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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      
Net income $ 277,538 $ 226,409 $ 238,206
Adjustments to reconcile net income to cash provided by operating activities:      
Depreciation 27,276 28,911 26,719
Amortization of other intangible assets 11,336 14,091 16,911
Amortization of tax credit investments 6,770 18,788 2,749
Net premium amortization on investment securities 16,305 18,798 19,210
Accretion income related to acquired loans (16,747) (23,331) (42,772)
Share-based compensation expense 7,497 7,707 7,993
Provision for credit losses [1] (28,812) 38,395 4,747
Debt securities (gains) losses, net (4,327) (10,767) (1,923)
Net (gains) losses on sales of loans and other assets (36,677) (23,787) (7,370)
Increase in cash surrender value of company-owned life insurance (10,589) (12,031) (11,539)
Residential real estate loans originated for sale (1,215,015) (1,432,488) (854,848)
Proceeds from sales of residential real estate loans 1,274,812 1,455,067 834,024
(Increase) decrease in interest receivable 1,198 (183) 4,340
(Increase) decrease in other assets 2,641 (105,969) 22,253
Increase (decrease) in accrued expenses and other liabilities 17,174 20,210 (24,944)
Net cash flows provided by (used in) operating activities 330,380 219,820 233,756
Cash Flows From Investing Activities      
Purchases of investment securities available-for-sale (3,321,653) (2,803,406) (2,366,089)
Purchases of Federal Home Loan Bank/Federal Reserve Bank stock 0 (10,025) (21,142)
Purchases of equity securities (11,000) 0 0
Proceeds from maturities, prepayments, and calls of investment securities    available-for-sale 1,511,510 1,990,383 1,175,272
Proceeds from sales of investment securities available-for-sale 198,886 299,885 424,140
Proceeds from maturities, prepayments, and calls of investment securities held-to-maturity 0 0 115,648
Proceeds from sales of investment securities held-to-maturity 0 0 9,921
Proceeds from sales of Federal Home Loan Bank/Federal Reserve Bank stock 58 4,691 23
Proceeds from sales of equity securities 544 39,296 130
Loan originations and payments, net 206,145 (1,644,119) 163,551
Proceeds from company-owned life insurance death benefits 3,375 4,888 6,796
Proceeds from sale of premises and equipment and other assets 29,244 7,826 3,769
Purchases of premises and equipment and other assets (48,692) (30,871) (37,423)
Net cash flows provided by (used in) investing activities (1,431,583) (2,141,452) (525,404)
Net increase (decrease) in:      
Deposits 1,531,742 2,484,056 203,448
Federal funds purchased and interbank borrowings (890) (349,248) 80,279
Securities sold under agreements to repurchase (38,891) 103,384 (34,512)
Other borrowings 36,187 4,171 (4,377)
Payments for maturities of Federal Home Loan Bank advances (146,505) (751,505) (377,978)
Payments for modification of Federal Home Loan Bank advances (2,156) (31,124) 0
Proceeds from Federal Home Loan Bank advances 50,000 950,000 575,000
Cash dividends paid on common stock (92,829) (92,946) (89,474)
Common stock repurchased (3,731) (82,358) (102,413)
Proceeds from exercise of stock options 0 0 280
Common stock issued 583 577 567
Net cash flows provided by (used in) financing activities 1,333,510 2,235,007 250,820
Net increase (decrease) in cash and cash equivalents 232,307 313,375 (40,828)
Cash and cash equivalents at beginning of period 589,712 276,337 317,165
Cash and cash equivalents at end of period $ 822,019 $ 589,712 $ 276,337
[1] Beginning January 1, 2020, with the adoption of CECL, calculation is based on current expected credit loss methodology. Prior to January 1, 2020, calculation was based on incurred loss methodology.