIE. These subsidiary interests are included in the Company’s consolidated financial statements. The parent holding company also owns non-bank subsidiaries that have issued trust preferred securities as Tier 1 capital instruments. The trust subsidiaries are not included in the Company’s consolidated financial statements. The Company's investments in the trust subsidiaries are included in non-marketable equity securities on the Company's statement of financial condition. In April 2017, the Company completed its acquisition of TFB Bancorp, Inc. and its wholly-owned subsidiary, The Foothills Bank, a community bank based in Yuma, Arizona (collectively, “Foothills”). In August 2016, the Company completed its acquisition of Treasure State Bank, a community bank based in Missoula, Montana. The transactions were accounted for using the acquisition method, and their results of operations have been included in the Company’s consolidated financial statements as of the acquisition dates. Pending Acquisition In June 2017, the Company announced the signing of a definitive agreement to acquire Columbine Capital Corp., and its wholly-owned subsidiary, Collegiate Peaks Bank, a community bank based in Buena Vista, Colorado (collectively, “Collegiate”). Collegiate provides banking services to businesses and individuals in the Mountain and Front Range communities of Colorado, with banking offices located in Aurora, Buena Vista, Denver and Salida. As of September 30, 2017, Collegiate had total assets of $536,387,000 , gross loans of $331,486,000 and total deposits of $460,380,000 . The acquisition is subject to required regulatory approvals and other customary conditions of closing and is expected to be completed during the first quarter of 2018. Upon closing of the transaction, Collegiate will be merged into Glacier Bank and will operate as a separate bank division under its existing name and management team.
Loans Receivable	Loans Receivable Loans that are intended to be held-to-maturity are reported at the unpaid principal balance less net charge-offs and adjusted for deferred fees and costs on originated loans and unamortized premiums or discounts on acquired loans. Fees and costs on originated loans and premiums or discounts on acquired loans are deferred and subsequently amortized or accreted as a yield adjustment over the expected life of the loan utilizing the interest method. The objective of the interest method is to calculate periodic interest income at a constant effective yield. When a loan is paid off prior to maturity, the remaining fees and costs on originated loans and premiums or discounts on acquired loans are immediately recognized into interest income. The Company’s loan segments, which are based on the purpose of the loan, include residential real estate, commercial, and consumer loans. The Company’s loan classes, a further disaggregation of segments, include residential real estate loans (residential real estate segment), commercial real estate and other commercial loans (commercial segment), and home equity and other consumer loans (consumer segment). Loans that are thirty days or more past due based on payments received and applied to the loan are considered delinquent. Loans are designated non-accrual and the accrual of interest is discontinued when the collection of the contractual principal or interest is unlikely. A loan is typically placed on non-accrual when principal or interest is due and has remained unpaid for ninety days or more. When a loan is placed on non-accrual status, interest previously accrued but not collected is reversed against current period interest income. Subsequent payments on non-accrual loans are applied to the outstanding principal balance if doubt remains as to the ultimate collectability of the loan. Interest accruals are not resumed on partially charged-off impaired loans. For other loans on nonaccrual, interest accruals are resumed on such loans only when they are brought fully current with respect to interest and principal and when, in the judgment of management, the loans are estimated to be fully collectible as to both principal and interest. The Company considers impaired loans to be the primary credit quality indicator for monitoring the credit quality of the loan portfolio. Loans are designated impaired when, based upon current information and events, it is probable that the Company will be unable to collect the scheduled payments of principal or interest when due according to the contractual terms of the loan agreement and, therefore, the Company has serious doubts as to the ability of such borrowers to fulfill the contractual obligation. Impaired loans include non-performing loans (i.e., non-accrual loans and accruing loans ninety days or more past due) and accruing loans under ninety days past due where it is probable payments will not be received according to the loan agreement (e.g., troubled debt restructuring). Interest income on accruing impaired loans is recognized using the interest method. The Company measures impairment on a loan-by-loan basis in the same manner for each class within the loan portfolio. An insignificant delay or shortfall in the amounts of payments would not cause a loan or lease to be considered impaired. The Company determines the significance of payment delays and shortfalls on a case-by-case basis, taking into consideration all of the facts and circumstances surrounding the loan and the borrower, including the length and reasons for the delay, the borrower’s prior payment record, and the amount of the shortfall in relation to the principal and interest due. A restructured loan is considered a troubled debt restructuring (“TDR”) if the creditor, for economic or legal reasons related to the debtor’s financial difficulties, grants a concession to the debtor that it would not otherwise consider. The Company periodically enters into restructure agreements with borrowers whereby the loans were previously identified as TDRs. When such circumstances occur, the Company carefully evaluates the facts of the subsequent restructure to determine the appropriate accounting and under certain circumstances it may be acceptable not to account for the subsequently restructured loan as a TDR. When assessing whether a concession has been granted by the Company, any prior forgiveness on a cumulative basis is considered a continuing concession. A TDR loan is considered an impaired loan and a specific valuation allowance is established when the fair value of the collateral-dependent loan or present value of the loan’s expected future cash flows (discounted at the loan’s effective interest rate based on the original contractual rate) is lower than the carrying value of the impaired loan. The Company has made the following types of loan modifications, some of which were considered a TDR: • reduction of the stated interest rate for the remaining term of the debt; • extension of the maturity date(s) at a stated rate of interest lower than the current market rate for newly originated debt having similar risk characteristics; and • reduction of the face amount of the debt as stated in the debt agreements. The Company recognizes that while borrowers may experience deterioration in their financial condition, many continue to be creditworthy customers who have the willingness and capacity for debt repayment. In determining whether non-restructured or unimpaired loans issued to a single or related party group of borrowers should continue to accrue interest when the borrower has other loans that are impaired or are TDRs, the Company on a quarterly or more frequent basis performs an updated and comprehensive assessment of the willingness and capacity of the borrowers to timely and ultimately repay their total debt obligations, including contingent obligations. Such analysis takes into account current financial information about the borrowers and financially responsible guarantors, if any, including for example: • analysis of global, i.e., aggregate debt service for total debt obligations; • assessment of the value and security protection of collateral pledged using current market conditions and alternative market assumptions across a variety of potential future situations; and • loan structures and related covenants. For additional information relating to loans, see Note 3.
Allowance for Loan and Lease Losses	Allowance for Loan and Lease Losses Based upon management’s analysis of the Company’s loan portfolio, the balance of the ALLL is an estimate of probable credit losses known and inherent within the Bank’s loan portfolio as of the date of the consolidated financial statements. The ALLL is analyzed at the loan class level and is maintained within a range of estimated losses. Determining the adequacy of the ALLL involves a high degree of judgment and is inevitably imprecise as the risk of loss is difficult to quantify. The determination of the ALLL and the related provision for loan losses is a critical accounting estimate that involves management’s judgments about known relevant internal and external environmental factors that affect loan losses. The balance of the ALLL is highly dependent upon management’s evaluations of borrowers’ current and prospective performance, appraisals and other variables affecting the quality of the loan portfolio. Individually significant loans and major lending areas are reviewed periodically to determine potential problems at an early date. Changes in management’s estimates and assumptions are reasonably possible and may have a material impact upon the Company’s consolidated financial statements, results of operations or capital. Risk characteristics considered in the ALLL analysis applicable to each loan class within the Company's loan portfolio are as follows: Residential Real Estate. Residential real estate loans are secured by owner-occupied 1-4 family residences. Repayment of these loans is primarily dependent on the personal income and credit rating of the borrowers. Credit risk in these loans is impacted by economic conditions within the Company’s market areas that affect the value of the property securing the loans and affect the borrowers' personal incomes. Mitigating risk factors for this loan class include a large number of borrowers, geographic dispersion of market areas and the loans are originated for relatively smaller amounts. Commercial Real Estate . Commercial real estate loans typically involve larger principal amounts, and repayment of these loans is generally dependent on the successful operation of the property securing the loan and/or the business conducted on the property securing the loan. Credit risk in these loans is impacted by the creditworthiness of a borrower, valuation of the property securing the loan and conditions within the local economies in the Company’s diverse, geographic market areas. Commercial . Commercial loans consist of loans to commercial customers for use in financing working capital needs, equipment purchases and business expansions. The loans in this category are repaid primarily from the cash flow of a borrower’s principal business operation. Credit risk in these loans is driven by creditworthiness of a borrower and the economic conditions that impact the cash flow stability from business operations across the Company’s diverse, geographic market areas. Home Equity . Home equity loans consist of junior lien mortgages and first and junior lien lines of credit (revolving open-end and amortizing closed-end) secured by owner-occupied 1-4 family residences. Repayment of these loans is primarily dependent on the personal income and credit rating of the borrowers. Credit risk in these loans is impacted by economic conditions within the Company’s market areas that affect the value of the residential property securing the loans and affect the borrowers' personal incomes. Mitigating risk factors for this loan class are a large number of borrowers, geographic dispersion of market areas and the loans are originated for terms that range from 10 to 15 years . Other Consumer . The other consumer loan portfolio consists of various short-term loans such as automobile loans and loans for other personal purposes. Repayment of these loans is primarily dependent on the personal income of the borrowers. Credit risk is driven by consumer economic factors (such as unemployment and general economic conditions in the Company’s diverse, geographic market area) and the creditworthiness of a borrower. The ALLL consists of a specific valuation allowance component and a general valuation allowance component. The specific component relates to loans that are determined to be impaired and individually evaluated for impairment. The Company measures impairment on a loan-by-loan basis based on the present value of expected future cash flows discounted at the loan’s effective interest rate, except when it is determined that repayment of the loan is expected to be provided solely by the underlying collateral. For impairment based on expected future cash flows, the Company considers all information available as of a measurement date, including past events, current conditions, potential prepayments, and estimated cost to sell when such costs are expected to reduce the cash flows available to repay or otherwise satisfy the loan. For alternative ranges of cash flows, the likelihood of the possible outcomes is considered in determining the best estimate of expected future cash flows. The effective interest rate for a loan restructured in a TDR is based on the original contractual rate. For collateral-dependent loans and real estate loans for which foreclosure or a deed-in-lieu of foreclosure is probable, impairment is measured by the fair value of the collateral, less estimated cost to sell. The fair value of the collateral is determined primarily based upon appraisal or evaluation of the underlying real property value. The general valuation allowance component relates to probable credit losses inherent in the balance of the loan portfolio based on historical loss experience, adjusted for changes in trends and conditions of qualitative or environmental factors. The historical loss experience is based on the previous twelve quarters loss experience by loan class adjusted for risk characteristics in the existing loan portfolio. The same trends and conditions are evaluated for each class within the loan portfolio; however, the risk characteristics are weighted separately at the individual class level based on the Company’s judgment and experience. The changes in trends and conditions evaluated for each class within the loan portfolio include the following: • Changes in lending policies and procedures, including changes in underwriting standards and collection, charge-off, and recovery practices not considered elsewhere in estimating credit losses; • Changes in global, national, regional, and local economic and business conditions and developments that affect the collectability of the portfolio, including the condition of various market segments; • Changes in the nature and volume of the portfolio and in the terms of loans; • Changes in experience, ability, and depth of lending management and other relevant staff; • Changes in the volume and severity of past due and nonaccrual loans; • Changes in the quality of the Company’s loan review system; • Changes in the value of underlying collateral for collateral-dependent loans; • The existence and effect of any concentrations of credit, and changes in the level of such concentrations; and • The effect of other external factors such as competition and legal and regulatory requirements on the level of estimated credit losses in the Company’s existing portfolio. The ALLL is increased by provisions for loan losses which are charged to expense. The portions of loan balances determined by management to be uncollectible are charged off as a reduction of the ALLL and recoveries of amounts previously charged off are credited as an increase to the ALLL. The Company’s charge-off policy is consistent with bank regulatory standards. Consumer loans generally are charged off when the loan becomes over 120 days delinquent. Real estate acquired as a result of foreclosure or by deed-in-lieu of foreclosure is classified as real estate owned until such time as it is sold. At acquisition date, the assets and liabilities of acquired banks are recorded at their estimated fair values which results in no ALLL carried over from acquired banks. Subsequent to acquisition, an allowance will be recorded on the acquired loan portfolios for further credit deterioration, if any.
Reclassifications	Reclassifications Certain reclassifications have been made to the 2016 financial statements to conform to the 2017 presentation.
Impact of Recent Authoritative Accounting Guidance	Impact of Recent Authoritative Accounting Guidance The Accounting Standards Codification ™ (“ASC”) is the Financial Accounting Standards Board’s (“FASB”) officially recognized source of authoritative GAAP applicable to all public and non-public non-governmental entities. Rules and interpretive releases of the Securities and Exchange Commission (“SEC”) under the authority of the federal securities laws are also sources of authoritative GAAP for the Company as an SEC registrant. All other accounting literature is non-authoritative. The following paragraphs provide descriptions of recently adopted or newly issued but not yet effective accounting standards that could have a material effect on the Company’s financial position or results of operations. In August 2017, FASB amended FASB ASC Topic 815, Derivatives and Hedging . The objective of the amendments were to improve the financial reporting of hedging relationships to better portray the economic results of an entity’s risk management activities in its financial statements. In addition, the amendments made targeted improvements to simplify the application of the hedge accounting guidance. The amendments are effective for public business entities for the first interim and annual reporting periods beginning after December 15, 2018 and early adoption is permitted. The Company is currently evaluating the full impact of the amendments on its existing interest rate swaps and whether it will early adopt. The Company does not expect there to be an impact to the Company’s financial position and results of operations, although, there may be additional financial statement disclosures. The accounting policies and procedures will be modified after the Company has fully evaluated the standard, although significant changes are not expected. In March 2017, FASB amended FASB ASC Subtopic 310-20, Receivables-Nonrefundable Fees and Other Costs. The amendments in the Update shorten the amortization period for certain callable debt securities held at a premium. Specifically, the amendments require the premium to be amortized to the earliest call date instead of the maturity date. The amendments do not require an accounting change for securities held at a discount; the discount continues to be amortized to maturity. The amendments are effective for public business entities for the first interim and annual reporting periods beginning after December 15, 2018. Early adoption is permitted and if adopted in an interim period, any adjustments should be reflected as of the beginning of the year that includes the interim period. The entity should apply the amendments on a modified retrospective basis through a cumulative-effective adjustment directly to retained earnings as of the beginning of the period of adoption. The Company has premiums on debt securities that are currently being amortized to the maturity date, primarily in the state and local governments category. The Company is currently evaluating the amount of the premium associated with debt securities that will be impacted by the amendments, the impact the amendments will have to the Company’s financial position and results of operations, and whether it will early adopt. The accounting policies and procedures will be modified after the Company has fully evaluated the standard, although significant changes are not expected. In January 2017, FASB amended FASB ASC Topic 350, Simplifying the Test for Goodwill. The amendments in the Update simplify the measurement of goodwill by eliminating Step 2 from the goodwill impairment test. Instead, under these amendments, an entity should perform its annual, or interim, goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount. An entity should recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value; however, the loss should not exceed the total amount of goodwill allocated to that reporting unit. The amendments are effective for public business entities for the first interim and annual reporting periods beginning after December 15, 2019. Early adoption is permitted for interim or annual goodwill impairment tests performed on testing dates after January 1, 2017. The Company has goodwill from prior business combinations and performs an annual impairment test or more frequently if changes or circumstances occur that would more-likely-than-not reduce the fair value of the reporting unit below its carrying value. During the third quarter of 2017, the Company performed its impairment assessment and determined the fair value of the aggregated reporting units exceed the carrying value, such that the Company’s goodwill was not considered impaired. Although the Company cannot anticipate future goodwill impairment assessments, based on the most recent assessment, it is unlikely that an impairment amount would need to be calculated and, therefore, the Company does not anticipate a material impact from these amendments to the Company’s financial position and results of operations. The current accounting policies and processes are not anticipated to change, except for the elimination of the Step 2 analysis. For additional information regarding goodwill impairment testing, see Note 4. In June 2016, FASB amended FASB ASC Topic 326, Financial Instruments - Credit Losses. The amendments in this Update replace the incurred loss model with a methodology that reflects expected credit losses over the life of the loan and requires consideration of a broader range of reasonable and supportable information to calculate credit loss estimates. The amendments are effective for public business entities for the first interim and annual reporting periods beginning after December 15, 2019. The Company is currently evaluating the impact of these amendments to the Company’s financial position and results of operations and currently does not know or cannot reasonably quantify the impact of the adoption of the amendments as a result of the complexity and extensive changes from the amendments. The ALLL is a material estimate of the Company and given the change from an incurred loss model to a methodology that considers the credit loss over the life of the loan, there is the potential for an increase in the ALLL at adoption date. The Company is anticipating a significant change in the processes and procedures to calculate the ALLL, including changes in assumptions and estimates to consider expected credit losses over the life of the loan versus the current accounting practice that utilizes the incurred loss model. The Company will also develop new procedures for determining an allowance for credit losses relating to held-to-maturity investment securities. In addition, the current accounting policy and procedures for other-than-temporary impairment on available-for-sale investment securities will be replaced with an allowance approach. The Company has formed a project team and is actively reviewing the standard for developing and implementing processes and procedures during the next two years to ensure it is fully compliant with the amendments at adoption date. For additional information on the allowance for loan losses, see Note 3. In March 2016, FASB amended FASB ASC Topic 718, Compensation - Stock Compensation. The amendments in this Update address certain aspects of the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and classification of awards on the statement of cash flows. The amendments were effective for public business entities for the first interim and annual reporting periods beginning after December 15, 2016 and the Company adopted the amendments as of January 1, 2017. The amendments require entities to recognize all income tax effects related to share-based payment awards in the statement of operations when the awards vest or are settled. Previously, income tax benefits at the settlement of awards were reported as increases (or decreases) to additional paid-in capital to the extent that those benefits were greater than (or less than) the income tax benefits recognized in earnings during the awards’ vesting periods. Such amounts are to be classified as an operating activity in the statement of cash flows instead of the prior accounting treatment, which required it to be classified as both an operating and a financing activity. The Company has elected to apply this classification change on a retrospective basis. Also in connection with the adoption of the Update, the Company has elected to change its accounting policy to recognize forfeitures as they occur. The requirement to report income tax effects in earnings has been applied to the settlement of awards on a prospective basis and the impact of applying the guidance reduced reported income tax expense for the nine month period ended September 30, 2017 by $555,000 , or approximately $0.01 per diluted common share. The implementation of the remaining provisions of the Update did not have a significant impact on the Company’s consolidated financial statements. In February 2016, FASB amended FASB ASC Topic 842, Leases. The amendments in this Update address several aspects of lease accounting with the significant change being the recognition of lease assets and lease liabilities for leases previously classified as operating leases. The amendments are effective for public business entities for the first interim and annual reporting periods beginning after December 15, 2018, and early adoption is permitted. The Company has several lease agreements for which the amendments will require the Company to recognize a lease liability to make lease payments and a right-of-use asset which will represent its right to use the underlying asset for the lease term. The Company is currently reviewing the amendments to ensure it is fully compliant by the adoption date and doesn’t expect to early adopt. As permitted by the amendments, the Company is anticipating electing an accounting policy to not recognize lease assets and lease liabilities for leases with a term of twelve months or less. The impact is not expected to have a material effect on the Company’s financial position or results of operations since the Company does not have a material amount of lease agreements. The Company is currently in the process of fully evaluating the amendments and will subsequently implement new processes which are not expected to significantly change since the Company already has processes for certain lease agreements that recognize the lease assets and lease liabilities. In addition, the Company will change its current accounting policies to comply with the amendments with such changes as mentioned above. In January 2016, FASB amended FASB ASC Topic 825, Financial Instruments. The amendments in this Update address certain aspects of recognition, measurement, presentation, and disclosure of financial instruments. The amendments are effective for public business entities for the first interim and annual reporting periods beginning after December 15, 2017. Early adoption is only permitted under certain circumstances outlined in the amendments. A reporting entity should apply the amendments by means of a cumulative-effect adjustment to the Company’s statement of financial condition as of the beginning of the reporting year of adoption. The amendments will impact the Company in a few areas including requiring equity investments (with certain exclusions) to be measured at fair value with the changes recognized in net income, requirement to utilize an exit price when measuring the fair value of financial instruments, additional disclosures related to other comprehensive income, evaluation of a valuation allowance on a deferred tax asset related to available-for-sale investment securities in combination with the entity’s other deferred tax assets, and other disclosure changes. The Company is currently evaluating the impact of these amendments, but does not expect them to have a material material effect on the Company’s financial position or results of operations since it does not have a material amount of equity securities or a valuation allowance. However, the amendments will have an impact on certain items that are disclosed at fair value that are not currently utilizing the exit price notion when measuring fair value. As of September 30, 2017 , the Company cannot quantify the change in the fair value of such disclosures since the Company is currently evaluating the full impact of the Update. The Company is actively developing appropriate procedures and processes to comply with the disclosure requirements of such amendments. The current accounting policies and procedures will be modified after the Company has fully evaluated the standard to comply with the accounting changes mentioned above. In May 2014, FASB amended FASB ASC Topic 606, Revenue from Contracts with Customers. The amendments clarify the principles for recognizing revenue and develop a common revenue standard among industries. The new guidance establishes the following core principle: recognize revenue to depict 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 goods or services. Five steps are provided for a company or organization to follow to achieve such core principle. The new guidance also includes a cohesive set of disclosure requirements that will provide users of financial statements with comprehensive information about the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers. The entity should apply the amendments using one of two retrospective methods described in the amendment. Accounting Standards Update No. 2015-14, Revenue from Contracts with Customers (Topic 606) delayed the effective date for public entities to annual reporting periods beginning after December 15, 2017, including interim reporting periods within that reporting period. Several subsequent amendments have been issued that provide clarifying guidance and are effective with the adoption of the original Update. The Company continues to evaluate the standard and the impact of these amendments, although it doesn’t expect the amendments to have a significant impact to the Company’s financial position, results of operation, or disclosures. The amendments could potentially impact the accounting procedures and processes over the recognition of certain revenue sources, including, but not limited to, non-interest income. The Company is actively documenting its evaluation of the standard and developing processes and procedures to ensure it is fully compliant with these amendments at the date of adoption.

