Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash flows from operating activities:
Net income	$ 48,559	$ 14,931
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of intangibles	3,264	2,494
Provision (benefit) charge for credit losses	(15,001)	14,717
Credit loss (benefit) expense for off-balance sheet credit exposures	(875)	1,000
Deferred tax expense (benefit)	6,271	(1,492)
Amortization of operating lease right-of-use assets	2,812	2,130
Income on Bank-owned life insurance	(2,567)	(787)
Net amortization of premiums and discounts on securities	3,110	1,913
Accretion of net deferred loan fees	(5,487)	(1,521)
Amortization of premiums on purchased loans, net	190	192
Net increase in loans originated for sale	(14,492)	(4,022)
Proceeds from sales of loans originated for sale	15,260	4,335
Proceeds from sales and paydowns of foreclosed assets	569	256
ESOP expense	913	921
Allocation of stock award shares	959	993
Allocation of stock options	53	47
Net gain on sale of loans	(768)	(313)
Net gain on securities transactions	(197)	(11)
Net gain on sale of premises and equipment	(15)	(641)
Net gain on sale of foreclosed assets	(170)	(29)
(Increase) decrease in accrued interest receivable	(2,567)	1,232
Decrease (increase) in other assets	41,160	(82,099)
(Decrease) increase in other liabilities	(44,565)	79,111
Net cash provided by operating activities	36,416	33,357
Cash flows from investing activities:
Proceeds from maturities, calls and paydowns of held to maturity debt securities	10,236	17,225
Purchases of held to maturity debt securities	(7,541)	(9,674)
Proceeds from sales of securities	9,442	0
Proceeds from maturities and paydowns of available for sale debt securities	90,807	64,466
Purchases of available for sale debt securities	(226,417)	(56,172)
Proceeds from redemption of Federal Home Loan Bank stock	12,147	28,549
Purchases of Federal Home Loan Bank stock	(1,656)	(32,449)
BOLI claim benefits received	0	1,985
Net decrease (increase) in loans	24,217	(39,897)
Proceeds from sales of premises and equipment	15	641
Purchases of premises and equipment	(1,846)	(1,664)
Net cash used in investing activities	(90,596)	(26,990)
Cash flows from financing activities:
Net increase in deposits	459,684	108,151
Increase in mortgage escrow deposits	3,474	1,666
Cash dividends paid to stockholders	(18,075)	(15,496)
Shares issued dividend reinvestment plan	0	451
Purchase of treasury stock	(48)	(4,985)
Purchase of employee restricted shares to fund statutory tax withholding	(915)	(956)
Stock options exercised	638	0
Proceeds from long-term borrowings	400,000	632,554
Payments on long-term borrowings	(619,265)	(300,159)
Net decrease in short-term borrowings	(16,096)	(243,764)
Net cash provided by financing activities	209,397	177,462
Net increase in cash and cash equivalents	155,217	183,829
Cash and cash equivalents at beginning of period	532,353	186,748
Cash and cash equivalents at end of period	687,570	370,577
Cash paid during the period for:
Interest on deposits and borrowings	10,399	15,819
Income taxes	270	115
Non-cash investing activities:
Transfer of loans receivable to foreclosed assets	$ 434	$ 2,067