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Investment Securities - Summary of Carrying Amounts of Securities and Their Approximate Fair Values (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Schedule of Available for Sale Securities and Held to Maturity Securities [Line Items]    
Available for sale securities, Amortized Cost $ 178,186 $ 182,027
Available for sale securities, Gross Unrealized Gains 6 7
Available for sale securities, Gross Unrealized Losses (26,009) (28,618)
Total available for sale securities 152,183 153,416
Held to maturity securities, Amortized Cost 1,030,858 1,051,997
Held to maturity securities, Gross Unrealized Gains 137 92
Held to maturity securities, Gross Unrealized Losses (151,672) (166,503)
Held-to-maturity securities, fair value 879,323 885,586
Total, Amortized Cost 1,209,044 1,234,024
Total, Gross Unrealized Gains 143 99
Total, Gross Unrealized Losses (177,681) (195,121)
Total, Fair Value 1,031,506 1,039,002
U.S. Government Sponsored Enterprise Obligations    
Schedule of Available for Sale Securities and Held to Maturity Securities [Line Items]    
Available for sale securities, Amortized Cost 22,997 22,997
Available for sale securities, Gross Unrealized Losses (2,959) (3,264)
Total available for sale securities 20,038 19,733
U.S. Treasury Notes    
Schedule of Available for Sale Securities and Held to Maturity Securities [Line Items]    
Held to maturity securities, Amortized Cost 3,988 3,970
Held to maturity securities, Gross Unrealized Gains 8
Held to maturity securities, Gross Unrealized Losses (9) (18)
Held-to-maturity securities, fair value 3,987 3,952
Corporate Debt Securities    
Schedule of Available for Sale Securities and Held to Maturity Securities [Line Items]    
Available for sale securities, Amortized Cost 999 996
Available for sale securities, Gross Unrealized Gains 1 4
Total available for sale securities 1,000 1,000
Held to maturity securities, Amortized Cost 250 250
Held to maturity securities, Gross Unrealized Losses (6) (6)
Held-to-maturity securities, fair value 244 244
Mortgage Backed Securities    
Schedule of Available for Sale Securities and Held to Maturity Securities [Line Items]    
Available for sale securities, Amortized Cost 154,190 158,034
Available for sale securities, Gross Unrealized Gains 5 3
Available for sale securities, Gross Unrealized Losses (23,050) (25,354)
Total available for sale securities [1] 131,145 132,683
Held to maturity securities, Amortized Cost [1] 932,451 951,372
Held to maturity securities, Gross Unrealized Gains 2 4
Held to maturity securities, Gross Unrealized Losses (143,633) (157,208)
Held-to-maturity securities, fair value 788,820 794,168
Municipal Securities    
Schedule of Available for Sale Securities and Held to Maturity Securities [Line Items]    
Held to maturity securities, Amortized Cost 94,169 96,405
Held to maturity securities, Gross Unrealized Gains 127 88
Held to maturity securities, Gross Unrealized Losses (8,024) (9,271)
Held-to-maturity securities, fair value $ 86,272 $ 87,222
[1] Includes agency mortgage-backed pass-through securities and collateralized mortgage obligations issued by U.S. Government Sponsored Enterprises (“GSEs”) and U.S. government agencies, such as FNMA, FHLMC, and GNMA that are not rated by Moody’s or Standard & Poor's. Each security contains a guarantee by the issuing U.S. GSE or agency and therefore carries an implicit guarantee of the U.S. government. These have been categorized as AAA/AA/A.