Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash flows from operating activities:
Net income	$ 30,890	$ 27,913
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of intangibles	2,454	2,598
Provision for loan losses	200	5,400
Deferred tax expense	3,184	2,015
Amortization of operating lease right-of-use assets	1,542	0
Net decrease in operating lease liabilities	(1,598)	0
Income on Bank-owned life insurance	(1,696)	(1,264)
Net amortization of premiums and discounts on securities	1,756	2,279
Accretion of net deferred loan fees	(1,220)	(1,286)
Amortization of premiums on purchased loans, net	160	200
Net increase in loans originated for sale	(3,942)	(4,117)
Proceeds from sales of loans originated for sale	4,215	4,528
Proceeds from sales and paydowns of foreclosed assets	585	466
ESOP expense	1,075	1,085
Allocation of stock award shares	1,388	1,025
Allocation of stock options	42	45
Net gain on sale of loans	(273)	(411)
Net gain on securities transactions	0	(1)
Net gain on sale of foreclosed assets	(57)	(181)
Decrease (increase) in accrued interest receivable	295	(924)
Decrease in other assets	6,148	1,146
Decrease in other liabilities	(13,780)	(8,309)
Net cash provided by operating activities	31,368	32,207
Cash flows from investing activities:
Proceeds from maturities, calls and paydowns of held to maturity debt securities	11,432	21,934
Purchases of held to maturity debt securities	(5,780)	(11,881)
Proceeds from maturities, calls and paydowns of available for sale debt securities	40,258	55,279
Purchases of available for sale debt securities	(50,384)	(72,154)
Proceeds from redemption of Federal Home Loan Bank stock	31,536	39,929
Purchases of Federal Home Loan Bank stock	(31,357)	(33,342)
Net decrease in loans	27,579	34,994
Purchases of premises and equipment	(593)	(502)
Net cash provided by investing activities	22,691	34,257
Cash flows from financing activities:
Net increase in deposits	73,334	42,417
Increase in mortgage escrow deposits	1,795	1,061
Cash dividends paid to stockholders	(28,964)	(13,638)
Shares issued dividend reinvestment plan	840	419
Purchase of treasury stock	(180)	0
Purchase of employee restricted shares to fund statutory tax withholding	(1,914)	(1,792)
Stock options exercised	15	175
Proceeds from long-term borrowings	85,000	265,000
Payments on long-term borrowings	(213,360)	(135,810)
Net increase (decrease) in short-term borrowings	84,568	(281,616)
Net cash provided by (used in) financing activities	1,134	(123,784)
Net increase (decrease) in cash and cash equivalents	55,193	(57,320)
Cash and cash equivalents at beginning of period	142,661	190,834
Cash and cash equivalents at end of period	197,854	133,514
Cash paid during the period for:
Interest on deposits and borrowings	17,377	12,972
Income taxes	100	3,619
Non cash investing activities:
Initial recognition of operating lease right-of-use assets	44,946	0
Initial recognition of operating lease liabilities	46,050	0
Transfer of loans receivable to foreclosed assets	$ 227	$ 673