Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating Activities
Net income	$ 93,408	$ 87,091	$ 68,499
Items not requiring (providing) cash
Provision for (recovery of) credit losses	(1,816)	(2,084)	20,751
Depreciation and amortization	10,754	9,802	9,399
Share based compensation	2,475	1,819	1,338
Amortization of mortgage servicing rights	2,345	4,073	2,932
Impairment (recovery) of mortgage servicing rights	(2,594)	(2,578)	4,453
Premium amortization on securities, net	12,148	10,289	9,067
Deferred income taxes	2,177	2,311	(9,421)
Gain on sale of investment securities	0	(914)	(4,297)
Gain on sale of mortgage loans	(7,165)	(19,163)	(26,721)
Proceeds from sales of loans	225,928	453,087	605,256
Loans originated for sale	(215,174)	(437,174)	(593,515)
Gain on cash value life insurance	(2,594)	(2,094)	(2,243)
Gain on other real estate owned	(722)	(85)	(197)
Net change in:
Interest receivable	(9,157)	(4,222)	(2,568)
Interest payable	3,145	(493)	(350)
Other assets	(13,964)	9,633	(4,456)
Other liabilities	(4,814)	(2,948)	931
Net cash provided by operating activities	94,380	106,350	78,858
Investing Activities
Purchases of securities available for sale	(180,198)	(837,684)	(590,305)
Proceeds from sales, maturities, calls and principal repayments of securities available for sale	69,113	287,714	318,897
Purchases of securities held to maturity	(430,457)	(931,029)	0
Proceeds from maturities of securities held to maturity	72,968	30,544	37,529
Net change in interest earning time deposits	1,970	4,183	(510)
Purchase of FHLB stock	(2,435)	(1,417)	(1,161)
Redemption of FHLB stock	198	0	585
Purchase of loans	(55,195)	0	0
Net change in loans	(448,284)	480,028	(239,938)
Proceeds on the sale of OREO and repossessed assets	5,263	1,286	2,047
Premises and equipment expenditures	(6,429)	(1,440)	(5,866)
Purchases of bank owned life insurance	(50,000)	0	0
Proceeds from bank owned life insurance	3,554	783	264
Net cash received in branch acquisition	0	622,179	0
Net cash used in investing activities	(1,019,932)	(344,853)	(478,458)
Financing Activities
Net change in deposits	54,783	425,449	600,131
Proceeds from long–term borrowings	675,000	244,554	133,810
Repayment of long–term borrowings	(755,608)	(76,371)	(123,377)
Net change in short–term borrowings	503,746	0
Net change in short–term borrowings			(98,000)
Net change in repurchase agreements	7,072	21,336	18,521
Net settlement of share awards	(1,824)	(1,355)	0
Exercise of stock options	145	1,062	157
Repurchase of outstanding stock	0	(7,607)	(19,636)
Proceeds from issuance of stock	0	0	1,233
Net proceeds from issuance of subordinated notes	0	0	58,824
Dividends paid on common stock	(27,765)	(24,768)	(21,183)
Net cash provided by (used in) financing activities	455,549	582,300	550,480
Net Change in Cash and Cash Equivalents	(470,003)	343,797	150,880
Cash and Cash Equivalents, Beginning of Period	593,508	249,711	98,831
Cash and Cash Equivalents, End of Period	$ 123,505	$ 593,508	$ 249,711