Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash flows from operating activities:
Net income	$ 45,200	$ 32,514
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of premises and equipment	6,581	4,606
Allocation of ESOP stock	1,249	692
Stock awards	2,530	1,678
Net excess tax benefit on stock compensation	(722)	(1,700)
Amortization of servicing asset	86	67
Net premium amortization in excess of discount accretion on securities	2,988	2,153
Net amortization of deferred costs on borrowings	196	33
Amortization of core deposit intangible	2,828	1,544
Net accretion of purchase accounting adjustments	(12,807)	(6,281)
Net amortization of deferred costs and discounts on loans	493	300
Provision for loan losses	2,984	3,030
Net loss on sale and write-down of other real estate owned	1,949	737
Write down of fixed assets held for sale to net realizable value	3,744	6,350
Net (gain) loss on sale of fixed assets	(26)	13
Net unrealized loss on equity securities	282	0
Net gain on sales of loans	(654)	(74)
Proceeds from sales of mortgage loans held for sale	2,053	3,837
Mortgage loans originated for sale	(2,503)	(2,551)
Increase in value of Bank Owned Life Insurance	(3,813)	(2,436)
Net gain on sale of assets held for sale	(1,166)	0
Increase in interest and dividends receivable	(947)	(1,638)
Decrease in other assets	13,452	4,012
(Decrease) increase in other liabilities	(1,744)	15,810
Total adjustments	17,033	30,182
Net cash provided by operating activities	62,233	62,696
Cash flows from investing activities:
Net decrease (increase) in loans receivable	85,935	(57,646)
Proceeds from sale of under performing loans	8,724	6,022
Purchase of loans receivable	(147,563)	(16,627)
Purchase of debt investment securities available-for-sale	(28,010)	(54,810)
Purchase of debt investment securities held-to-maturity	(4,017)	(111,593)
Purchase of debt mortgage-backed securities held-to-maturity	0	(120,210)
Purchase of equity investments	(138)	0
Proceeds from maturities and calls of debt investment securities available-for-sale	14,001	0
Proceeds from maturities and calls of debt investment securities held-to-maturity	41,246	13,020
Proceeds from Bank Owned Life Insurance	2,708	310
Proceeds from the redemption of restricted equity investments	83,806	19,010
Purchases of restricted equity investments	(104,408)	(18,169)
Proceeds from sales of other real estate owned	646	2,777
Proceeds from sales of assets held for sale	7,488	0
Purchases of premises and equipment	(10,424)	(9,031)
Cash consideration paid for acquisition, net of cash received	(3,743)	0
Net cash provided by (used in) investing activities	37,968	(273,634)
Cash flows from financing activities:
(Decrease) increase in deposits	(103,522)	163,182
Increase in short-term borrowings	122,376	5,391
Proceeds from Federal Home Loan Bank advances	0	10,000
Repayments of Federal Home Loan Bank advances	(56,607)	(1,438)
Repayments of other borrowings	(342)	0
Increase in advances by borrowers for taxes and insurance	5,498	341
Exercise of stock options	4,936	3,192
Payment of employee taxes withheld from stock awards	(3,235)	(1,406)
Acquisition of common stock by ESOP	(8,400)	0
Dividends paid	(21,425)	(14,439)
Net cash (used in) provided by financing activities	(60,721)	164,823
Net increase (decrease) in cash and due from banks and restricted cash	39,480	(46,115)
Supplemental Disclosure of Cash Flow Information:
Cash and due from banks and restricted cash at beginning of period	109,613
Restricted cash at beginning of period	0	0
Cash and due from banks and restricted cash at beginning of period	109,613	301,373
Cash and due from banks and restricted cash at end of period	149,093	255,258
Restricted cash at end of period	731	0
Cash and due from banks and restricted cash at end of period	148,362	255,258
Cash paid during the period for:
Interest	26,637	14,333
Income taxes	143	8
Non-cash activities:
Accretion of unrealized loss on securities reclassified to held-to-maturity	2,690	865
Net loan charge-offs	1,884	1,629
Transfer of premises and equipment to assets held-for-sale	11,092	5,078
Transfer of loans receivable to other real estate owned	640	3,389
Non-cash assets acquired:
Securities	254,522	0
Restricted equity investments	16,967	0
Loans	1,517,172	0
Premises and equipment	19,892	0
Accrued interest receivable	5,621	0
Bank Owned Life Insurance	85,238	0
Deferred tax asset	57,712	0
Other assets	5,246	0
Goodwill and other intangible assets, net	199,500	0
Total non-cash assets acquired	2,161,870	0
Liabilities assumed:
Deposits	1,616,073	0
Borrowings	127,747	0
Other liabilities	11,752	0
Total liabilities assumed	1,755,572	0
Mortgage-backed Securities
Cash flows from investing activities:
Principal repayments on debt mortgage-backed securities held-to-maturity	$ 91,717	$ 73,313