v3.25.1
Securities, Held to Maturity (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Held-to-maturity securities, fair value to amortized cost [Abstract]      
Amortized cost $ 836,833   $ 842,921
Unrealized gains 60   42
Unrealized losses (80,489)   (93,018)
Estimated fair value 756,404   749,945
Transactions of HTM securities [Abstract]      
Gains from calls on HTM securities 0 $ 0  
Asset Pledged as Collateral [Member] | Public Deposits or Other Purposes [Member]      
Securities pledged [Abstract]      
AFS and HTM securities 1,770,000   1,600,000
Asset Pledged as Collateral [Member] | Securities Sold under Repurchase Agreements [Member]      
Securities pledged [Abstract]      
AFS and HTM securities 223,000   234,200
Federal Agency [Member]      
Held-to-maturity securities, fair value to amortized cost [Abstract]      
Amortized cost 100,000   100,000
Unrealized gains 0   0
Unrealized losses (14,304)   (16,656)
Estimated fair value 85,696   83,344
Mortgage-Backed, Government Sponsored Enterprises [Member]      
Held-to-maturity securities, fair value to amortized cost [Abstract]      
Amortized cost 204,020   208,579
Unrealized gains 0   0
Unrealized losses (29,009)   (34,349)
Estimated fair value 175,011   174,230
Mortgage-Backed, U.S. Government Agency Securities [Member]      
Held-to-maturity securities, fair value to amortized cost [Abstract]      
Amortized cost 14,111   15,611
Unrealized gains 1   1
Unrealized losses (173)   (516)
Estimated fair value 13,939   15,096
Collateralized Mortgage Obligations, Government-Sponsored Enterprises [Member]      
Held-to-maturity securities, fair value to amortized cost [Abstract]      
Amortized cost 163,514   168,018
Unrealized gains 57   0
Unrealized losses (9,610)   (11,554)
Estimated fair value 153,961   156,464
Collateralized Mortgage Obligations, U.S. Government Agency Securities [Member]      
Held-to-maturity securities, fair value to amortized cost [Abstract]      
Amortized cost 60,229   60,906
Unrealized gains 0   0
Unrealized losses (10,327)   (11,245)
Estimated fair value 49,902   49,661
State & Municipal [Member]      
Held-to-maturity securities, fair value to amortized cost [Abstract]      
Amortized cost 294,959   289,807
Unrealized gains 2   41
Unrealized losses (17,066)   (18,698)
Estimated fair value $ 277,895   $ 271,150