CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating Activities
Net Income	$ 138,257	$ 73,447	$ 105,333
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	(1,376)	56,718	14,533
Deferred Income Taxes and Tax Credits	1,432	(8,217)	2,292
Depreciation and amortization	11,442	11,653	10,370
Net gains on securities and other assets	(22,273)	(18,807)	(10,671)
Net amortization of premiums and discounts on securities	4,772	6,183	3,892
Income from increase in cash surrender value of bank owned life insurance	(6,105)	(6,288)	(5,998)
Mortgage loans originated for sale	(390,940)	(410,715)	(251,428)
Proceeds from Sale of Mortgage Loans Held-for-sale	419,574	408,877	251,968
Decrease (increase) in interest receivable	5,885	(10,735)	423
Decrease in interest payable	(412)	(879)	(256)
Increase (decrease) in income taxes payable	10,664	(887)	1,484
Other—net	(5,874)	5,349	(14,310)
Net cash provided by operating activities	165,046	105,699	107,632
Transactions with securities held to maturity:
Proceeds from Sale and Maturity of Held-to-maturity Securities	0	0	948
Proceeds from maturities and redemptions	120,728	118,905	54,632
Purchases	(361,734)	(85,679)	(200)
Transactions with securities available for sale:
Proceeds from sales	0	0	0
Proceeds from maturities and redemptions	433,910	472,282	189,194
Purchases	(676,861)	(411,178)	(138,670)
Purchases of FHLB stock	(4,453)	(22,231)	(36,850)
Proceeds from the redemption of FHLB stock	3,342	26,766	52,215
Proceeds from Sale of Other Investments	500	0	0
Proceeds from bank owned life insurance	7,357	1,444	557
Proceeds from the sale of loans	76,414	41,141	37,534
Proceeds from sales of other assets	7,798	5,531	6,822
Acquisition, net of cash acquired	0	0	332,468
Net increase in loans	(161,667)	(622,504)	(358,328)
Purchases of premises and equipment	(10,639)	(7,615)	(17,380)
Net cash (used in) provided by investing activities	(565,305)	(483,138)	122,942
Financing Activities
Net decrease in federal funds purchased	0	0	(11,000)
Net increase (decrease) in other short-term borrowings	20,942	(84,480)	(508,970)
Net increase in deposits	543,947	761,398	308,783
Repayments of other long-term debt	(50,685)	(659)	(634)
Proceeds from Issuance of Long-term Debt	0	0	50,000
Repayments of Long-term Capital Lease Obligations	464	430	402
Dividends paid	(43,611)	(42,982)	(39,394)
Proceeds from reissuance of treasury stock	222	222	211
Purchase of treasury stock	(31,301)	(20,905)	(6,259)
Net cash provided by (used in) financing activities	439,050	612,164	(207,665)
Net increase in cash and cash equivalents	38,791	234,725	22,909
Cash and cash equivalents at January 1	356,581	121,856	98,947
Cash and cash equivalents at December 31	$ 395,372	$ 356,581	$ 121,856