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Securities Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Schedule of Held-to-maturity Securities [Line Items]    
Amortized cost $ 3,008,064 $ 3,080,658
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 6,716 2,268
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss 239,596 337,980
Fair Value 2,775,184 2,744,946
Allowance for credit losses - securities held-to-maturity (1,707) (1,608)
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss 3,006,357  
Securities held-to-maturity, net of allowance for credit losses 3,006,357 3,079,050
Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Net [Abstract]    
Due in one year or less 44,911  
Due in one year to five years 406,769  
Due in five to ten years 100,801  
Due after ten years 1,875,065  
Mortgage-backed securities 382,100  
Asset-backed securities 198,418  
Amortized cost 3,008,064 3,080,658
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]    
Due in one year or less 43,530  
Due in one year to five years 383,312  
Due in five to ten years 94,025  
Due after ten years 1,722,290  
Mortgage-backed securities 347,837  
Asset-backed securities 184,190  
Fair Value 2,775,184 2,744,946
Amortized Cost 4,548,772 3,871,491
Gross Unrealized Gain 26,982 12,805
Gross Unrealized Loss 258,224 325,426
Securities available-for-sale, at fair value 4,317,530 3,558,870
US Treasury Securities    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized cost 90,309 92,738
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss 3,840 6,472
Fair Value 86,469 86,266
Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Net [Abstract]    
Amortized cost 90,309 92,738
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]    
Fair Value 86,469 86,266
Amortized Cost 907,990 196,151
Gross Unrealized Gain 2 0
Gross Unrealized Loss 14,580 1,967
Securities available-for-sale, at fair value 893,412 194,184
U.S. Government Agency Securities    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized cost 364,769 374,255
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss 19,187 27,860
Fair Value 345,582 346,395
Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Net [Abstract]    
Amortized cost 364,769 374,255
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]    
Fair Value 345,582 346,395
Amortized Cost 284,607 432,475
Gross Unrealized Gain 0 0
Gross Unrealized Loss 21,877 36,318
Securities available-for-sale, at fair value 262,730 396,157
Mortgage-backed Agency Securities    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized cost 382,100 413,119
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 637 52
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss 34,900 41,593
Fair Value 347,837 371,578
Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Net [Abstract]    
Amortized cost 382,100 413,119
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]    
Fair Value 347,837 371,578
Amortized Cost 1,071,963 1,114,948
Gross Unrealized Gain 444 211
Gross Unrealized Loss 125,017 143,583
Securities available-for-sale, at fair value 947,390 971,576
State and Municipal Securities    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized cost 1,886,459 1,927,778
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 6,079 2,216
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss 159,027 233,564
Fair Value 1,733,511 1,696,430
Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Net [Abstract]    
Amortized cost 1,886,459 1,927,778
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]    
Fair Value 1,733,511 1,696,430
Amortized Cost 1,604,874 1,478,310
Gross Unrealized Gain 26,129 12,553
Gross Unrealized Loss 45,108 78,557
Securities available-for-sale, at fair value 1,585,895 1,412,306
Asset-backed Securities    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized cost 198,418 184,241
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss 14,228 18,573
Fair Value 184,190 165,668
Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Net [Abstract]    
Amortized cost 198,418 184,241
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]    
Fair Value 184,190 165,668
Amortized Cost 201,577 134,386
Gross Unrealized Gain 338 0
Gross Unrealized Loss 10,280 16,983
Securities available-for-sale, at fair value 191,635 117,403
Corporate Debt Securities    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized cost 86,009 88,527
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss 8,414 9,918
Fair Value 77,595 78,609
Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Net [Abstract]    
Amortized cost 86,009 88,527
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]    
Fair Value 77,595 78,609
Amortized Cost 477,761 515,221
Gross Unrealized Gain 69 41
Gross Unrealized Loss 41,362 48,018
Securities available-for-sale, at fair value $ 436,468 $ 467,244