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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      
Interest and dividends received $ 410,155 $ 400,867 $ 438,795
Service charges and other fees received 37,782 39,525 42,489
Interest paid (6,010) (13,627) (21,193)
Net cash paid to vendors, employees and others (176,807) (168,036) (182,568)
Income taxes (69,878) (73,633) (69,341)
Net cash provided by operating activities 195,242 185,096 208,182
Cash Flows from Investing Activities      
Net change in interest-earning balances from depository institutions 17,564 (40,632) 4,739
Proceeds from sale of investment securities held-for-sale 0 0 152,644
Proceeds from repayment of investment securities available-for-sale 775,538 642,576 364,126
Proceeds from maturity of investment securities available-for-sale 330 9,807 7,109
Purchases of investment securities available-for-sale (1,648,575) (1,231,163) (492,995)
Proceeds from repayment and maturity of investment securities held-to-maturity 152,575 146,309 114,569
Purchases of investment securities held-to-maturity (1,510,112) (52,855) (47,587)
Net increase in equity investments (4,010) (3,608) (16,488)
Net decrease (increase) in loan and lease finance receivables (497,293) 743,290 (231,105)
Proceeds on eminent domain condemnation, net 0 0 5,685
Proceeds from sale of building, net of selling costs 1,157 2,131 5,755
Purchase of premises and equipment (4,677) (4,672) (5,522)
Purchase of BOLI (25,000) 0 0
Proceeds from BOLI death benefit 12,414 5,477 1,660
Proceeds from sales of other real estate owned 5,012 1,162 523
Net cash used in investing activities (1,730,491) (1,268,758) 325,323
Cash Flows from Financing Activities      
Net increase in other deposits 1,313,953 3,076,187 (36,926)
Net decrease in time deposits (74,012) (44,614) (85,636)
Net (decrease) increase in other borrowings (2,719) 5,000 (280,000)
Net increase in customer repurchase agreements 202,982 10,747 (13,596)
Repayment of junior subordinated debentures (25,774) 0 0
Cash dividends on common stock (97,733) (98,475) (95,352)
Repurchase of common stock (8,337) (92,772) (2,640)
Proceeds from exercise of stock options 1,277 231 2,215
Net cash provided by financing activities 1,309,637 2,856,304 (511,935)
Net (decrease) increase in cash and cash equivalents (225,612) 1,772,642 21,570
Cash and cash equivalents, beginning of period 1,958,160 185,518 163,948
Cash and cash equivalents, end of period 1,732,548 1,958,160 185,518
Reconciliation of Net Earnings to Net Cash Provided by Operating Activities      
Net earnings 212,521 177,159 207,827
Adjustments to reconcile net earnings to net cash provided by operating activities:      
Gain on sale of investment securities, net 0 0 (5)
Gain on eminent domain condemnation, net 0 0 (5,685)
Gain on sale of building, net (189) (1,680) (4,776)
Gain on sale of other real estate owned (1,177) (365) (105)
Increase in BOLI (8,500) (5,303) (5,670)
Net amortization of premiums and discounts on investment securities 32,232 15,045 10,298
Accretion of discount for acquired loans, net (12,270) (17,412) (28,831)
(Recapture of) provision for credit losses (25,500) 23,500 5,000
(Recapture of) provision for unfunded loan commitments (1,000) 0  
Valuation allowance on other real estate owned 0 700 0
Stock-based compensation 5,183 5,529 5,548
Depreciation and amortization, net (6,426) (1,157) 22,036
Change in other assets and liabilities 368 (10,920) 2,545
Total adjustments (17,279) 7,937 355
Net cash provided by operating activities 195,242 185,096 208,182
Supplemental Disclosure of Non-cash Investing Activities      
Securities purchased and not settled 50,340 60,113 0
Transfer of loans to other real estate owned $ 443 $ 0 $ 4,889