CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
OPERATING ACTIVITIES
Net Income		$ 110,343	$ 21,040	$ 98,234
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	[1]	16,215	131,424	14,873
Provision for unfunded loan commitments		0	0	436
Depreciation and amortization		11,480	12,066	11,724
Net amortization of discounts and premiums		5,482	4,205	3,243
Stock-based compensation expense		2,427	724	2,441
Securities (gains) losses		(29)	(142)	26
Deferred income taxes		2,383	(4,402)	(381)
Loss (gain) on sale of fixed assets		30	(23)	37
Gain on the sale of loans, net		(8,856)	(8,998)	(1,887)
Pension contribution		0	(115)	0
Net change in:
Mortgage loans originated for sale		(286,257)	(361,704)	(109,624)
Proceeds from sale of mortgage loans		311,479	357,613	109,082
Net decrease (increase) in interest receivable		3,561	(2,560)	(3,768)
Net decrease in interest payable		(2,087)	(3,178)	(2,223)
Net decrease (increase) in other assets		85,509	(142,891)	(8,286)
Net (decrease) increase in other liabilities		(35,569)	50,392	24,496
Net Cash Provided by Operating Activities		216,111	53,451	138,423
INVESTING ACTIVITIES
Purchases of securities available-for-sale		(313,617)	(178,389)	(129,973)
Proceeds from maturities, prepayments and calls of securities available-for-sale		144,905	205,606	92,412
Proceeds from sales of securities available-for-sale		1,917	1,349	59,934
Purchases of Federal Home Loan Bank stock		(22,515)	(33,755)	(61,852)
Proceeds from redemption of Federal Home Loan Bank stock		26,026	43,702	68,467
Net decrease (increase) in loans		173,401	(194,768)	(298,741)
Proceeds from the sale of loans not originated for resale		5,107	547	520
Purchases of premises and equipment		(3,611)	(5,416)	(5,153)
Proceeds from the sale of premises and equipment		14	23	71
Net cash acquired from bank acquisitions		0	0	63,759
Proceeds from settlement of bank owned life insurance		353	0	0
Net Cash Provided by (Used in) Investing Activities		11,980	(161,101)	(210,556)
FINANCING ACTIVITIES
Net increase in core deposits		875,378	591,932	423,203
Net decrease in certificates of deposit		(299,292)	(207,106)	(27,632)
Net increase in securities sold under repurchase agreements		19,328	45,275	1,505
Net decrease in short-term borrowings		(75,000)	(206,319)	(200,000)
Proceeds from long-term borrowings		0	0	10,000
Repayments of long-term borrowings		(11,001)	(27,187)	(35,936)
Treasury shares issued - net		(630)	(594)	(915)
Repurchase common stock		0	(12,559)	(18,222)
Costs to issue equity securities		0	0	(176)
Cash dividends paid to common shareholders		(44,325)	(43,949)	(37,360)
Net Cash Provided by Financing Activities		464,458	139,493	114,467
Net increase in cash and cash equivalents		692,549	31,843	42,334
Cash and cash equivalents at beginning of year		229,666	197,823	155,489
Cash and Cash Equivalents at End of Year		922,215	229,666	197,823
Supplemental Disclosures
Interest paid		15,236	44,353	75,278
Income taxes paid, net of refunds		24,213	6,231	14,663
Loans transferred to held for sale		4,467	640	456
Leased right-of-use operating assets and lease liabilities added to Balance Sheet		2,987	91	49,490
Net assets (liabilities) from acquisitions, excluding cash and cash equivalents		0	0	43,637
Transfers to other real estate owned and other repossessed assets		$ 12,392	$ 631	$ 2,592

[1] (1)Beginning January 1, 2020, provision for credit losses is based on current expected credit loss methodology due to the adoption of CECL. Prior to January 1, 2020, it was based on incurred loss methodology.