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Condensed Financial Information (Parent Company Only) - Condensed Statements of Cash Flows (Details) - USD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Operating Activities      
Net income $ 279,234,000 $ 219,721,000 $ 227,104,000
Net cash provided by operating activities (356,402,000) 975,774,000 (49,216,000)
Investing Activities      
Purchase of limited partnership interests or LLC's (18,762,000) (14,590,000) (11,194,000)
Other investing activity 1,937,000 4,395,000 404,000
Net cash used in investing activities (3,260,081,000) (2,862,851,000) (474,262,000)
Financing Activities      
Dividends paid (48,506,000) (38,067,000) (31,235,000)
Proceeds from issuance of preferred stock   137,459,000 191,084,000
Repurchase of preferred stock     (41,625,000)
Repurchase of common stock   (3,935,333)  
Net cash provided by financing activities 3,974,741,000 1,080,627,000 1,376,364,000
Net Change in Cash and Due From Banks 358,258,000 (806,450,000) 852,886,000
Reportable Legal Entities | Company      
Operating Activities      
Net income 279,234,000 219,721,000 227,104,000
Adjustments to reconcile net income to net cash used in operating activities (229,428,000) (181,263,000) (195,530,000)
Net cash provided by operating activities 49,806,000 38,458,000 31,574,000
Investing Activities      
Contributed capital to subsidiaries (43,922,000) (110,000,000) (116,176,000)
Purchase of limited partnership interests or LLC's (769,000) (8,746,000) (15,223,000)
Other investing activity 554,000    
Net cash used in investing activities (44,137,000) (118,746,000) (131,399,000)
Financing Activities      
Net change in lines of credit and subordinated debt 43,922,000 4,000,000 2,040,000
Dividends paid (48,506,000) (38,067,000) (31,235,000)
Proceeds from issuance of preferred stock   137,459,000 191,084,000
Redemption of preferred stock     (41,625,000)
Repurchase of common stock   (3,935,000)  
Net cash provided by financing activities (4,584,000) 99,457,000 120,264,000
Net Change in Cash and Due From Banks 1,085,000 19,169,000 20,439,000
Cash and Cash Equivalents, Beginning of Period 41,725,000 22,556,000 2,117,000
Cash and Cash Equivalents, End of Period 42,810,000 41,725,000 22,556,000
Additional Cash Flows Information:      
Payable for limited partnership interest or LLC's $ 2,752,000 $ 3,521,000 $ 10,350,000