Investment Securities (Tables)

Investment Securities (Tables)	9 Months Ended
	Sep. 30, 2017
Investments, Debt and Equity Securities [Abstract]
Amortized cost, gross unrealized gains and losses and fair value of investment securities	The following tables present the amortized cost, the gross unrealized gains and losses and the fair value of the Company’s investment securities: September 30, 2017 Amortized Cost Gross Unrealized Fair Value (Dollars in thousands) Gains Losses Available-for-sale U.S. government and federal agency $ 34,161 45 (160 ) 34,046 U.S. government sponsored enterprises 19,178 100 (11 ) 19,267 State and local governments 623,296 22,616 (3,939 ) 641,973 Corporate bonds 248,865 1,281 (156 ) 249,990 Residential mortgage-backed securities 837,808 3,703 (2,582 ) 838,929 Commercial mortgage-backed securities 102,843 214 (745 ) 102,312 Total available-for-sale 1,866,151 27,959 (7,593 ) 1,886,517 Held-to-maturity State and local governments 655,128 23,503 (7,433 ) 671,198 Total held-to-maturity 655,128 23,503 (7,433 ) 671,198 Total investment securities $ 2,521,279 51,462 (15,026 ) 2,557,715 December 31, 2016 Amortized Cost Gross Unrealized Fair Value (Dollars in thousands) Gains Losses Available-for-sale U.S. government and federal agency $ 39,554 15 (162 ) 39,407 U.S. government sponsored enterprises 19,557 55 (42 ) 19,570 State and local governments 775,395 20,941 (9,963 ) 786,373 Corporate bonds 471,569 1,175 (793 ) 471,951 Residential mortgage-backed securities 1,014,518 2,744 (9,747 ) 1,007,515 Commercial mortgage-backed securities 102,209 30 (1,578 ) 100,661 Total available-for-sale 2,422,802 24,960 (22,285 ) 2,425,477 Held-to-maturity State and local governments 675,674 21,400 (7,985 ) 689,089 Total held-to-maturity 675,674 21,400 (7,985 ) 689,089 Total investment securities $ 3,098,476 46,360 (30,270 ) 3,114,566
Amortized cost and fair value of securities by contractual maturity	The following table presents the amortized cost and fair value of available-for-sale and held-to-maturity securities by contractual maturity at September 30, 2017 . Actual maturities may differ from expected or contractual maturities since issuers have the right to prepay obligations with or without prepayment penalties. September 30, 2017 Available-for-Sale Held-to-Maturity (Dollars in thousands) Amortized Cost Fair Value Amortized Cost Fair Value Due within one year $ 83,120 83,270 — — Due after one year through five years 248,611 250,105 1,697 1,756 Due after five years through ten years 225,885 235,110 72,217 74,597 Due after ten years 367,884 376,791 581,214 594,845 925,500 945,276 655,128 671,198 Mortgage-backed securities 1 940,651 941,241 — — Total $ 1,866,151 1,886,517 655,128 671,198 __________ 1 Mortgage-backed securities, which have prepayment provisions, are not assigned to maturity categories due to fluctuations in their prepayment speeds.
Proceeds from sales and calls of investment securities and the associated gains and losses	Proceeds from sales and calls of investment securities and the associated gains and losses that have been included in earnings are listed below: Three Months ended Nine Months ended (Dollars in thousands) September 30, September 30, September 30, September 30, Available-for-sale Proceeds from sales and calls of investment securities $ 155,894 59,974 268,557 148,458 Gross realized gains 1 278 366 3,345 1,309 Gross realized losses 1 (201 ) (960 ) (3,864 ) (1,960 ) Held-to-maturity Proceeds from calls of investment securities 3,675 340 18,910 21,965 Gross realized gains 1 — — 153 91 Gross realized losses 1 — — (179 ) (146 ) __________ 1 The gain or loss on the sale or call of each investment security is determined by the specific identification method.
Summary of investments with an unrealized loss position	Investment securities with an unrealized loss position are summarized as follows: September 30, 2017 Less than 12 Months 12 Months or More Total (Dollars in thousands) Fair Value Unrealized Loss Fair Value Unrealized Loss Fair Value Unrealized Loss Available-for-sale U.S. government and federal agency $ 1,952 (18 ) 13,548 (142 ) 15,500 (160 ) U.S. government sponsored enterprises 3,460 (11 ) — — 3,460 (11 ) State and local governments 76,806 (932 ) 83,941 (3,007 ) 160,747 (3,939 ) Corporate bonds 48,048 (150 ) 3,270 (6 ) 51,318 (156 ) Residential mortgage-backed securities 350,965 (2,102 ) 38,751 (480 ) 389,716 (2,582 ) Commercial mortgage-backed securities 58,628 (707 ) 8,116 (38 ) 66,744 (745 ) Total available-for-sale $ 539,859 (3,920 ) 147,626 (3,673 ) 687,485 (7,593 ) Held-to-maturity State and local governments $ 10,683 (139 ) 104,858 (7,294 ) 115,541 (7,433 ) Total held-to-maturity $ 10,683 (139 ) 104,858 (7,294 ) 115,541 (7,433 ) December 31, 2016 Less than 12 Months 12 Months or More Total (Dollars in thousands) Fair Value Unrealized Loss Fair Value Unrealized Loss Fair Value Unrealized Loss Available-for-sale U.S. government and federal agency $ 6,718 (24 ) 26,239 (138 ) 32,957 (162 ) U.S. government sponsored enterprises 6,049 (42 ) — — 6,049 (42 ) State and local governments 222,700 (4,949 ) 81,783 (5,014 ) 304,483 (9,963 ) Corporate bonds 174,821 (774 ) 6,141 (19 ) 180,962 (793 ) Residential mortgage-backed securities 688,811 (9,079 ) 29,957 (668 ) 718,768 (9,747 ) Commercial mortgage-backed securities 89,298 (1,578 ) — — 89,298 (1,578 ) Total available-for-sale $ 1,188,397 (16,446 ) 144,120 (5,839 ) 1,332,517 (22,285 ) Held-to-maturity State and local governments $ 117,912 (1,712 ) 86,601 (6,273 ) 204,513 (7,985 ) Total held-to-maturity $ 117,912 (1,712 ) 86,601 (6,273 ) 204,513 (7,985 )

