CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020
Cash flows from operating activities:
Net income		$ 71,450	$ 59,745
Adjustments to reconcile net income to net cash from operating activities:
Depreciation		4,555	4,477
Provision for credit losses	[1]	1,077
Provision for credit losses	[1]		13,850
Gain on sale and write down of other real estate owned		(53)	0
Amortization of loan servicing rights		1,697	563
Net change in loan servicing rights valuation allowance		(197)	628
Loans originated for sale, including participations		(92,728)	(93,805)
Net gain on sales of loans		(3,609)	(3,286)
Proceeds from sale of loans, including participations		98,655	90,568
Net (gain) loss on sales of premises and equipment		4	82
Net gain on sales and calls of securities available-for-sale		(797)	(363)
Net securities amortization		3,457	3,021
Stock based compensation expense		6,135	822
Earnings on life insurance		(2,101)	(1,476)
Gain on life insurance		(404)	(576)
Tax benefit of stock award issuances		(266)	(71)
Net change:
Interest receivable and other assets		(2,090)	(3,987)
Interest payable and other liabilities		1,196	(8,927)
Total adjustments		14,531	1,520
Net cash from operating activities		85,981	61,265
Cash flows from investing activities:
Proceeds from sale of securities available- for-sale		13,964	6,413
Proceeds from maturities, calls and principal paydowns of securities available-for-sale		102,399	69,259
Purchases of securities available-for-sale		(640,364)	(89,934)
Purchase of life insurance		(648)	(361)
Net (increase) decrease in total loans		410,323	(527,886)
Proceeds from sales of land, premises and equipment		6	651
Purchases of land, premises and equipment		(5,265)	(5,154)
Proceeds from sales of other real estate		946	0
Proceeds from life insurance		931	1,285
Net cash from investing activities		(117,708)	(545,727)
Cash flows from financing activities:
Net increase in total deposits		377,833	634,135
Net increase (decrease) in short-term borrowings		(10,500)	10,500
Payments on short-term FHLB borrowings		0	(170,000)
Proceeds from long-term FHLB borrowings		0	75,000
Common dividends paid		(25,973)	(22,938)
Preferred dividends paid		(13)	(13)
Payments related to equity incentive plans		(1,818)	(2,030)
Purchase of treasury stock		(496)	(10,492)
Net cash from financing activities		339,033	514,162
Net change in cash and cash equivalents		307,306	29,700
Cash and cash equivalents at beginning of the period		249,927	99,381
Cash and cash equivalents at end of the period		557,233	129,081
Cash paid during the period for:
Interest		14,859	30,255
Income taxes		20,637	14,380
Supplemental non-cash disclosures:
Loans transferred to other real estate owned		893	35
Securities purchases payable		$ 4,982	$ 7,712

[1] Beginning January 1, 2021 calculation is based on the current expected credit loss methodology. Prior to January 1, 2021 calculation was based on the incurred loss methodology.