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Securities Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Schedule of Held-to-maturity Securities [Line Items]    
Amortized cost $ 2,800,606 $ 3,008,064
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 2,003 6,716
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss 242,357 239,596
Fair Value 2,560,252 2,775,184
Allowance for credit losses - securities held-to-maturity (1,707) (1,707)
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss 2,798,899  
Securities held-to-maturity, net of allowance for credit losses 2,798,899 3,006,357
Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Net [Abstract]    
Due in one year or less 72,584  
Due in one year to five years 297,748  
Due in five to ten years 80,411  
Due after ten years 1,821,877  
Mortgage-backed securities 366,029  
Asset-backed securities 161,957  
Amortized cost 2,800,606 3,008,064
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]    
Due in one year or less 71,774  
Due in one year to five years 280,994  
Due in five to ten years 73,611  
Due after ten years 1,647,333  
Mortgage-backed securities 331,462  
Asset-backed securities 155,078  
Fair Value 2,560,252 2,775,184
Amortized Cost 5,787,403 4,548,772
Gross Unrealized Gain 16,580 26,982
Gross Unrealized Loss 221,614 258,224
Securities available-for-sale, at fair value 5,582,369 4,317,530
US Treasury Securities    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized cost 19,841 90,309
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss 954 3,840
Fair Value 18,887 86,469
Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Net [Abstract]    
Amortized cost 19,841 90,309
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]    
Fair Value 18,887 86,469
Amortized Cost 1,419,727 907,990
Gross Unrealized Gain 28 2
Gross Unrealized Loss 14,277 14,580
Securities available-for-sale, at fair value 1,405,478 893,412
U.S. Government Agency Securities    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized cost 315,286 364,769
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss 13,719 19,187
Fair Value 301,567 345,582
Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Net [Abstract]    
Amortized cost 315,286 364,769
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]    
Fair Value 301,567 345,582
Amortized Cost 238,636 284,607
Gross Unrealized Gain 2 0
Gross Unrealized Loss 24,572 21,877
Securities available-for-sale, at fair value 214,066 262,730
Mortgage-backed Agency Securities    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized cost 366,029 382,100
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 6 637
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss 34,573 34,900
Fair Value 331,462 347,837
Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Net [Abstract]    
Amortized cost 366,029 382,100
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]    
Fair Value 331,462 347,837
Amortized Cost 2,068,950 1,071,963
Gross Unrealized Gain 976 444
Gross Unrealized Loss 107,567 125,017
Securities available-for-sale, at fair value 1,962,359 947,390
State and Municipal Securities    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized cost 1,854,942 1,886,459
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 1,956 6,079
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss 178,744 159,027
Fair Value 1,678,154 1,733,511
Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Net [Abstract]    
Amortized cost 1,854,942 1,886,459
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]    
Fair Value 1,678,154 1,733,511
Amortized Cost 1,537,910 1,604,874
Gross Unrealized Gain 15,382 26,129
Gross Unrealized Loss 46,735 45,108
Securities available-for-sale, at fair value 1,506,557 1,585,895
Asset-backed Securities    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized cost 161,957 198,418
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 41 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss 6,920 14,228
Fair Value 155,078 184,190
Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Net [Abstract]    
Amortized cost 161,957 198,418
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]    
Fair Value 155,078 184,190
Amortized Cost 45,280 201,577
Gross Unrealized Gain 85 338
Gross Unrealized Loss 27 10,280
Securities available-for-sale, at fair value 45,338 191,635
Corporate Debt Securities    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized cost 82,551 86,009
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss 7,447 8,414
Fair Value 75,104 77,595
Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Net [Abstract]    
Amortized cost 82,551 86,009
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]    
Fair Value 75,104 77,595
Amortized Cost 476,900 477,761
Gross Unrealized Gain 107 69
Gross Unrealized Loss 28,436 41,362
Securities available-for-sale, at fair value $ 448,571 $ 436,468