Loans Receivable, Net (Tables)

Loans Receivable, Net (Tables)	9 Months Ended
	Sep. 30, 2017
Receivables [Abstract]
Summary of loans receivable	The following table presents loans receivable for each portfolio class of loans: At or for the Nine Months ended At or for the Year ended (Dollars in thousands) September 30, December 31, Residential real estate loans $ 734,242 674,347 Commercial loans Real estate 3,503,976 2,990,141 Other commercial 1,575,514 1,342,250 Total 5,079,490 4,332,391 Consumer and other loans Home equity 452,291 434,774 Other consumer 243,410 242,951 Total 695,701 677,725 Loans receivable 6,509,433 5,684,463 Allowance for loan and lease losses (129,576 ) (129,572 ) Loans receivable, net $ 6,379,857 5,554,891 Net deferred origination (fees) costs included in loans receivable $ (2,140 ) (1,228 ) Net purchase accounting (discounts) premiums included in loans receivable $ (17,803 ) (12,144 ) Weighted-average interest rate on loans (tax-equivalent) 4.80 % 4.77 %
Summary of the activity in the ALLL	The following tables summarize the activity in the ALLL by portfolio segment: Three Months ended September 30, 2017 (Dollars in thousands) Total Residential Commercial Other Home Other Balance at beginning of period $ 129,877 11,522 68,503 36,984 7,662 5,206 Provision for loan losses 3,327 (10 ) 2,214 696 (682 ) 1,109 Charge-offs (5,983 ) (44 ) (3,227 ) (374 ) (15 ) (2,323 ) Recoveries 2,355 12 735 514 16 1,078 Balance at end of period $ 129,576 11,480 68,225 37,820 6,981 5,070 Three Months ended September 30, 2016 (Dollars in thousands) Total Residential Commercial Other Home Other Balance at beginning of period $ 132,386 13,666 66,809 37,031 8,629 6,251 Provision for loan losses 626 108 — (1,033 ) 561 990 Charge-offs (2,800 ) (11 ) (55 ) (342 ) (693 ) (1,699 ) Recoveries 2,322 148 490 923 77 684 Balance at end of period $ 132,534 13,911 67,244 36,579 8,574 6,226 Nine Months ended September 30, 2017 (Dollars in thousands) Total Residential Real Estate Commercial Real Estate Other Commercial Home Equity Other Consumer Balance at beginning of period $ 129,572 12,436 65,773 37,823 7,572 5,968 Provision for loan losses 7,938 (946 ) 6,403 551 (324 ) 2,254 Charge-offs (14,801 ) (87 ) (5,261 ) (1,855 ) (458 ) (7,140 ) Recoveries 6,867 77 1,310 1,301 191 3,988 Balance at end of period $ 129,576 11,480 68,225 37,820 6,981 5,070 Nine Months ended September 30, 2016 (Dollars in thousands) Total Residential Real Estate Commercial Real Estate Other Commercial Home Equity Other Consumer Balance at beginning of period $ 129,697 14,427 67,877 32,525 8,998 5,870 Provision for loan losses 1,194 (342 ) (3,490 ) 3,407 215 1,404 Charge-offs (5,332 ) (366 ) (342 ) (1,068 ) (891 ) (2,665 ) Recoveries 6,975 192 3,199 1,715 252 1,617 Balance at end of period $ 132,534 13,911 67,244 36,579 8,574 6,226
Summary of ALLL and loans receivable	The following tables disclose the balance in the ALLL and the recorded investment in loans by portfolio segment: September 30, 2017 (Dollars in thousands) Total Residential Real Estate Commercial Real Estate Other Commercial Home Equity Other Consumer Allowance for loan and lease losses Individually evaluated for impairment $ 4,077 320 666 2,407 94 590 Collectively evaluated for impairment 125,499 11,160 67,559 35,413 6,887 4,480 Total allowance for loan and lease losses $ 129,576 11,480 68,225 37,820 6,981 5,070 Loans receivable Individually evaluated for impairment $ 122,893 13,410 79,070 22,456 4,600 3,357 Collectively evaluated for impairment 6,386,540 720,832 3,424,906 1,553,058 447,691 240,053 Total loans receivable $ 6,509,433 734,242 3,503,976 1,575,514 452,291 243,410 December 31, 2016 (Dollars in thousands) Total Residential Real Estate Commercial Real Estate Other Commercial Home Equity Other Consumer Allowance for loan and lease losses Individually evaluated for impairment $ 6,881 856 922 4,419 296 388 Collectively evaluated for impairment 122,691 11,580 64,851 33,404 7,276 5,580 Total allowance for loan and lease losses $ 129,572 12,436 65,773 37,823 7,572 5,968 Loans receivable Individually evaluated for impairment $ 130,263 11,612 85,634 23,950 5,934 3,133 Collectively evaluated for impairment 5,554,200 662,735 2,904,507 1,318,300 428,840 239,818 Total loans receivable $ 5,684,463 674,347 2,990,141 1,342,250 434,774 242,951
Summary of impaired loans	The following tables disclose information related to impaired loans by portfolio segment: At or for the Three or Nine Months ended September 30, 2017 (Dollars in thousands) Total Residential Real Estate Commercial Real Estate Other Commercial Home Equity Other Consumer Loans with a specific valuation allowance Recorded balance $ 17,940 3,121 5,275 7,832 336 1,376 Unpaid principal balance 18,432 3,272 5,364 8,038 353 1,405 Specific valuation allowance 4,077 320 666 2,407 94 590 Average balance - three months 17,616 3,005 5,151 7,667 363 1,430 Average balance - nine months 19,310 2,916 6,177 8,550 402 1,265 Loans without a specific valuation allowance Recorded balance $ 104,953 10,289 73,795 14,624 4,264 1,981 Unpaid principal balance 129,250 11,151 94,342 16,898 4,799 2,060 Average balance - three months 107,038 10,369 76,233 14,332 4,300 1,804 Average balance - nine months 109,355 9,937 77,286 15,199 5,026 1,907 Total Recorded balance $ 122,893 13,410 79,070 22,456 4,600 3,357 Unpaid principal balance 147,682 14,423 99,706 24,936 5,152 3,465 Specific valuation allowance 4,077 320 666 2,407 94 590 Average balance - three months 124,654 13,374 81,384 21,999 4,663 3,234 Average balance - nine months 128,665 12,853 83,463 23,749 5,428 3,172 At or for the Year ended December 31, 2016 (Dollars in thousands) Total Residential Real Estate Commercial Real Estate Other Commercial Home Equity Other Consumer Loans with a specific valuation allowance Recorded balance $ 22,128 2,759 9,129 8,814 334 1,092 Unpaid principal balance 22,374 2,825 9,130 8,929 345 1,145 Specific valuation allowance 6,881 856 922 4,419 296 388 Average balance 26,745 4,942 10,441 9,840 257 1,265 Loans without a specific valuation allowance Recorded balance $ 108,135 8,853 76,505 15,136 5,600 2,041 Unpaid principal balance 131,059 9,925 94,180 17,724 7,120 2,110 Average balance 108,827 12,858 72,323 15,537 6,004 2,105 Total Recorded balance $ 130,263 11,612 85,634 23,950 5,934 3,133 Unpaid principal balance 153,433 12,750 103,310 26,653 7,465 3,255 Specific valuation allowance 6,881 856 922 4,419 296 388 Average balance 135,572 17,800 82,764 25,377 6,261 3,370
Loan portfolio aging analysis	The following tables present an aging analysis of the recorded investment in loans by portfolio segment: September 30, 2017 (Dollars in thousands) Total Residential Real Estate Commercial Real Estate Other Commercial Home Equity Other Consumer Accruing loans 30-59 days past due $ 22,567 459 12,806 5,959 1,805 1,538 Accruing loans 60-89 days past due 6,548 1,000 2,800 1,090 987 671 Accruing loans 90 days or more past due 3,944 420 — 3,261 200 63 Non-accrual loans 46,770 5,321 27,924 8,540 3,945 1,040 Total past due and non-accrual loans 79,829 7,200 43,530 18,850 6,937 3,312 Current loans receivable 6,429,604 727,042 3,460,446 1,556,664 445,354 240,098 Total loans receivable $ 6,509,433 734,242 3,503,976 1,575,514 452,291 243,410 December 31, 2016 (Dollars in thousands) Total Residential Real Estate Commercial Real Estate Other Commercial Home Equity Other Consumer Accruing loans 30-59 days past due $ 20,599 6,338 5,079 5,388 2,439 1,355 Accruing loans 60-89 days past due 5,018 1,398 754 1,352 844 670 Accruing loans 90 days or more past due 1,099 266 145 283 191 214 Non-accrual loans 49,332 4,528 30,216 8,817 5,240 531 Total past due and non-accrual loans 76,048 12,530 36,194 15,840 8,714 2,770 Current loans receivable 5,608,415 661,817 2,953,947 1,326,410 426,060 240,181 Total loans receivable $ 5,684,463 674,347 2,990,141 1,342,250 434,774 242,951
Summary of TDRs	The following tables present TDRs that occurred during the periods presented and the TDRs that occurred within the previous twelve months that subsequently defaulted during the periods presented: Three Months ended September 30, 2017 (Dollars in thousands) Total Residential Commercial Other Home Other TDRs that occurred during the period Number of loans 5 1 1 3 — — Pre-modification recorded balance $ 956 317 386 253 — — Post-modification recorded balance $ 956 317 386 253 — — TDRs that subsequently defaulted Number of loans — — — — — — Recorded balance $ — — — — — — Three Months ended September 30, 2016 (Dollars in thousands) Total Residential Commercial Other Home Other TDRs that occurred during the period Number of loans 5 — 4 1 — — Pre-modification recorded balance $ 7,781 — 7,014 767 — — Post-modification recorded balance $ 7,718 — 6,990 728 — — TDRs that subsequently defaulted Number of loans 1 — — 1 — — Recorded balance $ 5 — — 5 — — Nine Months ended September 30, 2017 (Dollars in thousands) Total Residential Real Estate Commercial Real Estate Other Commercial Home Equity Other Consumer TDRs that occurred during the period Number of loans 22 4 7 8 2 1 Pre-modification recorded balance $ 22,912 652 13,003 9,069 178 10 Post-modification recorded balance $ 20,230 652 10,321 9,069 178 10 TDRs that subsequently defaulted Number of loans 1 — — 1 — — Recorded balance $ 18 — — 18 — — Nine Months ended September 30, 2016 (Dollars in thousands) Total Residential Real Estate Commercial Real Estate Other Commercial Home Equity Other Consumer TDRs that occurred during the period Number of loans 27 — 10 15 2 — Pre-modification recorded balance $ 21,652 — 9,217 12,226 209 — Post-modification recorded balance $ 21,613 — 9,193 12,211 209 — TDRs that subsequently defaulted Number of loans 9 — 1 2 — 6 Recorded balance $ 704 — 570 5 — 129

Goodwill (Tables)

Goodwill (Tables)	9 Months Ended
	Sep. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Changes in the carrying value of goodwill	The following schedule discloses the changes in the carrying value of goodwill: Three Months ended Nine Months ended (Dollars in thousands) September 30, September 30, September 30, September 30, Net carrying value at beginning of period $ 177,811 140,638 147,053 140,638 Acquisitions and adjustments — 6,415 30,758 6,415 Net carrying value at end of period $ 177,811 147,053 177,811 147,053
Gross carrying value of goodwill and the accumulated impairment charge	The gross carrying value of goodwill and the accumulated impairment charge consists of the following: (Dollars in thousands) September 30, December 31, Gross carrying value $ 217,970 187,212 Accumulated impairment charge 1 (40,159 ) (40,159 ) Net carrying value $ 177,811 147,053 __________ 1 A goodwill impairment charge was recognized in 2011 and was due to high levels of volatility and dislocation in bank stock prices nationwide.

