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Securities Available for Sale and Held to Maturity - Amortized Cost and Estimated Fair Value of Available for Sale and Held to Maturity Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Schedule of Available For Sale and Held to Maturity Securities [Line Items]    
Securities Available for Sale, Amortized Cost $ 2,200,255 $ 2,270,709
Securities Available for Sale, Gross Unrealized Gains 134 380
Securities Available for Sale, Gross Unrealized (Losses) (216,227) (247,007)
Debt Securities, Available-for-sale 1,984,162 2,024,082
Securities Held to Maturity, Amortized Cost 1,474,338 1,494,514
Securities Held to Maturity, Gross Unrealized Gains 1,690 37
Securities Held to Maturity, Gross Unrealized (Losses) (69,623) (87,962)
Securities Held to Maturity, Estimated Fair Value 1,406,405 1,406,589
U.S. Treasury Securities [Member]    
Schedule of Available For Sale and Held to Maturity Securities [Line Items]    
Securities Available for Sale, Amortized Cost 415,842 425,719
Securities Available for Sale, Gross Unrealized Gains 0 308
Securities Available for Sale, Gross Unrealized (Losses) (28,939) (34,514)
Debt Securities, Available-for-sale 386,903 391,513
Securities Held to Maturity, Amortized Cost 28,486 28,295
Securities Held to Maturity, Gross Unrealized Gains 361 0
Securities Held to Maturity, Gross Unrealized (Losses) 0 (115)
Securities Held to Maturity, Estimated Fair Value 28,847 28,180
U.S. Government Agency Obligations [Member]    
Schedule of Available For Sale and Held to Maturity Securities [Line Items]    
Securities Available for Sale, Amortized Cost 7,745 8,297
Securities Available for Sale, Gross Unrealized Gains 0 0
Securities Available for Sale, Gross Unrealized (Losses) (491) (531)
Debt Securities, Available-for-sale 7,254 7,766
Securities Held to Maturity, Amortized Cost 0 0
Securities Held to Maturity, Gross Unrealized Gains 0 0
Securities Held to Maturity, Gross Unrealized (Losses) 0 0
Securities Held to Maturity, Estimated Fair Value 0 0
Obligations of States and Political Subdivisions [Member]    
Schedule of Available For Sale and Held to Maturity Securities [Line Items]    
Securities Available for Sale, Amortized Cost 4,804 4,820
Securities Available for Sale, Gross Unrealized Gains 110 53
Securities Available for Sale, Gross Unrealized (Losses) (7) (11)
Debt Securities, Available-for-sale 4,907 4,862
Securities Held to Maturity, Amortized Cost 4,507 4,510
Securities Held to Maturity, Gross Unrealized Gains 3 3
Securities Held to Maturity, Gross Unrealized (Losses) 0 (3)
Securities Held to Maturity, Estimated Fair Value 4,510 4,510
Residential Mortgage Pass-Through Securities Guaranteed by GNMA [Member]    
Schedule of Available For Sale and Held to Maturity Securities [Line Items]    
Securities Available for Sale, Amortized Cost 29,737 30,534
Securities Available for Sale, Gross Unrealized Gains 9 7
Securities Available for Sale, Gross Unrealized (Losses) (2,895) (3,444)
Debt Securities, Available-for-sale 26,851 27,097
Securities Held to Maturity, Amortized Cost 4,336 4,442
Securities Held to Maturity, Gross Unrealized Gains 1 0
Securities Held to Maturity, Gross Unrealized (Losses) (312) (395)
Securities Held to Maturity, Estimated Fair Value 4,025 4,047
Residential Mortgage Pass-Through Securities Issued by FNMA and FHLMC [Member]    
Schedule of Available For Sale and Held to Maturity Securities [Line Items]    
Securities Available for Sale, Amortized Cost 1,492,724 1,541,570
Securities Available for Sale, Gross Unrealized Gains 15 12
Securities Available for Sale, Gross Unrealized (Losses) (174,891) (196,119)
Debt Securities, Available-for-sale 1,317,848 1,345,463
Securities Held to Maturity, Amortized Cost 497,854 509,311
Securities Held to Maturity, Gross Unrealized Gains 1,250 0
Securities Held to Maturity, Gross Unrealized (Losses) (15,875) (19,586)
Securities Held to Maturity, Estimated Fair Value 483,229 489,725
Other Residential Mortgage-Backed Securities Issued or Guaranteed by FNMA, FHLMC or GNMA [Member]    
Schedule of Available For Sale and Held to Maturity Securities [Line Items]    
Securities Available for Sale, Amortized Cost 115,332 123,755
Securities Available for Sale, Gross Unrealized Gains 0 0
Securities Available for Sale, Gross Unrealized (Losses) (7,140) (8,615)
Debt Securities, Available-for-sale 108,192 115,140
Securities Held to Maturity, Amortized Cost 179,334 188,201
Securities Held to Maturity, Gross Unrealized Gains 0 0
Securities Held to Maturity, Gross Unrealized (Losses) (11,132) (13,826)
Securities Held to Maturity, Estimated Fair Value 168,202 174,375
Commercial Mortgage-Backed Securities Issued or Guaranteed by FNMA, FHLMC or GNMA [Member]    
Schedule of Available For Sale and Held to Maturity Securities [Line Items]    
Securities Available for Sale, Amortized Cost 134,071 136,014
Securities Available for Sale, Gross Unrealized Gains 0 0
Securities Available for Sale, Gross Unrealized (Losses) (1,864) (3,773)
Debt Securities, Available-for-sale 132,207 132,241
Securities Held to Maturity, Amortized Cost 759,821 759,755
Securities Held to Maturity, Gross Unrealized Gains 75 34
Securities Held to Maturity, Gross Unrealized (Losses) (42,304) (54,037)
Securities Held to Maturity, Estimated Fair Value $ 717,592 $ 705,752