Investment Securities - Summary of Credit Quality Indicators of Available-for-Sale Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Schedule of Available-for-sale Securities [Line Items]
Investment securities available-for-sale (at fair value)	$ 620,445	$ 706,289
AAA
Schedule of Available-for-sale Securities [Line Items]
Investment securities available-for-sale (at fair value)	617,652	703,445
Not Rated
Schedule of Available-for-sale Securities [Line Items]
Investment securities available-for-sale (at fair value)	2,793	2,844
U.S. Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities available-for-sale (at fair value)	71,862	71,388
U.S. Treasury Securities [Member] \| AAA
Schedule of Available-for-sale Securities [Line Items]
Investment securities available-for-sale (at fair value)	71,862	71,388
Residential Mortgage Pass-Through Securities Issued or Guaranteed by U.S. Government Agencies or Sponsored Enterprises [Member].
Schedule of Available-for-sale Securities [Line Items]
Investment securities available-for-sale (at fair value)	196,848	226,131
Residential Mortgage Pass-Through Securities Issued or Guaranteed by U.S. Government Agencies or Sponsored Enterprises [Member]. \| AAA
Schedule of Available-for-sale Securities [Line Items]
Investment securities available-for-sale (at fair value)	196,848	226,131
Other Residential MBS Issued or Guaranteed by U.S. Government Agencies or Sponsored Enterprises [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities available-for-sale (at fair value)	348,942	405,926
Other Residential MBS Issued or Guaranteed by U.S. Government Agencies or Sponsored Enterprises [Member] \| AAA
Schedule of Available-for-sale Securities [Line Items]
Investment securities available-for-sale (at fair value)	348,942	405,926
Municipal Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities available-for-sale (at fair value)	152	153
Municipal Securities [Member] \| Not Rated
Schedule of Available-for-sale Securities [Line Items]
Investment securities available-for-sale (at fair value)	152	153
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities available-for-sale (at fair value)	1,849	1,920
Corporate Debt Securities [Member] \| Not Rated
Schedule of Available-for-sale Securities [Line Items]
Investment securities available-for-sale (at fair value)	1,849	1,920
Other Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities available-for-sale (at fair value)	792	771
Other Securities [Member] \| Not Rated
Schedule of Available-for-sale Securities [Line Items]
Investment securities available-for-sale (at fair value)	$ 792	$ 771