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Securities - Schedule of Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Schedule of Available-for-sale Securities [Line Items]    
Fair value less than 12 months $ 124,570 $ 880,068
Unrealized losses less than 12 months (7,571) (75,452)
Fair value more than 12 months 2,287,148 1,719,396
Unrealized losses more than 12 months (561,874) (406,840)
Total fair value 2,411,718 2,599,464
Total unrealized losses (569,445) (482,292)
U.S. Treasury and federal agencies    
Schedule of Available-for-sale Securities [Line Items]    
Fair value less than 12 months 1,322 217,357
Unrealized losses less than 12 months (12) (16,692)
Fair value more than 12 months 498,536 295,585
Unrealized losses more than 12 months (81,476) (59,695)
Total fair value 499,858 512,942
Total unrealized losses (81,488) (76,387)
State and municipal    
Schedule of Available-for-sale Securities [Line Items]    
Fair value less than 12 months 123,235 533,871
Unrealized losses less than 12 months (7,558) (45,881)
Fair value more than 12 months 1,066,492 757,061
Unrealized losses more than 12 months (320,865) (218,179)
Total fair value 1,189,727 1,290,932
Total unrealized losses (328,423) (264,060)
Federal agency collateralized mortgage obligations    
Schedule of Available-for-sale Securities [Line Items]    
Fair value less than 12 months 0 40,301
Unrealized losses less than 12 months 0 (2,881)
Fair value more than 12 months 63,990 38,613
Unrealized losses more than 12 months (11,793) (7,780)
Total fair value 63,990 78,914
Total unrealized losses (11,793) (10,661)
Federal agency mortgage-backed pools    
Schedule of Available-for-sale Securities [Line Items]    
Fair value less than 12 months 13 49,633
Unrealized losses less than 12 months (1) (3,211)
Fair value more than 12 months 429,933 428,243
Unrealized losses more than 12 months (99,191) (83,810)
Total fair value 429,946 477,876
Total unrealized losses (99,192) (87,021)
Private labeled mortgage-backed pools    
Schedule of Available-for-sale Securities [Line Items]    
Fair value less than 12 months 0 0
Unrealized losses less than 12 months 0 0
Fair value more than 12 months 27,298 29,973
Unrealized losses more than 12 months (5,694) (5,493)
Total fair value 27,298 29,973
Total unrealized losses (5,694) (5,493)
Corporate notes    
Schedule of Available-for-sale Securities [Line Items]    
Fair value less than 12 months 0 38,906
Unrealized losses less than 12 months 0 (6,787)
Fair value more than 12 months 200,899 169,921
Unrealized losses more than 12 months (42,855) (31,883)
Total fair value 200,899 208,827
Total unrealized losses $ (42,855) $ (38,670)