Loans and Allowance for Credit Losses - Additional Information (Details) - USD ($)		12 Months Ended
	Jan. 01, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Loans and Allowance for Credit Losses
Loans receivable, allowance for credit losses		$ 63,480,000	$ 60,754,000
Troubled debt restructurings internal grading system substandard		1,700,000	2,900,000
TDR loans, Balance		2,949,000	3,851,000
Non-accrual loans for no related allowance amortized cost		2,100,000
TDR loans evaluated on individual	$ 100,000	100,000
After-tax effect decreased retained earnings	14,200,000
Allowance for credit losses	67,300,000
FDIC-acquired loans and remaining Accretable yield			429,000
Minimum loan balance with addition to TDR status for classification of loans into Collateral-dependent loans		100,000
Interest income		0	0
Financing Receivables, Troubled Debt Restructuring		2,900,000	3,900,000
Allowance for credit losses		(63,480,000)	(60,754,000)	$ (67,338,000)
CECL adoption
Loans and Allowance for Credit Losses
Allowance for credit losses				(11,595,000)
Allowance for unfunded commitment
Loans and Allowance for Credit Losses
Allowance for credit losses	8,700,000
Allowance for credit losses		(12,816,000)	(9,629,000)	$ (8,690,000)
Allowance for unfunded commitment | CECL adoption
Loans and Allowance for Credit Losses
Allowance for credit losses					$ (8,690,000)
Commercial real estate
Loans and Allowance for Credit Losses
TDR loans, Balance		$ 1,571,000	$ 1,811,000
PCI
Loans and Allowance for Credit Losses
Allowance for credit losses	1,900,000
Adopted ASC 326
Loans and Allowance for Credit Losses
Allowance for credit losses	11,600,000
CECL Methodology
Loans and Allowance for Credit Losses
Allowance for credit losses	11,600,000
Allowance for credit loss remaining discount on loan	1,900,000
CECL Methodology | Allowance for unfunded commitment
Loans and Allowance for Credit Losses
Allowance for credit losses	$ 8,700,000