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Parent Company Financial Information - Schedule of Condensed Cash Flow Statement for Parent Company Only (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Net Cash Provided by (Used in) Operating Activities [Abstract]      
Net Income $ 100,534 $ 140,930 $ 176,691
Adjustments to reconcile net income to net cash provided by operating activities:      
Securities premium amortization, net 6,189 9,011 4,031
Provision for (reversal of) credit losses 31,536 266 (20,821)
Depreciation and amortization 3,480 3,319 5,874
(Increase) decrease in other assets (14,976) (26,162) 1,358
(Decrease) increase in other liabilities 58,395 12,581 24,823
Net cash provided by operating activities 195,626 194,902 238,437
Cash Flows From Investing Activities:      
Purchases of available-for-sale investment securities 0 (425,263) (2,029,434)
Proceeds from maturities of available-for-sale securities 123,782 261,999 313,921
Purchase of held-to-maturity investment securities 0 (290,740) 0
Proceeds from maturities from held-to-maturity investment securities 78,251 115,777 0
Net cash used in by investing activities (97,699) (927,077) (857,922)
Cash Flows From Financing Activities:      
Proceeds from exercise of stock options 0 97 0
Proceeds from employee stock purchase plan 586 748 496
Common stock repurchased (48,033) (33,087) (682)
Cash dividends paid (54,993) (55,776) (44,691)
Net cash used in financing activities 312,903 (670,193) 544,652
Net Increase (Decrease) in Cash and Cash Equivalents 410,830 (1,402,368) (74,833)
Cash and Cash Equivalents at Beginning of Period 311,854 1,714,222 1,789,055
Cash and Cash Equivalents at End of Period 722,684 311,854 1,714,222
Non-Cash Investing Activities      
Transfers of investment securities from available-for-sale to held-to-maturity 0 922,975 0
Parent Company      
Net Cash Provided by (Used in) Operating Activities [Abstract]      
Net Income 100,534 140,930 176,691
Adjustments to reconcile net income to net cash provided by operating activities:      
Adjustments to reconcile net income to net cash used in operating activities: Equity in undistributed income of subsidiary 18,549 (72,748) (17,449)
Net tax benefits from stock based compensation expense 10,018 9,899 7,811
Securities premium amortization, net 6 (54) 5
Provision for (reversal of) credit losses 1,124 326 0
Depreciation and amortization 124 0 0
(Increase) decrease in other assets (10,397) (12,909) 66,598
(Decrease) increase in other liabilities (1,064) 4,593 (681)
Net cash provided by operating activities 118,894 70,037 232,975
Cash Flows From Investing Activities:      
Purchases of available-for-sale investment securities 0 0 (40,000)
Proceeds from maturities of available-for-sale securities 0 0 13,031
Purchase of held-to-maturity investment securities 0 (3,976) 0
Proceeds from maturities from held-to-maturity investment securities 0 1,500 0
Net cash used in by investing activities 0 (2,476) (26,969)
Cash Flows From Financing Activities:      
Repayment of long-term borrowings 0 0 (148,407)
Proceeds from exercise of stock options 0 97 0
Proceeds from employee stock purchase plan 586 748 496
Common stock repurchased (47,631) (33,087) (682)
Cash dividends paid (54,993) (55,776) (44,691)
Net cash used in financing activities (102,038) (88,018) (193,284)
Net Increase (Decrease) in Cash and Cash Equivalents 16,856 (20,457) 12,722
Cash and Cash Equivalents at Beginning of Period 21,540 41,997 29,275
Cash and Cash Equivalents at End of Period 38,396 21,540 41,997
Non-Cash Investing Activities      
Transfers of investment securities from available-for-sale to held-to-maturity $ 0 $ 42,467 $ 0