Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Deferred tax assets:
Allowance for credit losses on loans	$ 14,171	$ 12,716
Lease accounting	9,703	10,245
Defined postretirement benefit obligation	7,585	9,934
Securities available-for-sale	4,690
Accrued expenses	3,440	2,681
State income taxes	1,924	1,164
Federal net operating loss carryforwards	1,719	2,206
Premises and equipment	1,677	2,173
Stock compensation	1,363	1,632
California net operating loss carryforwards	1,106	1,489
Nonaccrual interest	174	67
Split-dollar life insurance benefit plan	49	84
Other	201	869
Total deferred tax assets	47,802	45,260
Deferred tax liabilities:
Lease accounting	(9,703)	(10,245)
Loan fees	(2,304)	(2,174)
Intangible liabilities	(1,940)	(1,916)
Prepaid expenses	(1,304)	(972)
FHLB stock	(156)	(166)
I/O strips	(40)	(60)
Securities available-for-sale		(823)
Other	(179)	(147)
Total deferred tax liabilities	(15,626)	(16,503)
Net deferred tax assets	$ 32,176	$ 28,757