Commitments and Loss Contingencies - Financial Instruments with Off-Balance Sheet Risk (Details)		3 Months Ended	6 Months Ended		12 Months Ended
	Oct. 26, 2021 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)	Oct. 31, 2021 item
Commitments and Contingencies
Reserve for legal settlement		$ 4,000,000		$ 4,000,000
Amount of settlement	$ 4,000,000
Legal costs	$ 1,000,000
Number of counts not sustained by court without leave to amend | item						2
Commitments to extend credit, fixed rate			$ 133,116,000		$ 122,155,000
Commitments to extend credit, variable rate			1,016,452,000		1,028,656,000
Commitment to extend credit, total			$ 1,149,568,000		1,150,811,000
Percentage of unused commitments to outstanding gross loans			37.00%	41.00%
Increase (decrease) to the allowance for credit losses on loans			$ (6,000)
Off-balance sheet, credit loss liability increase due to offsetting increase in loss factors in CECL model			821,000		815,000
Unused lines of credit and commitments to make loans
Commitments and Contingencies
Commitments to extend credit, fixed rate			129,214,000		119,071,000
Commitments to extend credit, variable rate			1,008,654,000		1,015,588,000
Commitment to extend credit, total			1,137,868,000		1,134,659,000
Standby letters of credit
Commitments and Contingencies
Commitments to extend credit, fixed rate			3,902,000		3,084,000
Commitments to extend credit, variable rate			7,798,000		13,068,000
Commitment to extend credit, total			$ 11,700,000		$ 16,152,000