Variable Interest Entities (Tab

Variable Interest Entities (Tables)	9 Months Ended
	Sep. 30, 2017
Equity Method Investments and Joint Ventures [Abstract]
Carrying amounts of consolidated VIEs' assets and liabilities	The following table summarizes the carrying amounts of the consolidated VIEs’ assets and liabilities included in the Company’s statements of financial condition and are adjusted for intercompany eliminations. All assets presented can be used only to settle obligations of the consolidated VIEs and all liabilities presented consist of liabilities for which creditors and other beneficial interest holders therein have no recourse to the general credit of the Company. (Dollars in thousands) September 30, December 31, Assets Loans receivable $ 57,796 36,950 Accrued interest receivable 93 120 Other assets 3,261 1,984 Total assets $ 61,150 39,054 Liabilities Other borrowed funds $ 7,964 4,105 Accrued interest payable 15 2 Other liabilities 6 27 Total liabilities $ 7,985 4,134
Amortization expense and tax credits and other tax benefits recognized for qualified affordable housing project investments	The following table summarizes the amortization expense and the amount of tax credits and other tax benefits recognized for qualified affordable housing project investments during the periods presented. Three Months ended Nine Months ended (Dollars in thousands) September 30, September 30, September 30, September 30, Amortization expense $ 682 258 1,825 867 Tax credits and other tax benefits recognized 1,040 322 2,792 1,145

Securities Sold Under Agreeme27

Securities Sold Under Agreements to Repurchase (Tables)	9 Months Ended
	Sep. 30, 2017
Transfers and Servicing [Abstract]
Carrying Value of Repurchase Agreements	The following tables summarize the carrying value of the Company’s repurchase agreements by remaining contractual maturity and category of collateral: September 30, 2017 Remaining Contractual Maturity of the Agreements (Dollars in thousands) Overnight and Continuous Up to 30 Days Total U.S. government and federal agency $ 4,261 — 4,261 Residential mortgage-backed securities 438,872 — 438,872 Commercial mortgage-backed securities 10,463 — 10,463 Total $ 453,596 — 453,596 December 31, 2016 Remaining Contractual Maturity of the Agreements (Dollars in thousands) Overnight and Continuous Up to 30 Days Total Residential mortgage-backed securities $ 471,706 643 472,349 Commercial mortgage-backed securities 1,301 — 1,301 Total $ 473,007 643 473,650

Derivatives and Hedging Activ28

Derivatives and Hedging Activities (Tables)	9 Months Ended
	Sep. 30, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Summary of interest rate swap derivative financial instruments	As of September 30, 2017 , the Company’s interest rate swap derivative financial instruments were designated as cash flow hedges and are summarized as follows: (Dollars in thousands) Forecasted Notional Amount Variable Interest Rate 1 Fixed Interest Rate 1 Payment Term Interest rate swap $ 160,000 3 month LIBOR 3.378 % Oct. 21, 2014 - Oct. 21, 2021 Interest rate swap 100,000 3 month LIBOR 2.498 % Nov. 30, 2015 - Nov. 30, 2022 __________ 1 The Company pays the fixed interest rate and the counterparty pays the Company the variable interest rate.
Summary of Pre-Tax Gains or Losses	The following table presents the pre-tax gains or losses recorded in accumulated other comprehensive income and the Company’s statements of operations relating to the interest rate swap derivative financial instruments: Three Months ended Nine Months ended (Dollars in thousands) September 30, September 30, September 30, September 30, Interest rate swaps Amount of gain (loss) recognized in OCI (effective portion) $ 45 1,959 (1,799 ) (11,989 ) Amount of loss reclassified from OCI to interest expense (1,182 ) (1,555 ) (3,776 ) (4,962 ) Amount of loss recognized in other non-interest expense (ineffective portion) — — — —
Offsetting liabilities	The following table discloses the offsetting of financial liabilities and interest rate swap derivative liabilities. There were no interest rate swap derivative assets at the dates presented. September 30, 2017 December 31, 2016 (Dollars in thousands) Gross Amounts of Recognized Liabilities Gross Amounts Offset in the Statements of Financial Position Net Amounts of Liabilities Presented in the Statements of Financial Position Gross Amounts of Recognized Liabilities Gross Amounts Offset in the Statements of Financial Position Net Amounts of Liabilities Presented in the Statements of Financial Position Interest rate swaps $ 12,748 — 12,748 14,725 — 14,725

Other Expenses (Tables)

Other Expenses (Tables)	9 Months Ended
	Sep. 30, 2017
Other Expenses [Abstract]
Schedule of Other Expenses	Other expenses consists of the following: Three Months ended Nine Months ended (Dollars in thousands) September 30, September 30, September 30, September 30, Debit card expenses $ 1,840 2,521 5,352 6,606 Consulting and outside services 1,247 1,516 3,651 3,840 Employee expenses 1,055 948 2,969 2,434 Telephone 988 976 2,899 2,881 VIE amortization and other expenses 1,041 773 2,453 1,814 Loan expenses 653 1,062 2,266 2,800 Postage 646 626 2,007 2,296 Printing and supplies 605 733 1,913 2,397 Accounting and audit fees 499 383 1,508 1,053 Business development 641 629 1,434 1,514 ATM expenses 641 250 1,335 768 Checking and operating expenses 564 742 1,291 2,434 Mergers and acquisition expenses 245 228 1,194 1,364 Legal fees 319 177 825 730 Other 1,214 848 3,026 2,705 Total other expenses $ 12,198 12,412 34,123 35,636

Accumulated Other Comprehensi30

Accumulated Other Comprehensive Income (Loss) (Tables)	9 Months Ended
	Sep. 30, 2017
Equity [Abstract]
Activity within Accumulated Other Comprehensive Income (Loss), Net of Tax	The following table illustrates the activity within accumulated other comprehensive income (loss) by component, net of tax: (Dollars in thousands) Gains on Available-For-Sale Securities Losses on Derivatives Used for Cash Flow Hedges Total Balance at December 31, 2015 $ 13,935 (11,946 ) 1,989 Other comprehensive income (loss) before reclassifications 18,755 (7,344 ) 11,411 Amounts reclassified from accumulated other comprehensive income 399 3,039 3,438 Net current period other comprehensive income (loss) 19,154 (4,305 ) 14,849 Balance at September 30, 2016 $ 33,089 (16,251 ) 16,838 Balance at December 31, 2016 $ 1,639 (9,021 ) (7,382 ) Other comprehensive income (loss) before reclassifications 10,520 (1,102 ) 9,418 Amounts reclassified from accumulated other comprehensive income 318 2,313 2,631 Net current period other comprehensive income 10,838 1,211 12,049 Balance at September 30, 2017 $ 12,477 (7,810 ) 4,667

Earnings Per Share (Tables)

Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2017
Earnings Per Share [Abstract]
Basic and diluted earnings per share	Basic and diluted earnings per share has been computed based on the following: Three Months ended Nine Months ended (Dollars in thousands, except per share data) September 30, September 30, September 30, September 30, Net income available to common stockholders, basic and diluted $ 36,479 30,957 101,421 90,090 Average outstanding shares - basic 78,004,450 76,288,640 77,379,514 76,195,550 Add: dilutive restricted stock awards 61,492 62,233 63,430 51,501 Average outstanding shares - diluted 78,065,942 76,350,873 77,442,944 76,247,051 Basic earnings per share $ 0.47 0.40 1.31 1.18 Diluted earnings per share $ 0.47 0.40 1.31 1.18

Fair Value of Assets and Liab32

Fair Value of Assets and Liabilities (Tables)	9 Months Ended
	Sep. 30, 2017
Fair Value Disclosures [Abstract]
Fair value measurement of assets and liabilities measured at fair value on a recurring basis	The following tables disclose the fair value measurement of assets and liabilities measured at fair value on a recurring basis: Fair Value Measurements At the End of the Reporting Period Using (Dollars in thousands) Fair Value September 30, 2017 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Investment securities, available-for-sale U.S. government and federal agency $ 34,046 — 34,046 — U.S. government sponsored enterprises 19,267 — 19,267 — State and local governments 641,973 — 641,973 — Corporate bonds 249,990 — 249,990 — Residential mortgage-backed securities 838,929 — 838,929 — Commercial mortgage-backed securities 102,312 — 102,312 — Total assets measured at fair value on a recurring basis $ 1,886,517 — 1,886,517 — Interest rate swaps $ 12,748 — 12,748 — Total liabilities measured at fair value on a recurring basis $ 12,748 — 12,748 — Fair Value Measurements At the End of the Reporting Period Using (Dollars in thousands) Fair Value December 31, 2016 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Investment securities, available-for-sale U.S. government and federal agency $ 39,407 — 39,407 — U.S. government sponsored enterprises 19,570 — 19,570 — State and local governments 786,373 — 786,373 — Corporate bonds 471,951 — 471,951 — Residential mortgage-backed securities 1,007,515 — 1,007,515 — Commercial mortgage-backed securities 100,661 — 100,661 — Total assets measured at fair value on a recurring basis $ 2,425,477 — 2,425,477 — Interest rate swaps $ 14,725 — 14,725 — Total liabilities measured at fair value on a recurring basis $ 14,725 — 14,725 —
Fair value measurement of assets measured at fair value on a non-recurring basis	The following tables disclose the fair value measurement of assets with a recorded change during the period resulting from re-measuring the assets at fair value on a non-recurring basis: Fair Value Measurements At the End of the Reporting Period Using (Dollars in thousands) Fair Value September 30, 2017 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Other real estate owned $ 1,616 — — 1,616 Collateral-dependent impaired loans, net of ALLL 6,442 — — 6,442 Total assets measured at fair value on a non-recurring basis $ 8,058 — — 8,058 Fair Value Measurements At the End of the Reporting Period Using (Dollars in thousands) Fair Value December 31, 2016 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Other real estate owned $ 7,839 — — 7,839 Collateral-dependent impaired loans, net of ALLL 5,664 — — 5,664 Total assets measured at fair value on a non-recurring basis $ 13,503 — — 13,503
Quantitative information about assets measured at fair value on a non-recurring basis for which Level 3 inputs were used	The following tables present additional quantitative information about assets measured at fair value on a non-recurring basis and for which the Company has utilized Level 3 inputs to determine fair value: Fair Value September 30, 2017 Quantitative Information about Level 3 Fair Value Measurements (Dollars in thousands) Valuation Technique Unobservable Input Range (Weighted-Average) 1 Other real estate owned $ 1,616 Sales comparison approach Selling costs 8.0% - 10.0% (9.3%) Collateral-dependent impaired loans, net of ALLL $ 17 Cost approach Selling costs 20.0% - 20.0% (20.0%) 3,020 Sales comparison approach Selling costs 6.0% - 10.0% (9.2%) 3,405 Combined approach Selling costs 10.0% - 10.0% (10.0%) Adjustment to comparables 20.0% - 20.0% (20.0%) $ 6,442 Fair Value December 31, 2016 Quantitative Information about Level 3 Fair Value Measurements (Dollars in thousands) Valuation Technique Unobservable Input Range (Weighted-Average) 1 Other real estate owned $ 7,767 Sales comparison approach Selling costs 6.0% - 10.0% (6.9%) Adjustment to comparables 0.0% - 10.0% (0.1%) 72 Combined approach Selling costs 10.0% - 10.0% (10.0%) Adjustment to comparables 10.0% - 10.0% (10.0%) $ 7,839 Collateral-dependent impaired loans, net of ALLL $ 110 Cost approach Selling costs 6.0% - 20.0% (6.6%) 1,982 Sales comparison approach Selling costs 8.0% - 10.0% (9.6%) 3,572 Combined approach Selling costs 10.0% - 10.0% (10.0%) Adjustment to comparables 20.0% - 20.0% (20.0%) $ 5,664 __________ 1 The range for selling costs and adjustments to comparables indicate reductions to the fair value.
Carrying amounts and estimated fair values of financial instruments	The following tables present the carrying amounts, estimated fair values and the level within the fair value hierarchy of the Company’s financial instruments: Fair Value Measurements At the End of the Reporting Period Using (Dollars in thousands) Carrying Amount September 30, 2017 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Financial assets Cash and cash equivalents $ 220,210 220,210 — — Investment securities, available-for-sale 1,886,517 — 1,886,517 — Investment securities, held-to-maturity 655,128 — 671,198 — Loans held for sale 48,709 48,709 — — Loans receivable, net of ALLL 6,379,857 — 6,172,843 118,816 Accrued interest receivable 50,492 50,492 — — Non-marketable equity securities 21,890 — 21,890 — Total financial assets $ 9,262,803 319,411 8,752,448 118,816 Financial liabilities Deposits $ 7,767,154 6,735,130 1,035,141 — FHLB advances 153,685 — 153,814 — Repurchase agreements and other borrowed funds 461,839 — 461,839 — Subordinated debentures 126,099 — 90,845 — Accrued interest payable 3,154 3,154 — — Interest rate swaps 12,748 — 12,748 — Total financial liabilities $ 8,524,679 6,738,284 1,754,387 — Fair Value Measurements At the End of the Reporting Period Using (Dollars in thousands) Carrying Amount December 31, 2016 Quoted Prices Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Financial assets Cash and cash equivalents $ 152,541 152,541 — — Investment securities, available-for-sale 2,425,477 — 2,425,477 — Investment securities, held-to-maturity 675,674 — 689,089 — Loans held for sale 72,927 72,927 — — Loans receivable, net of ALLL 5,554,891 — 5,380,286 123,382 Accrued interest receivable 45,832 45,832 — — Non-marketable equity securities 25,550 — 25,550 — Total financial assets $ 8,952,892 271,300 8,520,402 123,382 Financial liabilities Deposits $ 7,372,279 6,090,879 1,283,532 — FHLB advances 251,749 — 257,643 — Repurchase agreements and other borrowed funds 478,090 — 478,090 — Subordinated debentures 125,991 — 85,557 — Accrued interest payable 3,584 3,584 — — Interest rate swaps 14,725 — 14,725 — Total financial liabilities $ 8,246,418 6,094,463 2,119,547 —

Mergers and Acquisitions (Table

Mergers and Acquisitions (Tables)	9 Months Ended
	Sep. 30, 2017
Business Combinations [Abstract]
Consideration transferred, identifiable net assets acquired and resulting goodwill	The following table discloses the calculation of the fair value of the consideration transferred, the total identifiable net assets acquired and the resulting goodwill arising from the Foothills acquisition: (Dollars in thousands) April 30, Fair value of consideration transferred Fair value of Company shares issued, net of equity issuance costs $ 46,673 Cash consideration for outstanding shares 17,342 Contingent consideration — Total fair value of consideration transferred 64,015 Recognized amounts of identifiable assets acquired and liabilities assumed Identifiable assets acquired Cash and cash equivalents 13,251 Investment securities 25,420 Loans receivable 292,529 Core deposit intangible 1 4,331 Accrued income and other assets 19,699 Total identifiable assets acquired 355,230 Liabilities assumed Deposits 296,760 FHLB advances 22,800 Accrued expenses and other liabilities 2,264 Total liabilities assumed 321,824 Total identifiable net assets 33,406 Goodwill recognized $ 30,609 __________ 1 The core deposit intangible for this acquisition was determined to have an estimated life of 10 years .
Unaudited Pro Forma Summary of the Company as if the Acquisitions had Occurred at the Beginning of the Period	The following unaudited pro forma summary presents consolidated information of the Company as if the Foothills acquisition had occurred on January 1, 2016: Three Months ended Nine Months ended (Dollars in thousands) September 30, September 30, September 30, September 30, Net interest income and non-interest income $ 119,997 110,969 345,068 324,277 Net income 36,479 32,217 99,231 93,005

