CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash flows from operating activities:
Net income	$ 95,733	$ 84,337	$ 87,047
Adjustments to reconcile net income to net cash from operating activities:
Depreciation	6,105	6,042	5,930
Provision for credit losses	1,077	14,770	3,235
Net loss on sale and write down of other real estate owned	67	0	0
Amortization of loan servicing rights	2,282	772	528
Net change in loan servicing rights valuation allowance	0	715	0
Loans originated for sale	(119,439)	(117,600)	(66,008)
Net gain on sales of loans	(4,376)	(4,510)	(2,043)
Proceeds from sale of loans	126,391	114,244	64,820
Net (gain) loss on sale of premises and equipment	43	86	(3)
Net (gain) loss on sales and calls of securities available-for-sale	(797)	(433)	(142)
Net amortization of available -for-sale securities	4,959	3,998	3,947
Stock based compensation expense	7,158	1,790	4,187
Earnings on life insurance	(2,467)	(2,105)	(1,890)
Gain on life insurance	(415)	(730)	(841)
Tax benefit of stock award issuances	(330)	(71)	(529)
Net change:
Interest receivable and other assets	(1,852)	(6,315)	(4,733)
Interest payable and other liabilities	(371)	(7,762)	6,534
Total adjustments	18,035	2,891	12,992
Net cash from operating activities	113,768	87,228	100,039
Cash flows from investing activities:
Proceeds from sale of securities available- for-sale	13,964	8,018	57,114
Proceeds from maturities, calls and principal paydowns of securities available-for-sale	137,812	97,998	67,818
Purchases of securities available-for-sale	(835,001)	(216,478)	(129,453)
Purchase of life insurance	(711)	(10,409)	(5,552)
Net increase in total loans	356,660	(587,377)	(152,119)
Proceeds from sales of land, premises and equipment	8	658	14
Purchases of land, premises and equipment	(6,167)	(5,719)	(7,998)
Proceeds from sales of other real estate owned	946	0	0
Proceeds from life insurance	943	1,285	1,483
Net cash from investing activities	(331,546)	(712,024)	(168,693)
Cash flows from financing activities:
Net increase in total deposits	698,602	902,986	89,754
Net increase (decrease) in short-term borrowings	(10,500)	10,500	(75,555)
Payments on short-term FHLB borrowings	0	(170,000)	0
Payments on long-term FHLB borrowings	0	0	0
Proceeds from long-term FHLB borrowings	0	75,000	0
Payments on subordinated debentures	0	0	(30,928)
Common dividends paid	(34,640)	(30,566)	(29,639)
Preferred dividends paid	(13)	(13)	(13)
Payments related to equity incentive plan	(1,914)	(2,137)	(2,109)
Purchase of treasury stock	(559)	(10,547)	(515)
Sales of treasury stock	115	119	118
Net cash from financing activities	651,091	775,342	(48,887)
Net change in cash and cash equivalents	433,313	150,546	(117,541)
Beginning balance	249,927	99,381	216,922
Ending balance	683,240	249,927	99,381
Cash paid during the year for:
Interest	18,471	35,740	58,964
Income taxes	25,947	19,355	21,035
Supplemental non-cash disclosures:
Loans transferred to other real estate owned	893	35	0
Property transferred to held for sale	0	0	0
Right-of-use assets obtained in exchange for lease liabilities	$ 0	$ 0	$ 5,483