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Investment Securities - Summary of Carrying Amounts of Securities and Their Approximate Fair Values (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Schedule of Available for Sale Securities and Held to Maturity Securities [Line Items]    
Available for sale securities, Amortized Cost $ 202,688 $ 201,270
Available for sale securities, Gross Unrealized Gains 53 1,229
Available for sale securities, Gross Unrealized Losses (14,536) (4,696)
Total available for sale securities 188,205 197,803
Held to maturity securities, Amortized Cost 1,115,824 977,061
Held to maturity securities, Gross Unrealized Gains 1,413 7,805
Held to maturity securities, Gross Unrealized Losses (73,846) (13,774)
Held-to-maturity securities, fair value 1,043,391 971,092
Total, Amortized Cost 1,318,512 1,178,331
Total, Gross Unrealized Gains 1,466 9,034
Total, Gross Unrealized Losses (88,382) (18,470)
Total, Fair Value 1,231,596 1,168,895
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 22,996
Available for sale securities, Gross Unrealized Gains   246
Available for sale securities, Gross Unrealized Losses (1,329) (231)
Total available for sale securities 21,668 23,011
Corporate Debt Securities    
Schedule of Available for Sale Securities and Held to Maturity Securities [Line Items]    
Available for sale securities, Amortized Cost 1,743 1,743
Available for sale securities, Gross Unrealized Gains 21 24
Available for sale securities, Gross Unrealized Losses (6) (3)
Total available for sale securities 1,758 1,764
Held to maturity securities, Amortized Cost 2,498 6,997
Held to maturity securities, Gross Unrealized Gains 7 26
Held-to-maturity securities, fair value 2,505 7,023
Mortgage Backed Securities    
Schedule of Available for Sale Securities and Held to Maturity Securities [Line Items]    
Available for sale securities, Amortized Cost 177,948 176,531
Available for sale securities, Gross Unrealized Gains 32 959
Available for sale securities, Gross Unrealized Losses (13,201) (4,462)
Total available for sale securities [1] 164,779 173,028
Held to maturity securities, Amortized Cost [1] 1,009,206 864,983
Held to maturity securities, Gross Unrealized Gains 594 3,981
Held to maturity securities, Gross Unrealized Losses (68,718) (13,258)
Held-to-maturity securities, fair value 941,082 855,706
Municipal Securities    
Schedule of Available for Sale Securities and Held to Maturity Securities [Line Items]    
Held to maturity securities, Amortized Cost 104,120 105,081
Held to maturity securities, Gross Unrealized Gains 812 3,798
Held to maturity securities, Gross Unrealized Losses (5,128) (516)
Held-to-maturity securities, fair value $ 99,804 $ 108,363
[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 GSE or agency and therefore carries an implicit guarantee of the U.S. government. These have been categorized as AAA/AA/A.