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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Operating activities:      
Net income $ 167,319 $ 205,104 $ 215,931
Adjustments to reconcile net income to net cash provided by operating activities:      
Provision for credit loss 45,379 18,843 6,112
Specific reserve, other real estate owned 1,539 322 3,071
Depreciation of bank premises and equipment 28,318 28,270 25,873
Gain on sale of bank premises and equipment (40) (237) (1,456)
Gain on sale of other real estate owned (892) (1,470) (1,465)
Accretion of investment securities discounts (500) (428) (271)
Amortization of investment securities premiums 39,039 20,549 20,087
Investment securities transactions, net 5 12 141
Unrealized gain (loss) on equity securities with readily determinable fair values (107) (158) 388
Stock based compensation expense 743 980 1,035
Losses (earnings) from affiliates and other investments 74 (3,914) (15,484)
Deferred income taxes (3,122) 3,309 5,143
(Increase) decrease in accrued interest receivable (1,261) 183 (2,347)
Decrease (increase) in other assets 42,571 8,043 (51,827)
(Decrease) increase in other liabilities (13,932) 32,157 24,916
Net cash provided by operating activities 305,133 311,565 229,847
Investing activities:      
Proceeds from maturities of securities 1,075   2,275
Proceeds from sales and calls of available for sale securities 42,350 94,585 38,175
Proceeds from sales of equity securities with readily determinable fair values     21,607
Purchases of available for sale securities (1,819,814) (893,301) (47,346)
Principal collected on mortgage backed securities 2,058,626 882,479 675,304
Net increase in loans (647,213) (375,621) (258,142)
Purchases of other investments (44,447) (52,795) (43,418)
Distributions from other investments 64,860 44,919 3,668
Purchases of bank premises and equipment (6,725) (29,590) (21,395)
Proceeds from sales of bank premises and equipment 904 1,861 4,533
Proceeds from sales of other real estate owned 6,679 9,405 4,179
Net cash (used in) provided by investing activities (343,705) (318,058) 379,440
Financing activities:      
Net increase in non-interest bearing demand deposits 1,169,909 91,065 211,585
Net increase (decrease) in savings and interest bearing demand deposits 584,676 (408) 23,106
Net increase (decrease) in time deposits 141,241 38,832 (83,038)
Net increase (decrease) in securities sold under repurchase agreements 191,612 6,547 (123,816)
Net decrease in other borrowed funds (190,184) (79,154) (489,560)
Redemption of long-term debt   (25,774)  
Repurchase of outstanding common stock warrant     (29,005)
Purchase of treasury stock (48,878) (17,845) (19,042)
Proceeds from stock transactions 542 1,923 1,522
Payments of cash dividends - common (69,928) (68,670) (49,599)
Net cash used in financing activities 1,778,990 (53,484) (557,847)
Increase (decrease) in cash and cash equivalents 1,740,418 (59,977) 51,440
Cash and cash equivalents at beginning of period 256,820 316,797 265,357
Cash and cash equivalents at end of period 1,997,238 256,820 316,797
Supplemental cash flow information:      
Interest paid 41,975 56,728 50,623
Income taxes paid 34,826 44,089 40,565
Non-cash investing and financing activities:      
Net transfers from loans to other real estate owned 4,526 22,015 $ 32,610
Establishment of lease liability and right-of-use asset   $ 6,171  
Net transfers from bank premises and equipment to other assets $ 4,260