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Parent Company Financial Information- Cash flow (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Net Cash Provided by (Used in) Operating Activities [Abstract]      
Net Income $ 176,691 $ 132,217 $ 142,943
Adjustments to reconcile net income to net cash provided by operating activities:      
Net tax benefits from stock compensation 1,097 118 (48)
Securities premium amortization (discount accretion), net 4,031 8,196 5,186
Depreciation and amortization 5,874 4,696 6,174
Increase (decrease) in other assets 1,358 (28,626) (21,421)
Increase (decrease) in other liabilities 24,823 9,826 19,809
Net cash provided by (used in) operating activities 239,534 133,139 132,684
Cash Flows From Investing Activities:      
Purchases of available-for-sale investment securities (2,029,434) (739,955) (374,648)
Proceeds from maturities of available-for-sale securities 313,921 302,471 214,204
Net cash (used in) provided by investing activities (857,922) (557,676) (637,127)
Cash Flows From Financing Activities:      
Repayment of long-term borrowings (200,000) 0 0
Proceeds from exercise of stock options 0 63 332
Proceeds from employee stock purchase plan 496 760 782
Common stock repurchased 682 61,432 54,903
Cash dividends paid 44,691 28,330 22,332
Net cash (used in) provided by financing activities 543,555 1,971,619 424,552
Net (Decrease) Increase In Cash and Cash Equivalents (74,833) 1,547,082 (79,891)
Cash and Cash Equivalents at Beginning of Period 1,789,055 241,973 321,864
Cash and Cash Equivalents at End of Period 1,714,222 1,789,055 241,973
Parent Company      
Net Cash Provided by (Used in) Operating Activities [Abstract]      
Net Income 176,691 132,217 142,943
Adjustments to reconcile net income to net cash provided by operating activities:      
Equity in undistributed income of subsidiary (17,449) (6,191) (70,396)
Net tax benefits from stock compensation 7,811 118 10
Securities premium amortization (discount accretion), net 5 6 2
Depreciation and amortization 0 390 0
Increase (decrease) in other assets 66,598 (48,966) (21,447)
Increase (decrease) in other liabilities (681) 6,823 2,460
Net cash provided by (used in) operating activities 232,975 84,397 53,572
Cash Flows From Investing Activities:      
Purchases of available-for-sale investment securities (40,000) (10,000) (7,030)
Proceeds from maturities of available-for-sale securities 13,031 613 0
Investment in subsidiary (net) 0 0 0
Net cash (used in) provided by investing activities (26,969) (9,387) (7,030)
Cash Flows From Financing Activities:      
Repayment of long-term borrowings (148,407) 0 0
Proceeds from exercise of stock options 0 63 332
Proceeds from employee stock purchase plan 496 760 782
Common stock repurchased (682) (61,432) (54,903)
Cash dividends paid (44,691) (28,330) (22,332)
Net cash (used in) provided by financing activities (193,284) (88,939) (76,121)
Net (Decrease) Increase In Cash and Cash Equivalents 12,722 (13,929) (29,579)
Cash and Cash Equivalents at Beginning of Period 29,275 43,204 72,783
Cash and Cash Equivalents at End of Period $ 41,997 $ 29,275 $ 43,204