Investment Securities - Summary of Credit Rating of Debt Securities Portfolio (Details) - USD ($) $ in Thousands		Jun. 30, 2022	Dec. 31, 2021
Schedule of Available for Sale Securities and Held to Maturity Securities [Line Items]
Total available for sale securities		$ 173,952	$ 197,803
Total held to maturity securities		1,105,858	977,061
Municipal Securities
Schedule of Available for Sale Securities and Held to Maturity Securities [Line Items]
Total held to maturity securities		98,480	105,081
Corporate Debt Securities
Schedule of Available for Sale Securities and Held to Maturity Securities [Line Items]
Total available for sale securities		1,747	1,764
Total held to maturity securities		2,749	6,997
U.S. Government Sponsored Enterprise Obligations
Schedule of Available for Sale Securities and Held to Maturity Securities [Line Items]
Total available for sale securities		21,075	23,011
AAA/AA/A
Schedule of Available for Sale Securities and Held to Maturity Securities [Line Items]
Total available for sale securities		172,955	196,798
Total held to maturity securities		1,105,858	977,061
AAA/AA/A | Municipal Securities
Schedule of Available for Sale Securities and Held to Maturity Securities [Line Items]
Total held to maturity securities		98,480	105,081
AAA/AA/A | Corporate Debt Securities
Schedule of Available for Sale Securities and Held to Maturity Securities [Line Items]
Total available for sale securities		750	759
Total held to maturity securities		2,749	6,997
AAA/AA/A | U.S. Government Sponsored Enterprise Obligations
Schedule of Available for Sale Securities and Held to Maturity Securities [Line Items]
Total available for sale securities		21,075	23,011
BBB/BB/B
Schedule of Available for Sale Securities and Held to Maturity Securities [Line Items]
Total available for sale securities		997	1,005
Total held to maturity securities			977,061
BBB/BB/B | Municipal Securities
Schedule of Available for Sale Securities and Held to Maturity Securities [Line Items]
Total held to maturity securities			105,081
BBB/BB/B | Corporate Debt Securities
Schedule of Available for Sale Securities and Held to Maturity Securities [Line Items]
Total available for sale securities		997	1,005
Mortgage Backed Securities
Schedule of Available for Sale Securities and Held to Maturity Securities [Line Items]
Total available for sale securities	[1]	151,130	173,028
Total held to maturity securities	[1]	1,004,629	864,983
Mortgage Backed Securities | AAA/AA/A
Schedule of Available for Sale Securities and Held to Maturity Securities [Line Items]
Total available for sale securities	[1]	151,130	173,028
Total held to maturity securities	[1]	$ 1,004,629	$ 864,983

[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