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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Operating activities:      
Net income $ 300,232 $ 253,922 $ 167,319
Adjustments to reconcile net income to net cash provided by operating activities:      
Provision for credit loss 21,651 7,955 45,379
Specific reserve, other real estate owned 1,627 2,655 1,539
Depreciation of bank premises and equipment 21,821 25,028 28,318
(Gain) loss on sale of bank premises and equipment (3,110) 601 (40)
Gain on sale of other real estate owned (2,096) (170) (892)
Accretion of investment securities discounts (1,785) (702) (500)
Amortization of investment securities premiums 13,907 36,380 39,039
Investment securities transactions, net   16 5
Unrealized loss (gain) on equity securities with readily determinable fair values 721 123 (107)
Proceeds from settlements of claims   2,870  
Stock based compensation expense 449 506 743
Earnings from affiliates and other investments (15,894) (68,034) 74
Deferred income taxes 10,619 3,542 (3,122)
(Increase) decrease in accrued interest receivable (15,194) 7,288 (1,261)
Decrease in other assets 12,975 25,220 42,571
Increase (decrease) in other liabilities 42,018 (5,519) (13,932)
Net cash provided by operating activities 387,941 291,681 305,133
Investing activities:      
Proceeds from maturities of securities 2,200 1,200 1,075
Proceeds from sales and calls of available for sale securities 800 5,890 42,350
Purchases of available for sale securities (1,455,249) (2,856,135) (1,819,814)
Principal collected on mortgage-backed securities 756,092 1,612,679 2,058,626
Net (increase) decrease in loans (228,340) 309,575 (647,213)
Purchases of other investments (79,669) (61,783) (44,447)
Distributions from other investments 8,886 63,356 64,860
Purchases of bank premises and equipment (19,213) (10,390) (6,725)
Proceeds from sales of bank premises and equipment 13,496 11,446 904
Proceeds from sales of other real estate owned 8,969 8,273 6,679
Net cash used in investing activities (992,028) (915,889) (343,705)
Financing activities:      
Net increase in non-interest-bearing demand deposits 7,529 1,122,712 1,169,909
Net increase in savings and interest-bearing demand deposits 155,220 738,043 584,676
Net (decrease) increase in time deposits (120,619) 35,262 141,241
Net (decrease) increase in securities sold under repurchase agreements (8,481) 11,524 191,612
Net decrease in other borrowed funds (425,194) (189) (190,184)
Purchase of treasury stock (52,048) (716) (48,878)
Proceeds from stock transactions 1,537 2,414 542
Payments of cash dividends (75,375) (72,838) (69,928)
Net cash (used in) provided by financing activities (517,431) 1,836,212 1,778,990
(Decrease) increase in cash and cash equivalents (1,121,518) 1,212,004 1,740,418
Cash and cash equivalents at beginning of period 3,209,242 1,997,238 256,820
Cash and cash equivalents at end of period 2,087,724 3,209,242 1,997,238
Supplemental cash flow information:      
Interest paid 36,355 29,007 41,975
Income taxes paid 22,118 47,394 34,826
Non-cash investing and financing activities:      
Purchases of available-for-sale securities not yet settled 80,000    
Net transfers from loans to other real estate owned 835 $ 16,388 4,526
Net transfers from bank premises and equipment to other assets $ 2,476   $ 4,260