Consolidated Statements of Cash Flow - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 167,630	$ 99,586	$ 134,879
Adjustments to reconcile to net cash provided by operating activities:
(Benefit from) provision for credit losses	(8,690)	62,648	8,287
Depreciation and amortization	20,041	18,424	15,989
Net amortization of securities premiums and discounts	4,409	(94)	(4,282)
Realized securities (gains) losses	(1,047)	389	(812)
Gain on sales of loans	(7,282)	(6,067)	(3,619)
Cash receipts from the sale of loans originated for sale	369,301	415,589	238,324
Cash disbursements for loans originated for sale	(354,674)	(430,653)	(237,543)
Deferred income tax provision (benefit)	7,044	(9,491)	1,148
Gain on other assets	(3,379)	(2,345)	(1,372)
Decrease/(increase) in interest receivable	4,214	(325)	887
Decrease in interest payable	(617)	(1,641)	(17)
Amortization of stock-based compensation arrangements of subsidiaries	2,133	1,516	1,277
Excess tax benefit from stock-based compensation arrangements	(1,932)	(500)	(928)
Other, net	(7,363)	7,305	6,740
Net cash provided by operating activities	189,788	154,341	158,958
INVESTING ACTIVITIES
Net cash received from acquisitions, net of cash paid	12,599	18,397	77,672
Net cash paid from sale of assets and liabilities, net of cash received	(13,733)
Net decrease/(increase) in federal funds sold	14,200	1,000	(1,000)
Purchases of held for investment debt securities	(845)	(1,395)	(1,010)
Purchases of available for sale debt securities	(462,304)	(605,069)	(174,090)
Proceeds from maturities, calls and paydowns of held for investment debt securities	831	561	535
Proceeds from maturities, calls and paydowns of available for sale debt securities	506,737	547,729	508,293
Purchase of equity securities	(904)	(811)	(3,966)
Proceeds from paydowns and sales of equity securities	1,459	445	2,178
Net change in loans	404,393	(798,024)	(310,053)
Purchases of premises, equipment and computer software	(27,251)	(66,446)	(27,054)
Purchase of tax credits	(7,456)	(2,200)	(29,025)
Other, net	9,305	7,820	7,867
Net cash provided by (used in) investing activities	437,031	(897,993)	50,347
FINANCING ACTIVITIES
Net change in deposits	(191,737)	536,063	274,218
Net change in short-term borrowings	(1,100)		(575)
Proceeds from long-term borrowings		3,000
Paydown of long-term borrowings		(3,000)
Issuance of common stock in connection with stock options, net	2,260	1,790	2,484
Common stock acquired	(11,663)	(3,098)	(1,601)
Proceeds from issuance of subordinated notes, net of debt issuance costs	59,150
Net cash settlement of options	(5,479)
Cash dividends paid	(45,140)	(42,472)	(39,805)
Net cash (used in) provided by financing activities	(193,709)	492,283	234,721
Net increase/(decrease) in cash, due from banks and interest-bearing deposits	433,110	(251,369)	444,026
Cash, due from banks and interest-bearing deposits at the beginning of the period	1,616,912	1,868,281	1,424,255
Cash, due from banks and interest-bearing deposits at the end of the period	2,050,022	1,616,912	1,868,281
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Cash paid during the period for interest	11,993	22,056	54,602
Cash paid during the period for income taxes	30,600	26,525	30,975
Noncash investing and financing activities:
Cash consideration for acquisitions	21,000	2,861	123,457
Fair value of assets acquired in acquisitions	283,711	47,838	729,378
Liabilities assumed in acquisitions	257,915	45,040	605,921
Unpaid common stock dividends declared	$ 11,737	$ 11,125	$ 10,453