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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Cash Flows From Operating Activities      
Net income $ 226,409 $ 238,206 $ 190,830
Adjustments to reconcile net income to cash provided by operating activities:      
Depreciation 28,911 26,719 23,773
Amortization of other intangible assets 14,091 16,911 14,442
Amortization of tax credit investments 18,788 2,749 22,949
Net premium amortization on investment securities 18,798 19,210 14,384
Accretion income related to acquired loans (23,331) (42,772) (40,598)
Share-based compensation expense 7,707 7,993 8,118
Excess tax (benefit) expense on share-based compensation     401
Excess tax (benefit) expense on share-based compensation (766) (1,069)  
Provision for loan losses [1] 38,395 4,747 6,966
Debt securities (gains) losses, net (10,767) (1,923) (2,060)
Net gain on banking center divestitures 0 0 (13,989)
Net (gains) losses on sales of loans and other assets (23,787) (7,370) (2,290)
Increase in cash surrender value of company-owned life insurance (12,031) (11,539) (10,584)
Residential real estate loans originated for sale (1,432,488) (854,848) (501,999)
Proceeds from sales of residential real estate loans 1,455,067 834,024 514,891
(Increase) decrease in interest receivable (183) 4,340 2,038
(Increase) decrease in other assets (105,203) 23,322 8,578
Increase (decrease) in accrued expenses and other liabilities 20,210 (24,944) (1,443)
Net cash flows provided by (used in) operating activities 219,820 233,756 234,407
Cash Flows From Investing Activities      
Cash received (paid) from acquisitions, net 0 0 60,759
Payments related to banking center divestitures 0 0 (210,659)
Purchases of investment securities available-for-sale (2,803,406) (2,366,089) (663,338)
Purchases of Federal Home Loan Bank/Federal Reserve Bank stock (10,025) (21,142) (23,066)
Proceeds from maturities, prepayments, and calls of investment securities    available-for-sale 1,990,383 1,175,272 419,270
Proceeds from sales of investment securities available-for-sale 299,885 424,140 139,364
Proceeds from maturities, prepayments, and calls of investment securities held-to-maturity 0 115,648 55,520
Proceeds from sales of investment securities held-to-maturity 0 9,921 0
Proceeds from sales of Federal Home Loan Bank/Federal Reserve Bank stock 4,691 23 2,409
Proceeds from sales of equity securities 39,296 130 128
Proceeds from sale of student loan portfolio 0 0 70,674
Loan originations and payments, net (1,644,119) 163,551 (102,928)
Proceeds from company-owned life insurance death benefits 4,888 6,796 6,501
Proceeds from sale of premises and equipment and other assets 7,826 3,769 7,341
Purchases of premises and equipment and other assets (30,871) (37,423) (33,391)
Net cash flows provided by (used in) investing activities (2,141,452) (525,404) (271,416)
Net increase (decrease) in:      
Deposits 2,484,056 203,448 261,551
Federal funds purchased and interbank borrowings (349,248) 80,279 (64,898)
Securities sold under agreements to repurchase 103,384 (34,512) (41,997)
Other borrowings 4,171 (4,377) (1,505)
Payments for maturities of Federal Home Loan Bank advances (751,505) (377,978) (1,001,888)
Payments for modification of Federal Home Loan Bank advances (31,124) 0 0
Proceeds from Federal Home Loan Bank advances 950,000 575,000 995,000
Cash dividends paid on common stock (92,946) (89,474) (82,161)
Common stock repurchased (82,358) (102,413) (1,805)
Proceeds from exercise of stock options 0 280 948
Common stock issued 577 567 497
Net cash flows provided by (used in) financing activities 2,235,007 250,820 63,742
Net increase (decrease) in cash and cash equivalents 313,375 (40,828) 26,733
Cash and cash equivalents at beginning of period 276,337 317,165 290,432
Cash and cash equivalents at end of period $ 589,712 $ 276,337 $ 317,165
[1] Beginning January 1, 2020, calculation is based on current expected loss methodology. Prior to January 1, 2020, calculation was based on incurred loss methodology.