Nature of Operations and Summ34

Nature of Operations and Summary of Significant Accounting Policies (Details Textual)	9 Months Ended
	Sep. 30, 2017USD ($)quarterstepoperating_segmentdivision$ / shares	Dec. 31, 2016USD ($)
Number of Bank Divisions | division	14
Number of Operating Segments | operating_segment	1
Total assets	$ 9,798,602,000	$ 9,450,600,000
Gross loans	$ 6,509,433,000	$ 5,684,463,000
Minimum Period Past Due to Consider Loan as Delinquent	30 days
Minimum Period Past Due to Consider Loan as Non Accrual	90 days
Number of Quarters Used to Evaluate Historical Loss Experience | quarter	12
Period to begin developing and implementing processes and procedures for FASB Update	2 years
Effect of change on net income from applying new accounting pronouncement	$ 555,000
Effect of change on diluted earnings per share from applying new accounting pronouncement | $ / shares	$ 0.01
Maximum lease term to not recognize lease assets and liabilities	12 months
Number of Steps to Achieve Core Revenue Recognition Principal | step	5
Consumer and Other
Minimum Number of Days Delinquent to Charge off Loans	120 days
Minimum Range
Number of years for home equity loan origination term	10 years
Maximum Range
Number of years for home equity loan origination term	15 years
Collegiate Peaks Bank
Total assets	$ 536,387,000
Gross loans	331,486,000
Total deposits	$ 460,380,000

Amortized Cost, Gross Unrealize

Amortized Cost, Gross Unrealized Gains and Losses and Fair Value of Investment Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Available-for-sale
Amortized Cost	$ 1,866,151	$ 2,422,802
Gross Unrealized Gains	27,959	24,960
Gross Unrealized Losses	(7,593)	(22,285)
Fair Value	1,886,517	2,425,477
Held-to-maturity
Amortized Cost	655,128	675,674
Gross Unrealized Gains	23,503	21,400
Gross Unrealized Losses	(7,433)	(7,985)
Fair Value	671,198	689,089
Total
Amortized Cost	2,521,279	3,098,476
Gross Unrealized Gains	51,462	46,360
Gross Unrealized Losses	(15,026)	(30,270)
Fair Value	2,557,715	3,114,566
U.S. government and federal agency
Available-for-sale
Amortized Cost	34,161	39,554
Gross Unrealized Gains	45	15
Gross Unrealized Losses	(160)	(162)
Fair Value	34,046	39,407
U.S. government sponsored enterprises
Available-for-sale
Amortized Cost	19,178	19,557
Gross Unrealized Gains	100	55
Gross Unrealized Losses	(11)	(42)
Fair Value	19,267	19,570
State and local governments
Available-for-sale
Amortized Cost	623,296	775,395
Gross Unrealized Gains	22,616	20,941
Gross Unrealized Losses	(3,939)	(9,963)
Fair Value	641,973	786,373
Held-to-maturity
Amortized Cost	655,128	675,674
Gross Unrealized Gains	23,503	21,400
Gross Unrealized Losses	(7,433)	(7,985)
Fair Value	671,198	689,089
Corporate bonds
Available-for-sale
Amortized Cost	248,865	471,569
Gross Unrealized Gains	1,281	1,175
Gross Unrealized Losses	(156)	(793)
Fair Value	249,990	471,951
Residential mortgage-backed securities
Available-for-sale
Amortized Cost	837,808	1,014,518
Gross Unrealized Gains	3,703	2,744
Gross Unrealized Losses	(2,582)	(9,747)
Fair Value	838,929	1,007,515
Commercial mortgage-backed securities
Available-for-sale
Amortized Cost	102,843	102,209
Gross Unrealized Gains	214	30
Gross Unrealized Losses	(745)	(1,578)
Fair Value	$ 102,312	$ 100,661

Investment Securities Maturity

Investment Securities Maturity Schedule (Details) - USD ($) $ in Thousands		Sep. 30, 2017	Dec. 31, 2016
Available-for-Sale, Amortized Cost
Due within one year		$ 83,120
Due after one year through five years		248,611
Due after five years through ten years		225,885
Due after ten years		367,884
Total before mortgage-backed securities		925,500
Total		1,866,151	$ 2,422,802
Available-for-Sale, Fair Value
Due within one year		83,270
Due after one year through five years		250,105
Due after five years through ten years		235,110
Due after ten years		376,791
Total before mortgage-backed securities		945,276
Total		1,886,517	2,425,477
Held-to-Maturity, Amortized Cost
Due within one year		0
Due after one year through five years		1,697
Due after five years through ten years		72,217
Due after ten years		581,214
Total before mortgage-backed securities		655,128
Amortized Cost		655,128	675,674
Held-to-Maturity, Fair Value
Due within one year		0
Due after one year through five years		1,756
Due after five years through ten years		74,597
Due after ten years		594,845
Total before mortgage-backed securities		671,198
Total		671,198	$ 689,089
Mortgage-backed securities
Available-for-Sale, Amortized Cost
Mortgage-backed securities	[1]	940,651
Available-for-Sale, Fair Value
Mortgage-backed securities	[1]	941,241
Held-to-Maturity, Amortized Cost
Mortgage-backed securities	[1]	0
Held-to-Maturity, Fair Value
Mortgage-backed securities	[1]	$ 0
[1]	Mortgage-backed securities, which have prepayment provisions, are not assigned to maturity categories due to fluctuations in their prepayment speeds.

Proceeds From Sales and Calls o

Proceeds From Sales and Calls of Investment Securities and Associates Gains or Losses (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Available-for-sale
Proceeds from sales and calls of investment securities		$ 155,894	$ 59,974	$ 268,557	$ 148,458
Gross realized gains	[1]	278	366	3,345	1,309
Gross realized losses	[1]	(201)	(960)	(3,864)	(1,960)
Held-to-maturity
Proceeds from calls of investment securities		3,675	340	18,910	21,965
Gross realized gains	[1]	0	0	153	91
Gross realized losses	[1]	$ 0	$ 0	$ (179)	$ (146)
[1]	The gain or loss on the sale or call of each investment security is determined by the specific identification method.

Investment with an Unrealized L

Investment with an Unrealized Loss Position (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Available-for-sale, Fair Value
Less than 12 Months	$ 539,859	$ 1,188,397
12 Months or More	147,626	144,120
Total	687,485	1,332,517
Available-for-sale, Unrealized Loss
Less than 12 Months	(3,920)	(16,446)
12 Months or More	(3,673)	(5,839)
Total	(7,593)	(22,285)
Held-to-maturity, Fair Value
Less than 12 Months	10,683	117,912
12 Months or More	104,858	86,601
Total	115,541	204,513
Held-to-maturity, Unrealized Loss
Less than 12 Months	(139)	(1,712)
12 Months or More	(7,294)	(6,273)
Total	(7,433)	(7,985)
U.S. government and federal agency
Available-for-sale, Fair Value
Less than 12 Months	1,952	6,718
12 Months or More	13,548	26,239
Total	15,500	32,957
Available-for-sale, Unrealized Loss
Less than 12 Months	(18)	(24)
12 Months or More	(142)	(138)
Total	(160)	(162)
U.S. government sponsored enterprises
Available-for-sale, Fair Value
Less than 12 Months	3,460	6,049
12 Months or More	0	0
Total	3,460	6,049
Available-for-sale, Unrealized Loss
Less than 12 Months	(11)	(42)
12 Months or More	0	0
Total	(11)	(42)
State and local governments
Available-for-sale, Fair Value
Less than 12 Months	76,806	222,700
12 Months or More	83,941	81,783
Total	160,747	304,483
Available-for-sale, Unrealized Loss
Less than 12 Months	(932)	(4,949)
12 Months or More	(3,007)	(5,014)
Total	(3,939)	(9,963)
Held-to-maturity, Fair Value
Less than 12 Months	10,683	117,912
12 Months or More	104,858	86,601
Total	115,541	204,513
Held-to-maturity, Unrealized Loss
Less than 12 Months	(139)	(1,712)
12 Months or More	(7,294)	(6,273)
Total	(7,433)	(7,985)
Corporate bonds
Available-for-sale, Fair Value
Less than 12 Months	48,048	174,821
12 Months or More	3,270	6,141
Total	51,318	180,962
Available-for-sale, Unrealized Loss
Less than 12 Months	(150)	(774)
12 Months or More	(6)	(19)
Total	(156)	(793)
Residential mortgage-backed securities
Available-for-sale, Fair Value
Less than 12 Months	350,965	688,811
12 Months or More	38,751	29,957
Total	389,716	718,768
Available-for-sale, Unrealized Loss
Less than 12 Months	(2,102)	(9,079)
12 Months or More	(480)	(668)
Total	(2,582)	(9,747)
Commercial mortgage-backed securities
Available-for-sale, Fair Value
Less than 12 Months	58,628	89,298
12 Months or More	8,116	0
Total	66,744	89,298
Available-for-sale, Unrealized Loss
Less than 12 Months	(707)	(1,578)
12 Months or More	(38)	0
Total	$ (745)	$ (1,578)

Investment Securities (Details

Investment Securities (Details Textual) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]
Other-than-temporary impairment on investment securities	$ 0	$ 0

Loans Receivable, Net Summary o

Loans Receivable, Net Summary of Loans Receivable (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Summary of Loans Receivable
Loans receivable	$ 6,509,433	$ 5,684,463
Allowance for loan and lease losses	(129,576)	(129,572)
Loans receivable, net	6,379,857	5,554,891
Net deferred origination (fees) costs included in loans receivable	(2,140)	(1,228)
Net purchase accounting (discounts) premiums included in loans receivable	$ (17,803)	$ (12,144)
Weighted-average interest rate on loans (tax-equivalent)	4.80%	4.77%
Residential Real Estate | Residential Real Estate
Summary of Loans Receivable
Loans receivable	$ 734,242	$ 674,347
Allowance for loan and lease losses	(11,480)	(12,436)
Commercial
Summary of Loans Receivable
Loans receivable	5,079,490	4,332,391
Commercial | Commercial Real Estate
Summary of Loans Receivable
Loans receivable	3,503,976	2,990,141
Allowance for loan and lease losses	(68,225)	(65,773)
Commercial | Other Commercial
Summary of Loans Receivable
Loans receivable	1,575,514	1,342,250
Allowance for loan and lease losses	(37,820)	(37,823)
Consumer and Other
Summary of Loans Receivable
Loans receivable	695,701	677,725
Consumer and Other | Home Equity
Summary of Loans Receivable
Loans receivable	452,291	434,774
Allowance for loan and lease losses	(6,981)	(7,572)
Consumer and Other | Other Consumer
Summary of Loans Receivable
Loans receivable	243,410	242,951
Allowance for loan and lease losses	$ (5,070)	$ (5,968)

ALLL Activity (Details)

ALLL Activity (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Allowance for loan and lease losses
Balance at beginning of period	$ 129,877	$ 132,386	$ 129,572	$ 129,697
Provision for loan losses	3,327	626	7,938	1,194
Charge-offs	(5,983)	(2,800)	(14,801)	(5,332)
Recoveries	2,355	2,322	6,867	6,975
Balance at end of period	129,576	132,534	129,576	132,534
Residential Real Estate | Residential Real Estate
Allowance for loan and lease losses
Balance at beginning of period	11,522	13,666	12,436	14,427
Provision for loan losses	(10)	108	(946)	(342)
Charge-offs	(44)	(11)	(87)	(366)
Recoveries	12	148	77	192
Balance at end of period	11,480	13,911	11,480	13,911
Commercial | Commercial Real Estate
Allowance for loan and lease losses
Balance at beginning of period	68,503	66,809	65,773	67,877
Provision for loan losses	2,214	0	6,403	(3,490)
Charge-offs	(3,227)	(55)	(5,261)	(342)
Recoveries	735	490	1,310	3,199
Balance at end of period	68,225	67,244	68,225	67,244
Commercial | Other Commercial
Allowance for loan and lease losses
Balance at beginning of period	36,984	37,031	37,823	32,525
Provision for loan losses	696	(1,033)	551	3,407
Charge-offs	(374)	(342)	(1,855)	(1,068)
Recoveries	514	923	1,301	1,715
Balance at end of period	37,820	36,579	37,820	36,579
Consumer and Other | Home Equity
Allowance for loan and lease losses
Balance at beginning of period	7,662	8,629	7,572	8,998
Provision for loan losses	(682)	561	(324)	215
Charge-offs	(15)	(693)	(458)	(891)
Recoveries	16	77	191	252
Balance at end of period	6,981	8,574	6,981	8,574
Consumer and Other | Other Consumer
Allowance for loan and lease losses
Balance at beginning of period	5,206	6,251	5,968	5,870
Provision for loan losses	1,109	990	2,254	1,404
Charge-offs	(2,323)	(1,699)	(7,140)	(2,665)
Recoveries	1,078	684	3,988	1,617
Balance at end of period	$ 5,070	$ 6,226	$ 5,070	$ 6,226

