CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Operating activities:
Net income	$ 40,134	$ 41,946
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	4,079	3,830
Amortization of intangible assets	3,667	4,130
Net accretion on securities, loans and borrowings	(2,113)	(1,944)
Stock-based compensation	1,952	1,391
Provision for credit losses	5,594	2,422
Amortization of mortgage servicing rights	82	98
Unrealized loss (gain) on equity securities	30	(31)
Income from bank-owned life insurance policies	(408)	(391)
Net loss on sale of loans and other assets	9	22
Change in other assets and other liabilities	(26,332)	(16,864)
Net cash provided by operating activities	26,694	34,609
Investing activities:
Proceeds from maturities, calls, and paydowns of available-for-sale investment securities	61,753	52,520
Proceeds from maturities and redemptions of equity and other investment securities	404	2,460
Purchases of available-for-sale investment securities	(34,597)	(13,388)
Purchases of equity and other securities	(18)	(24)
Net decrease in loans	25,446	11,847
Cash paid for acquisitions, net of cash acquired of $0 and $0, respectively	0	(1,200)
Purchases of premises and equipment, net	(3,020)	(1,227)
Real estate tax credit investments	(550)	(564)
Net cash provided by investing activities	49,418	50,424
Financing activities:
Net increase in deposits	309,015	297,291
Net decrease in borrowings	(45,040)	(63,910)
Issuance of common stock	6,399	(844)
Purchases of treasury stock	(74)	(79)
Sales of treasury stock	79	1,885
Increase in deferred compensation arrangements	74	79
Cash dividends paid	(21,268)	(19,806)
Withholding taxes paid on share-based compensation	(991)	(3,119)
Net cash provided by financing activities	248,194	211,497
Change in cash and cash equivalents	324,306	296,530
Cash and cash equivalents at beginning of period	205,030	211,834
Cash and cash equivalents at end of period	529,336	508,364
Supplemental disclosures of cash flow information:
Cash paid for interest	6,888	5,684
Cash paid for income taxes	9,642	4,486
Supplemental disclosures of noncash financing and investing activities:
Dividends declared and unpaid	21,441	19,578
Transfers from loans to other real estate	$ 779	$ 412