Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Operating Activities
Net income	$ 68,499	$ 66,538	$ 53,117
Items not requiring (providing) cash
Provision for loan losses	20,751	1,976	2,906
Depreciation and amortization	10,589	9,688	6,813
Share based compensation	132	215	251
Mortgage servicing rights income	(737)	(2,106)	(2,060)
Mortgage servicing rights, net impairment	4,453	192	(60)
Premium amortization on securities, net	9,067	5,929	5,798
Loss (gain) on sale of investment securities	(4,297)	75	443
Gain on sale of mortgage loans	(26,721)	(9,208)	(6,613)
Proceeds from sales of loans	601,336	275,809	197,492
Loans originated for sale	(584,065)	(269,651)	(188,823)
Change in cash value life insurance	(2,243)	(2,190)	(1,912)
Loss (gain) on other real estate owned	(197)	(126)	(209)
Net change in:
Interest receivable	(2,568)	(2,101)	(1,180)
Interest payable	(350)	205	1,145
Other assets	(13,987)	99,735	4,520
Other liabilities	(897)	(608)	658
Net cash provided by operating activities	78,765	174,372	72,286
Investing Activities
Purchases of securities available for sale	(590,305)	(425,879)	(214,706)
Proceeds from sales, maturities, calls and principal repayments of securities available for sale	318,897	248,422	123,377
Purchases of securities held to maturity	0	0	(28,374)
Proceeds from maturities of securities held to maturity	37,529	8,384	8,301
Net change in interest-earning time deposits	(510)	7,289	717
Change in Federal Reserve and FHLB stock	(576)	(803)	32
Net change in loans	(234,166)	(59,420)	(182,637)
Proceeds on the sale of OREO and repossessed assets	2,047	4,744	3,258
Change in premises and equipment, net	(5,866)	(4,612)	(3,434)
Death benefit on bank owned life insurance	264	580	154
Purchases of bank owned life insurance	0	0	(10,450)
Repurchase of outstanding stock	(19,636)	(1,595)	0
Net cash used in investing activities	(492,322)	(94,145)	(303,762)
Net change in:
Deposits	600,131	50,282	258,373
Borrowings	(74,725)	(71,040)	(13,589)
Proceeds from issuance of stock	1,390	1,705	622
Net proceeds from issuance of subordinated notes	58,824	0	0
Dividends paid on common stock	(21,183)	(20,835)	(15,418)
Net cash provided by (used in) financing activities	564,437	(39,888)	229,988
Net Change in Cash and Cash Equivalents	150,880	40,339	(1,488)
Cash and Cash Equivalents, Beginning of Period	98,831	58,492	59,980
Cash and Cash Equivalents, End of Period	249,711	98,831	58,492
Salin
Investing Activities
Net cash received in acquisition	$ 0	$ 128,745	$ 0