ALLL and Loans Receivable Summa

ALLL and Loans Receivable Summary (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Allowance for Loan and Lease Losses and Loans Receivable
Individually evaluated for impairment	$ 4,077	$ 6,881
Collectively evaluated for impairment	125,499	122,691
Total allowance for loan and lease losses	129,576	129,572
Individually evaluated for impairment	122,893	130,263
Collectively evaluated for impairment	6,386,540	5,554,200
Total loans receivable	6,509,433	5,684,463
Residential Real Estate | Residential Real Estate
Allowance for Loan and Lease Losses and Loans Receivable
Individually evaluated for impairment	320	856
Collectively evaluated for impairment	11,160	11,580
Total allowance for loan and lease losses	11,480	12,436
Individually evaluated for impairment	13,410	11,612
Collectively evaluated for impairment	720,832	662,735
Total loans receivable	734,242	674,347
Commercial
Allowance for Loan and Lease Losses and Loans Receivable
Total loans receivable	5,079,490	4,332,391
Commercial | Commercial Real Estate
Allowance for Loan and Lease Losses and Loans Receivable
Individually evaluated for impairment	666	922
Collectively evaluated for impairment	67,559	64,851
Total allowance for loan and lease losses	68,225	65,773
Individually evaluated for impairment	79,070	85,634
Collectively evaluated for impairment	3,424,906	2,904,507
Total loans receivable	3,503,976	2,990,141
Commercial | Other Commercial
Allowance for Loan and Lease Losses and Loans Receivable
Individually evaluated for impairment	2,407	4,419
Collectively evaluated for impairment	35,413	33,404
Total allowance for loan and lease losses	37,820	37,823
Individually evaluated for impairment	22,456	23,950
Collectively evaluated for impairment	1,553,058	1,318,300
Total loans receivable	1,575,514	1,342,250
Consumer and Other
Allowance for Loan and Lease Losses and Loans Receivable
Total loans receivable	695,701	677,725
Consumer and Other | Home Equity
Allowance for Loan and Lease Losses and Loans Receivable
Individually evaluated for impairment	94	296
Collectively evaluated for impairment	6,887	7,276
Total allowance for loan and lease losses	6,981	7,572
Individually evaluated for impairment	4,600	5,934
Collectively evaluated for impairment	447,691	428,840
Total loans receivable	452,291	434,774
Consumer and Other | Other Consumer
Allowance for Loan and Lease Losses and Loans Receivable
Individually evaluated for impairment	590	388
Collectively evaluated for impairment	4,480	5,580
Total allowance for loan and lease losses	5,070	5,968
Individually evaluated for impairment	3,357	3,133
Collectively evaluated for impairment	240,053	239,818
Total loans receivable	$ 243,410	$ 242,951

Impaired Loans (Details)

Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2017	Dec. 31, 2016
Summary of the impaired loans by portfolio class of loans
Loans with a specific valuation allowance, Recorded balance	$ 17,940	$ 17,940	$ 22,128
Loans with a specific valuation allowance, Unpaid principal balance	18,432	18,432	22,374
Specific valuation allowance	4,077	4,077	6,881
Loans with a specific valuation allowance, Average balance	17,616	19,310	26,745
Loans without a specific valuation allowance, Recorded balance	104,953	104,953	108,135
Loans without a specific valuation allowance, Unpaid principal balance	129,250	129,250	131,059
Loans without a specific valuation allowance, Average balance	107,038	109,355	108,827
Recorded balance	122,893	122,893	130,263
Unpaid principal balance	147,682	147,682	153,433
Average balance	124,654	128,665	135,572
Residential Real Estate | Residential Real Estate
Summary of the impaired loans by portfolio class of loans
Loans with a specific valuation allowance, Recorded balance	3,121	3,121	2,759
Loans with a specific valuation allowance, Unpaid principal balance	3,272	3,272	2,825
Specific valuation allowance	320	320	856
Loans with a specific valuation allowance, Average balance	3,005	2,916	4,942
Loans without a specific valuation allowance, Recorded balance	10,289	10,289	8,853
Loans without a specific valuation allowance, Unpaid principal balance	11,151	11,151	9,925
Loans without a specific valuation allowance, Average balance	10,369	9,937	12,858
Recorded balance	13,410	13,410	11,612
Unpaid principal balance	14,423	14,423	12,750
Average balance	13,374	12,853	17,800
Commercial | Commercial Real Estate
Summary of the impaired loans by portfolio class of loans
Loans with a specific valuation allowance, Recorded balance	5,275	5,275	9,129
Loans with a specific valuation allowance, Unpaid principal balance	5,364	5,364	9,130
Specific valuation allowance	666	666	922
Loans with a specific valuation allowance, Average balance	5,151	6,177	10,441
Loans without a specific valuation allowance, Recorded balance	73,795	73,795	76,505
Loans without a specific valuation allowance, Unpaid principal balance	94,342	94,342	94,180
Loans without a specific valuation allowance, Average balance	76,233	77,286	72,323
Recorded balance	79,070	79,070	85,634
Unpaid principal balance	99,706	99,706	103,310
Average balance	81,384	83,463	82,764
Commercial | Other Commercial
Summary of the impaired loans by portfolio class of loans
Loans with a specific valuation allowance, Recorded balance	7,832	7,832	8,814
Loans with a specific valuation allowance, Unpaid principal balance	8,038	8,038	8,929
Specific valuation allowance	2,407	2,407	4,419
Loans with a specific valuation allowance, Average balance	7,667	8,550	9,840
Loans without a specific valuation allowance, Recorded balance	14,624	14,624	15,136
Loans without a specific valuation allowance, Unpaid principal balance	16,898	16,898	17,724
Loans without a specific valuation allowance, Average balance	14,332	15,199	15,537
Recorded balance	22,456	22,456	23,950
Unpaid principal balance	24,936	24,936	26,653
Average balance	21,999	23,749	25,377
Consumer and Other | Home Equity
Summary of the impaired loans by portfolio class of loans
Loans with a specific valuation allowance, Recorded balance	336	336	334
Loans with a specific valuation allowance, Unpaid principal balance	353	353	345
Specific valuation allowance	94	94	296
Loans with a specific valuation allowance, Average balance	363	402	257
Loans without a specific valuation allowance, Recorded balance	4,264	4,264	5,600
Loans without a specific valuation allowance, Unpaid principal balance	4,799	4,799	7,120
Loans without a specific valuation allowance, Average balance	4,300	5,026	6,004
Recorded balance	4,600	4,600	5,934
Unpaid principal balance	5,152	5,152	7,465
Average balance	4,663	5,428	6,261
Consumer and Other | Other Consumer
Summary of the impaired loans by portfolio class of loans
Loans with a specific valuation allowance, Recorded balance	1,376	1,376	1,092
Loans with a specific valuation allowance, Unpaid principal balance	1,405	1,405	1,145
Specific valuation allowance	590	590	388
Loans with a specific valuation allowance, Average balance	1,430	1,265	1,265
Loans without a specific valuation allowance, Recorded balance	1,981	1,981	2,041
Loans without a specific valuation allowance, Unpaid principal balance	2,060	2,060	2,110
Loans without a specific valuation allowance, Average balance	1,804	1,907	2,105
Recorded balance	3,357	3,357	3,133
Unpaid principal balance	3,465	3,465	3,255
Average balance	$ 3,234	$ 3,172	$ 3,370

Loans Receivable Aging Analysis

Loans Receivable Aging Analysis (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Loan portfolio aging analysis
Non-accrual loans	$ 46,770	$ 49,332
Total past due and non-accrual loans	79,829	76,048
Current loans receivable	6,429,604	5,608,415
Total loans receivable	6,509,433	5,684,463
Accruing loans 30 to 59 days past due
Loan portfolio aging analysis
Past due loans	22,567	20,599
Accruing loans 60 to 89 days past due
Loan portfolio aging analysis
Past due loans	6,548	5,018
Accruing loans 90 days or more past due
Loan portfolio aging analysis
Past due loans	3,944	1,099
Residential Real Estate | Residential Real Estate
Loan portfolio aging analysis
Non-accrual loans	5,321	4,528
Total past due and non-accrual loans	7,200	12,530
Current loans receivable	727,042	661,817
Total loans receivable	734,242	674,347
Residential Real Estate | Residential Real Estate | Accruing loans 30 to 59 days past due
Loan portfolio aging analysis
Past due loans	459	6,338
Residential Real Estate | Residential Real Estate | Accruing loans 60 to 89 days past due
Loan portfolio aging analysis
Past due loans	1,000	1,398
Residential Real Estate | Residential Real Estate | Accruing loans 90 days or more past due
Loan portfolio aging analysis
Past due loans	420	266
Commercial
Loan portfolio aging analysis
Total loans receivable	5,079,490	4,332,391
Commercial | Commercial Real Estate
Loan portfolio aging analysis
Non-accrual loans	27,924	30,216
Total past due and non-accrual loans	43,530	36,194
Current loans receivable	3,460,446	2,953,947
Total loans receivable	3,503,976	2,990,141
Commercial | Commercial Real Estate | Accruing loans 30 to 59 days past due
Loan portfolio aging analysis
Past due loans	12,806	5,079
Commercial | Commercial Real Estate | Accruing loans 60 to 89 days past due
Loan portfolio aging analysis
Past due loans	2,800	754
Commercial | Commercial Real Estate | Accruing loans 90 days or more past due
Loan portfolio aging analysis
Past due loans	0	145
Commercial | Other Commercial
Loan portfolio aging analysis
Non-accrual loans	8,540	8,817
Total past due and non-accrual loans	18,850	15,840
Current loans receivable	1,556,664	1,326,410
Total loans receivable	1,575,514	1,342,250
Commercial | Other Commercial | Accruing loans 30 to 59 days past due
Loan portfolio aging analysis
Past due loans	5,959	5,388
Commercial | Other Commercial | Accruing loans 60 to 89 days past due
Loan portfolio aging analysis
Past due loans	1,090	1,352
Commercial | Other Commercial | Accruing loans 90 days or more past due
Loan portfolio aging analysis
Past due loans	3,261	283
Consumer and Other
Loan portfolio aging analysis
Total loans receivable	695,701	677,725
Consumer and Other | Home Equity
Loan portfolio aging analysis
Non-accrual loans	3,945	5,240
Total past due and non-accrual loans	6,937	8,714
Current loans receivable	445,354	426,060
Total loans receivable	452,291	434,774
Consumer and Other | Home Equity | Accruing loans 30 to 59 days past due
Loan portfolio aging analysis
Past due loans	1,805	2,439
Consumer and Other | Home Equity | Accruing loans 60 to 89 days past due
Loan portfolio aging analysis
Past due loans	987	844
Consumer and Other | Home Equity | Accruing loans 90 days or more past due
Loan portfolio aging analysis
Past due loans	200	191
Consumer and Other | Other Consumer
Loan portfolio aging analysis
Non-accrual loans	1,040	531
Total past due and non-accrual loans	3,312	2,770
Current loans receivable	240,098	240,181
Total loans receivable	243,410	242,951
Consumer and Other | Other Consumer | Accruing loans 30 to 59 days past due
Loan portfolio aging analysis
Past due loans	1,538	1,355
Consumer and Other | Other Consumer | Accruing loans 60 to 89 days past due
Loan portfolio aging analysis
Past due loans	671	670
Consumer and Other | Other Consumer | Accruing loans 90 days or more past due
Loan portfolio aging analysis
Past due loans	$ 63	$ 214

Troubled Debt Restructurings (D

Troubled Debt Restructurings (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017USD ($)Loan	Sep. 30, 2016USD ($)Loan	Sep. 30, 2017USD ($)Loan	Sep. 30, 2016USD ($)Loan
Troubled Debt Restructurings
TDRs that Occurred During the Period, Number of Loans | Loan	5	5	22	27
TDRs that Occurred During the Period, Pre-modification recorded balance	$ 956	$ 7,781	$ 22,912	$ 21,652
TDRs that Occurred During the Period, Post-modification recorded balance	$ 956	$ 7,718	$ 20,230	$ 21,613
TDRs that Subsequently Defaulted, Number of Loans | Loan	0	1	1	9
TDRs that Subsequently Defaulted, Recorded Balance	$ 0	$ 5	$ 18	$ 704
Residential Real Estate | Residential Real Estate
Troubled Debt Restructurings
TDRs that Occurred During the Period, Number of Loans | Loan	1	0	4	0
TDRs that Occurred During the Period, Pre-modification recorded balance	$ 317	$ 0	$ 652	$ 0
TDRs that Occurred During the Period, Post-modification recorded balance	$ 317	$ 0	$ 652	$ 0
TDRs that Subsequently Defaulted, Number of Loans | Loan	0	0	0	0
TDRs that Subsequently Defaulted, Recorded Balance	$ 0	$ 0	$ 0	$ 0
Commercial | Commercial Real Estate
Troubled Debt Restructurings
TDRs that Occurred During the Period, Number of Loans | Loan	1	4	7	10
TDRs that Occurred During the Period, Pre-modification recorded balance	$ 386	$ 7,014	$ 13,003	$ 9,217
TDRs that Occurred During the Period, Post-modification recorded balance	$ 386	$ 6,990	$ 10,321	$ 9,193
TDRs that Subsequently Defaulted, Number of Loans | Loan	0	0	0	1
TDRs that Subsequently Defaulted, Recorded Balance	$ 0	$ 0	$ 0	$ 570
Commercial | Other Commercial
Troubled Debt Restructurings
TDRs that Occurred During the Period, Number of Loans | Loan	3	1	8	15
TDRs that Occurred During the Period, Pre-modification recorded balance	$ 253	$ 767	$ 9,069	$ 12,226
TDRs that Occurred During the Period, Post-modification recorded balance	$ 253	$ 728	$ 9,069	$ 12,211
TDRs that Subsequently Defaulted, Number of Loans | Loan	0	1	1	2
TDRs that Subsequently Defaulted, Recorded Balance	$ 0	$ 5	$ 18	$ 5
Consumer and Other | Home Equity
Troubled Debt Restructurings
TDRs that Occurred During the Period, Number of Loans | Loan	0	0	2	2
TDRs that Occurred During the Period, Pre-modification recorded balance	$ 0	$ 0	$ 178	$ 209
TDRs that Occurred During the Period, Post-modification recorded balance	$ 0	$ 0	$ 178	$ 209
TDRs that Subsequently Defaulted, Number of Loans | Loan	0	0	0	0
TDRs that Subsequently Defaulted, Recorded Balance	$ 0	$ 0	$ 0	$ 0
Consumer and Other | Other Consumer
Troubled Debt Restructurings
TDRs that Occurred During the Period, Number of Loans | Loan	0	0	1	0
TDRs that Occurred During the Period, Pre-modification recorded balance	$ 0	$ 0	$ 10	$ 0
TDRs that Occurred During the Period, Post-modification recorded balance	$ 0	$ 0	$ 10	$ 0
TDRs that Subsequently Defaulted, Number of Loans | Loan	0	0	0	6
TDRs that Subsequently Defaulted, Recorded Balance	$ 0	$ 0	$ 0	$ 129

