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Securities, Held to Maturity (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Held-to-maturity securities, fair value to amortized cost [Abstract]      
Amortized cost $ 919,517 $ 733,210  
Unrealized gains 209 10,040  
Unrealized losses (107,079) (7,990)  
Estimated fair value 812,647 735,260  
Allowance for credit losses on HTM securities 0 0  
Transactions of HTM securities [Abstract]      
Gains from calls on HTM securities 4 29 $ 24
Held-to-maturity securities sold, amortized cost 0 0 1,000
Held-to-maturity securities sold, realized loss     $ 1
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 (20,678) (4,365)  
Estimated fair value 79,322 95,635  
Mortgage-backed Securities, Government-Sponsored Enterprises [Member]      
Held-to-maturity securities, fair value to amortized cost [Abstract]      
Amortized cost 249,511 161,462  
Unrealized gains 0 2,232  
Unrealized losses (36,819) (1,319)  
Estimated fair value 212,692 162,375  
Mortgage-Backed, U.S. Government Agency Securities [Member]      
Held-to-maturity securities, fair value to amortized cost [Abstract]      
Amortized cost 18,396 9,112  
Unrealized gains 4 514  
Unrealized losses (619) 0  
Estimated fair value 17,781 9,626  
Collateralized Mortgage Obligations, Government-Sponsored Enterprises [Member]      
Held-to-maturity securities, fair value to amortized cost [Abstract]      
Amortized cost 207,738 94,342  
Unrealized gains 200 1,932  
Unrealized losses (14,876) (129)  
Estimated fair value 193,062 96,145  
Collateralized Mortgage Obligations, U.S. Government Agency Securities [Member]      
Held-to-maturity securities, fair value to amortized cost [Abstract]      
Amortized cost 66,628 44,473  
Unrealized gains 0 336  
Unrealized losses (9,842) (674)  
Estimated fair value 56,786 44,135  
State & Municipal [Member]      
Held-to-maturity securities, fair value to amortized cost [Abstract]      
Amortized cost 277,244 323,821  
Unrealized gains 5 5,026  
Unrealized losses (24,245) (1,503)  
Estimated fair value 253,004 327,344  
Public Deposits and Other Purposes [Member]      
Securities pledged [Abstract]      
AFS and HTM securities 1,730,000 1,630,000  
Securities Sold under Repurchase Agreements [Member]      
Securities pledged [Abstract]      
AFS and HTM securities $ 149,500 $ 162,100