Loans Receivable, Net (Details

Loans Receivable, Net (Details Textual)	9 Months Ended
	Sep. 30, 2017USD ($)portfolio_segment	Dec. 31, 2016USD ($)	Sep. 30, 2016USD ($)
Loans and Leases Receivable Disclosure
Number of segments in the Company's loan portfolio | portfolio_segment	3
TDR With Pre Modification Loan Balance for Which Oreo Was Received	$ 5,152,000		$ 4,967,000
Consumer mortgage loans secured by residential real estate properties for which formal foreclosure proceedings are in process	2,559,000	$ 1,770,000
OREO Secured by Residential Real Estate	$ 986,000	$ 2,699,000

Goodwill Changes in the Carryin

Goodwill Changes in the Carrying Value of Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Goodwill Roll Forward
Net carrying value at beginning of period	$ 177,811	$ 140,638	$ 147,053	$ 140,638
Acquisitions and adjustments	0	6,415	30,758	6,415
Net carrying value at end of period	$ 177,811	$ 147,053	$ 177,811	$ 147,053

Net Carrying Value of Goodwill

Net Carrying Value of Goodwill (Details) - USD ($) $ in Thousands		Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Dec. 31, 2015
Gross carrying value of goodwill and the accumulated impairment charge
Gross carrying value		$ 217,970		$ 187,212
Accumulated impairment charge	[1]	(40,159)		(40,159)
Net carrying value		$ 177,811	$ 177,811	$ 147,053	$ 147,053	$ 140,638	$ 140,638
[1]	A goodwill impairment charge was recognized in 2011 and was due to high levels of volatility and dislocation in bank stock prices nationwide.

Variable Interest Entities VIE

Variable Interest Entities VIE Carrying Amounts Included in Financial Statements (Details) - Consolidated VIEs - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Consolidated VIEs
Assets	$ 61,150	$ 39,054
Liabilities	7,985	4,134
Loans Receivable
Consolidated VIEs
Assets	57,796	36,950
Accrued Interest Receivable
Consolidated VIEs
Assets	93	120
Other assets
Consolidated VIEs
Assets	3,261	1,984
Other borrowed funds
Consolidated VIEs
Liabilities	7,964	4,105
Accrued interest payable
Consolidated VIEs
Liabilities	15	2
Other liabilities
Consolidated VIEs
Liabilities	$ 6	$ 27

Variable Interest Entities Amor

Variable Interest Entities Amortization Expense and Tax Credits and Other Tax Benefits (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Investments in Qualified Affordable Housing Projects
Amortization expense	$ 682	$ 258	$ 1,825	$ 867
Tax credits and other tax benefits recognized	$ 1,040	$ 322	$ 2,792	$ 1,145

Variable Interest Entities (Det

Variable Interest Entities (Details Textual) - USD ($)	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Variable Interest Entities
Unfunded contingent commitments	$ 23,283,000
Unfunded contingent commitments expected to be fulfilled in 2017	14,947,000
Unfunded contingent commitments expected to be fulfilled in 2018	8,336,000
Impairment losses	0
Other assets
Variable Interest Entities
Carrying value of equity investments in LIHTCs	$ 8,127,000	$ 7,282,000
CDE
Variable Interest Entities
Tax credit period	7 years
LIHTC
Variable Interest Entities
Tax credit period	10 years
Tax credit compliance period	15 years

Carrying Value of Repurchase Ag

Carrying Value of Repurchase Agreements (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Securities Sold Under Agreements to Repurchase
Repurchase Agreements	$ 453,596	$ 473,650
Overnight and Continuous
Securities Sold Under Agreements to Repurchase
Repurchase Agreements	453,596	473,007
Up to 30 Days
Securities Sold Under Agreements to Repurchase
Repurchase Agreements	0	643
U.S. government and federal agency
Securities Sold Under Agreements to Repurchase
Repurchase Agreements	4,261
U.S. government and federal agency | Overnight and Continuous
Securities Sold Under Agreements to Repurchase
Repurchase Agreements	4,261
U.S. government and federal agency | Up to 30 Days
Securities Sold Under Agreements to Repurchase
Repurchase Agreements	0
Residential mortgage-backed securities
Securities Sold Under Agreements to Repurchase
Repurchase Agreements	438,872	472,349
Residential mortgage-backed securities | Overnight and Continuous
Securities Sold Under Agreements to Repurchase
Repurchase Agreements	438,872	471,706
Residential mortgage-backed securities | Up to 30 Days
Securities Sold Under Agreements to Repurchase
Repurchase Agreements	0	643
Commercial mortgage-backed securities
Securities Sold Under Agreements to Repurchase
Repurchase Agreements	10,463	1,301
Commercial mortgage-backed securities | Overnight and Continuous
Securities Sold Under Agreements to Repurchase
Repurchase Agreements	10,463	1,301
Commercial mortgage-backed securities | Up to 30 Days
Securities Sold Under Agreements to Repurchase
Repurchase Agreements	$ 0	$ 0

Securities Sold Under Agreeme53

Securities Sold Under Agreements to Repurchase Securities Sold Under Agreements to Repurchase (Details Textual) - USD ($)	Sep. 30, 2017	Dec. 31, 2016
Securities Sold Under Agreements to Repurchase
Repurchase Agreements	$ 453,596,000	$ 473,650,000
Securities Pledged for Repurchase Agreements	$ 528,791,000	$ 472,239,000

Interest Rate Swap Summary (Det

Interest Rate Swap Summary (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2017USD ($)
Interest Rate Swap One
Interest rate swap derivative financial instruments
Forecasted Notional Amount	$ 160,000
Variable Interest Rate	3 month LIBOR	[1]
Fixed Interest Rate	3.378%	[1]
Payment Term, Effective Date	Oct. 21, 2014
Payment Term, Maturity Date	Oct. 21, 2021
Interest Rate Swap Two
Interest rate swap derivative financial instruments
Forecasted Notional Amount	$ 100,000
Variable Interest Rate	3 month LIBOR	[1]
Fixed Interest Rate	2.498%	[1]
Payment Term, Effective Date	Nov. 30, 2015
Payment Term, Maturity Date	Nov. 30, 2022
[1]	The Company pays the fixed interest rate and the counterparty pays the Company the variable interest rate.

Derivatives and Hedging Activ55

Derivatives and Hedging Activities Interest Rate Swap Gains or Losses (Details) - Interest Rate Swap - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Interest Expense
Pre-Tax Gains or Losses
Amount of loss reclassified from OCI to interest expense	$ (1,182)	$ (1,555)	$ (3,776)	$ (4,962)
Other Non-Interest Expense
Pre-Tax Gains or Losses
Amount of loss recognized in other non-interest expense (ineffective portion)	0	0	0	0
Other Comprehensive Income
Pre-Tax Gains or Losses
Amount of gain (loss) recognized in OCI (effective portion)	$ 45	$ 1,959	$ (1,799)	$ (11,989)

Derivatives and Hedging Activ56

Derivatives and Hedging Activities Offsetting Assets (Details) - Interest Rate Swap - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Offsetting Derivative Assets
Gross Amounts of Recognized Assets	$ 0	$ 0
Gross Amounts Offset in the Statements of Financial Position	0	0
Net Amounts of Assets Presented in the Statements of Financial Position	$ 0	$ 0

Derivatives and Hedging Activ57

Derivatives and Hedging Activities Offsetting Liabilities (Details) - Interest Rate Swap - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Offsetting Derivative Liabilities
Gross Amounts of Recognized Liabilities	$ 12,748	$ 14,725
Gross Amounts Offset in the Statements of Financial Position	0	0
Net Amounts of Liabilities Presented in the Statements of Financial Position	$ 12,748	$ 14,725

Derivatives and Hedging Activ58

Derivatives and Hedging Activities (Details Textual) - USD ($)	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Interest Rate Swap One
Interest rate swap derivative financial instruments
Forecasted Notional Amount	$ 160,000,000
Interest Rate Swap Two
Interest rate swap derivative financial instruments
Forecasted Notional Amount	100,000,000
Interest Rate Swap
Interest rate swap derivative financial instruments
Interest expense recorded on interest rate swap	5,993,000	$ 6,015,000
Unrealized loss to be reclassified within twelve months	4,494,000
Investment securities pledged as collateral	25,122,000
Collateral pledged from the counterparties to the Company	$ 0

Other Expenses (Details)

Other Expenses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Other Expenses
Debit card expenses	$ 1,840	$ 2,521	$ 5,352	$ 6,606
Consulting and outside services	1,247	1,516	3,651	3,840
Employee expenses	1,055	948	2,969	2,434
Telephone	988	976	2,899	2,881
VIE amortization and other expenses	1,041	773	2,453	1,814
Loan expenses	653	1,062	2,266	2,800
Postage	646	626	2,007	2,296
Printing and supplies	605	733	1,913	2,397
Accounting and audit fees	499	383	1,508	1,053
Business development	641	629	1,434	1,514
ATM expenses	641	250	1,335	768
Checking and operating expenses	564	742	1,291	2,434
Mergers and acquisition expenses	245	228	1,194	1,364
Legal fees	319	177	825	730
Other	1,214	848	3,026	2,705
Total other expenses	$ 12,198	$ 12,412	$ 34,123	$ 35,636

Accumulated Other Comprehensi60

Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Accumulated Other Comprehensive Income (Loss)
Balance, beginning			$ (7,382)	$ 1,989
Other comprehensive income (loss) before reclassification			9,418	11,411
Amounts reclassified from accumulated other comprehensive income (loss)			2,631	3,438
Net current period other comprehensive income (loss)	$ (1,032)	$ (3,575)	12,049	14,849
Balance, end	4,667	16,838	4,667	16,838
Available-For-Sale Securities
Accumulated Other Comprehensive Income (Loss)
Balance, beginning			1,639	13,935
Other comprehensive income (loss) before reclassification			10,520	18,755
Amounts reclassified from accumulated other comprehensive income (loss)			318	399
Net current period other comprehensive income (loss)			10,838	19,154
Balance, end	12,477	33,089	12,477	33,089
Derivatives Used for Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss)
Balance, beginning			(9,021)	(11,946)
Other comprehensive income (loss) before reclassification			(1,102)	(7,344)
Amounts reclassified from accumulated other comprehensive income (loss)			2,313	3,039
Net current period other comprehensive income (loss)			1,211	(4,305)
Balance, end	$ (7,810)	$ (16,251)	$ (7,810)	$ (16,251)

Earnings Per Share (Details)

Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Basic and Diluted Earnings Per Share
Net income available to common stockholders, basic and diluted	$ 36,479	$ 30,957	$ 101,421	$ 90,090
Average outstanding shares - basic	78,004,450	76,288,640	77,379,514	76,195,550
Add: dilutive restricted stock awards	61,492	62,233	63,430	51,501
Average outstanding shares - diluted	78,065,942	76,350,873	77,442,944	76,247,051
Basic earnings per share	$ 0.47	$ 0.40	$ 1.31	$ 1.18
Diluted earnings per share	$ 0.47	$ 0.40	$ 1.31	$ 1.18
Earnings Per Share
Restricted stock awards excluded from the diluted average outstanding share calculation			0	10,677

Fair Value Measurements on a Re

Fair Value Measurements on a Recurring Basis (Details) - Recurring Measurements - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Financial Assets
Total assets measured at fair value on a recurring basis	$ 1,886,517	$ 2,425,477
Financial Liabilities
Total liabilities measured at fair value on a recurring basis	12,748	14,725
Interest rate swaps
Financial Liabilities
Interest rate swaps	12,748	14,725
U.S. government and federal agency
Financial Assets
Investment securities, available-for-sale	34,046	39,407
U.S. government sponsored enterprises
Financial Assets
Investment securities, available-for-sale	19,267	19,570
State and local governments
Financial Assets
Investment securities, available-for-sale	641,973	786,373
Corporate bonds
Financial Assets
Investment securities, available-for-sale	249,990	471,951
Residential mortgage-backed securities
Financial Assets
Investment securities, available-for-sale	838,929	1,007,515
Commercial mortgage-backed securities
Financial Assets
Investment securities, available-for-sale	102,312	100,661
Level 1
Financial Assets
Total assets measured at fair value on a recurring basis	0	0
Financial Liabilities
Total liabilities measured at fair value on a recurring basis	0	0
Level 1 | Interest rate swaps
Financial Liabilities
Interest rate swaps	0	0
Level 1 | U.S. government and federal agency
Financial Assets
Investment securities, available-for-sale	0	0
Level 1 | U.S. government sponsored enterprises
Financial Assets
Investment securities, available-for-sale	0	0
Level 1 | State and local governments
Financial Assets
Investment securities, available-for-sale	0	0
Level 1 | Corporate bonds
Financial Assets
Investment securities, available-for-sale	0	0
Level 1 | Residential mortgage-backed securities
Financial Assets
Investment securities, available-for-sale	0	0
Level 1 | Commercial mortgage-backed securities
Financial Assets
Investment securities, available-for-sale	0	0
Level 2
Financial Assets
Total assets measured at fair value on a recurring basis	1,886,517	2,425,477
Financial Liabilities
Total liabilities measured at fair value on a recurring basis	12,748	14,725
Level 2 | Interest rate swaps
Financial Liabilities
Interest rate swaps	12,748	14,725
Level 2 | U.S. government and federal agency
Financial Assets
Investment securities, available-for-sale	34,046	39,407
Level 2 | U.S. government sponsored enterprises
Financial Assets
Investment securities, available-for-sale	19,267	19,570
Level 2 | State and local governments
Financial Assets
Investment securities, available-for-sale	641,973	786,373
Level 2 | Corporate bonds
Financial Assets
Investment securities, available-for-sale	249,990	471,951
Level 2 | Residential mortgage-backed securities
Financial Assets
Investment securities, available-for-sale	838,929	1,007,515
Level 2 | Commercial mortgage-backed securities
Financial Assets
Investment securities, available-for-sale	102,312	100,661
Level 3
Financial Assets
Total assets measured at fair value on a recurring basis	0	0
Financial Liabilities
Total liabilities measured at fair value on a recurring basis	0	0
Level 3 | Interest rate swaps
Financial Liabilities
Interest rate swaps	0	0
Level 3 | U.S. government and federal agency
Financial Assets
Investment securities, available-for-sale	0	0
Level 3 | U.S. government sponsored enterprises
Financial Assets
Investment securities, available-for-sale	0	0
Level 3 | State and local governments
Financial Assets
Investment securities, available-for-sale	0	0
Level 3 | Corporate bonds
Financial Assets
Investment securities, available-for-sale	0	0
Level 3 | Residential mortgage-backed securities
Financial Assets
Investment securities, available-for-sale	0	0
Level 3 | Commercial mortgage-backed securities
Financial Assets
Investment securities, available-for-sale	$ 0	$ 0

Fair Value Measurements on a No

Fair Value Measurements on a Non-Recurring Basis (Details) - Non-Recurring Measurements - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Assets with a recorded change resulting from re-measuring at fair value on a non-recurring basis
Other real estate owned	$ 1,616	$ 7,839
Collateral-dependent impaired loans, net of ALLL	6,442	5,664
Total assets measured at fair value on a non-recurring basis	8,058	13,503
Level 1
Assets with a recorded change resulting from re-measuring at fair value on a non-recurring basis
Other real estate owned	0	0
Collateral-dependent impaired loans, net of ALLL	0	0
Total assets measured at fair value on a non-recurring basis	0	0
Level 2
Assets with a recorded change resulting from re-measuring at fair value on a non-recurring basis
Other real estate owned	0	0
Collateral-dependent impaired loans, net of ALLL	0	0
Total assets measured at fair value on a non-recurring basis	0	0
Level 3
Assets with a recorded change resulting from re-measuring at fair value on a non-recurring basis
Other real estate owned	1,616	7,839
Collateral-dependent impaired loans, net of ALLL	6,442	5,664
Total assets measured at fair value on a non-recurring basis	$ 8,058	$ 13,503

Quantitative Information about

Quantitative Information about Level 3 Fair Value Measurements (Details) - Non-Recurring Measurements - USD ($) $ in Thousands		9 Months Ended	12 Months Ended
		Sep. 30, 2017	Dec. 31, 2016
Quantitative Information About Level 3 Fair Value Measurements
Fair Value		$ 8,058	$ 13,503
Level 3
Quantitative Information About Level 3 Fair Value Measurements
Fair Value		8,058	13,503
Other real estate owned | Level 3
Quantitative Information About Level 3 Fair Value Measurements
Fair Value			7,839
Other real estate owned | Sales Comparison Approach | Level 3
Quantitative Information About Level 3 Fair Value Measurements
Fair Value		$ 1,616	7,767
Other real estate owned | Combined Approach | Level 3
Quantitative Information About Level 3 Fair Value Measurements
Fair Value			$ 72
Other real estate owned | Minimum Range | Sales Comparison Approach | Level 3
Unobservable Inputs
Selling Costs	[1]	8.00%	6.00%
Adjustment to Comparables	[1]		0.00%
Other real estate owned | Minimum Range | Combined Approach | Level 3
Unobservable Inputs
Selling Costs	[1]		10.00%
Adjustment to Comparables	[1]		10.00%
Other real estate owned | Maximum Range | Sales Comparison Approach | Level 3
Unobservable Inputs
Selling Costs	[1]	10.00%	10.00%
Adjustment to Comparables	[1]		10.00%
Other real estate owned | Maximum Range | Combined Approach | Level 3
Unobservable Inputs
Selling Costs	[1]		10.00%
Adjustment to Comparables	[1]		10.00%
Other real estate owned | Weighted Average Range | Sales Comparison Approach | Level 3
Unobservable Inputs
Selling Costs	[1]	9.30%	6.90%
Adjustment to Comparables	[1]		0.10%
Other real estate owned | Weighted Average Range | Combined Approach | Level 3
Unobservable Inputs
Selling Costs	[1]		10.00%
Adjustment to Comparables	[1]		10.00%
Collateral-dependent Impaired Loans, Net of ALLL | Level 3
Quantitative Information About Level 3 Fair Value Measurements
Fair Value		$ 6,442	$ 5,664
Collateral-dependent Impaired Loans, Net of ALLL | Sales Comparison Approach | Level 3
Quantitative Information About Level 3 Fair Value Measurements
Fair Value		3,020	1,982
Collateral-dependent Impaired Loans, Net of ALLL | Cost Approach | Level 3
Quantitative Information About Level 3 Fair Value Measurements
Fair Value		17	110
Collateral-dependent Impaired Loans, Net of ALLL | Combined Approach | Level 3
Quantitative Information About Level 3 Fair Value Measurements
Fair Value		$ 3,405	$ 3,572
Collateral-dependent Impaired Loans, Net of ALLL | Minimum Range | Sales Comparison Approach | Level 3
Unobservable Inputs
Selling Costs	[1]	6.00%	8.00%
Collateral-dependent Impaired Loans, Net of ALLL | Minimum Range | Cost Approach | Level 3
Unobservable Inputs
Selling Costs	[1]	20.00%	6.00%
Collateral-dependent Impaired Loans, Net of ALLL | Minimum Range | Combined Approach | Level 3
Unobservable Inputs
Selling Costs	[1]	10.00%	10.00%
Adjustment to Comparables	[1]	20.00%	20.00%
Collateral-dependent Impaired Loans, Net of ALLL | Maximum Range | Sales Comparison Approach | Level 3
Unobservable Inputs
Selling Costs	[1]	10.00%	10.00%
Collateral-dependent Impaired Loans, Net of ALLL | Maximum Range | Cost Approach | Level 3
Unobservable Inputs
Selling Costs	[1]	20.00%	20.00%
Collateral-dependent Impaired Loans, Net of ALLL | Maximum Range | Combined Approach | Level 3
Unobservable Inputs
Selling Costs	[1]	10.00%	10.00%
Adjustment to Comparables	[1]	20.00%	20.00%
Collateral-dependent Impaired Loans, Net of ALLL | Weighted Average Range | Sales Comparison Approach | Level 3
Unobservable Inputs
Selling Costs	[1]	9.20%	9.60%
Collateral-dependent Impaired Loans, Net of ALLL | Weighted Average Range | Cost Approach | Level 3
Unobservable Inputs
Selling Costs	[1]	20.00%	6.60%
Collateral-dependent Impaired Loans, Net of ALLL | Weighted Average Range | Combined Approach | Level 3
Unobservable Inputs
Selling Costs	[1]	10.00%	10.00%
Adjustment to Comparables	[1]	20.00%	20.00%
[1]	The range for selling costs and adjustments to comparables indicate reductions to the fair value.

Carrying Amount and Fair Value

Carrying Amount and Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Carrying Amount
Financial assets
Cash and cash equivalents	$ 220,210	$ 152,541
Investment securities, available-for-sale	1,886,517	2,425,477
Investment securities, held-to-maturity	655,128	675,674
Loans held for sale	48,709	72,927
Loans receivable, net of ALLL	6,379,857	5,554,891
Accrued interest receivable	50,492	45,832
Non-marketable equity securities	21,890	25,550
Total financial assets	9,262,803	8,952,892
Financial liabilities
Deposits	7,767,154	7,372,279
FHLB advances	153,685	251,749
Repurchase agreements and other borrowed funds	461,839	478,090
Subordinated debentures	126,099	125,991
Accrued interest payable	3,154	3,584
Interest rate swaps	12,748	14,725
Total financial liabilities	8,524,679	8,246,418
Estimated Fair Value | Level 1
Financial assets
Cash and cash equivalents	220,210	152,541
Investment securities, available-for-sale	0	0
Investment securities, held-to-maturity	0	0
Loans held for sale	48,709	72,927
Loans receivable, net of ALLL	0	0
Accrued interest receivable	50,492	45,832
Non-marketable equity securities	0	0
Total financial assets	319,411	271,300
Financial liabilities
Deposits	6,735,130	6,090,879
FHLB advances	0	0
Repurchase agreements and other borrowed funds	0	0
Subordinated debentures	0	0
Accrued interest payable	3,154	3,584
Interest rate swaps	0	0
Total financial liabilities	6,738,284	6,094,463
Estimated Fair Value | Level 2
Financial assets
Cash and cash equivalents	0	0
Investment securities, available-for-sale	1,886,517	2,425,477
Investment securities, held-to-maturity	671,198	689,089
Loans held for sale	0	0
Loans receivable, net of ALLL	6,172,843	5,380,286
Accrued interest receivable	0	0
Non-marketable equity securities	21,890	25,550
Total financial assets	8,752,448	8,520,402
Financial liabilities
Deposits	1,035,141	1,283,532
FHLB advances	153,814	257,643
Repurchase agreements and other borrowed funds	461,839	478,090
Subordinated debentures	90,845	85,557
Accrued interest payable	0	0
Interest rate swaps	12,748	14,725
Total financial liabilities	1,754,387	2,119,547
Estimated Fair Value | Level 3
Financial assets
Cash and cash equivalents	0	0
Investment securities, available-for-sale	0	0
Investment securities, held-to-maturity	0	0
Loans held for sale	0	0
Loans receivable, net of ALLL	118,816	123,382
Accrued interest receivable	0	0
Non-marketable equity securities	0	0
Total financial assets	118,816	123,382
Financial liabilities
Deposits	0	0
FHLB advances	0	0
Repurchase agreements and other borrowed funds	0	0
Subordinated debentures	0	0
Accrued interest payable	0	0
Interest rate swaps	0	0
Total financial liabilities	$ 0	$ 0

Mergers and Acquisitions Consid

Mergers and Acquisitions Consideration Transferred, Identifiable Net Assets Acquired and Goodwill Recognized (Details) - USD ($)		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Liabilities assumed
Goodwill recognized		$ 0	$ 6,415,000	$ 30,758,000	$ 6,415,000
The Foothills Bank
Fair value of consideration transferred
Fair value of Company shares issued, net of equity issuance costs				46,673,000
Cash consideration for outstanding shares				17,342,000
Contingent consideration				0
Total fair value of consideration transferred				64,015,000
Identifiable assets acquired
Cash and cash equivalents		13,251,000		13,251,000
Investment securities		25,420,000		25,420,000
Loans receivable		292,529,000		292,529,000
Core deposit intangible	[1]	4,331,000		4,331,000
Accrued income and other assets		19,699,000		19,699,000
Total identifiable assets acquired		355,230,000		355,230,000
Liabilities assumed
Deposits		296,760,000		296,760,000
FHLB advances		22,800,000		22,800,000
Accrued expenses and other liabilities		2,264,000		2,264,000
Total liabilities assumed		321,824,000		321,824,000
Total identifiable net assets		$ 33,406,000		33,406,000
Goodwill recognized				$ 30,609,000
Core Deposit Intangible, Weighted Average Useful Life				10 years
[1]	The core deposit intangible for this acquisition was determined to have an estimated life of 10 years.

Mergers and Acquisitions Pro Fo

Mergers and Acquisitions Pro Forma Summary (Details) - 2017 acquisitions - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Pro Forma Information
Net interest income and non-interest income	$ 119,997	$ 110,969	$ 345,068	$ 324,277
Net income	$ 36,479	$ 32,217	$ 99,231	$ 93,005

Mergers and Acquisitions (Detai

Mergers and Acquisitions (Details Textual) - The Foothills Bank	9 Months Ended
	Sep. 30, 2017USD ($)shares
Business Acquisition
Business Acquisition, Effective Date of Acquisition	Apr. 30, 2017
Percentage of Outstanding Common Stock Acquired	100.00%
Business Combination, Consideration Transferred	$ 64,015,000
Number of Shares Issued for Aquisition | shares	1,381,661
Cash consideration for outstanding shares	$ 17,342,000
Loans receivable	292,529,000
Loans Receivable Acquired, Gross Principal and Contractual Interest Due	303,527,000
Third-party Acquisition Related Costs	877,000
Net interest income and non-interest income	8,579,000
Net income	$ 1,853,000

Subsequent Event Subsequent Eve

Subsequent Event Subsequent Event (Details Textual) - USD ($)	Oct. 26, 2017	Sep. 30, 2017	Dec. 31, 2016
Subsequent Event
Total assets		$ 9,798,602,000	$ 9,450,600,000
Gross loans		$ 6,509,433,000	$ 5,684,463,000
First Security Bank
Subsequent Event
Subsequent Event, Description	the Company announced the signing of a definitive agreement to acquire Inter-Mountain Bancorp, Inc. and its wholly-owned subsidiary, First Security Bank, a community bank based in Bozeman, Montana
Total assets	$ 1,009,623,000
Gross loans	657,626,000
Total deposits	$ 873,572,000