Income Taxes - Significant components of deferred tax assets and liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Deferred tax assets
Allowance for credit losses	$ 18,490	$ 19,736
Deferred loan fees and costs	6,736	6,559
Leases	7,195	9,283
Stock-based compensation	1,796	1,132
Net operating loss	7,736	7,623
Unrealized loss on securities available-for-sale	50,442	4,987
Unrealized loss on securities held-to-maturity	14,366	0
SERP	2,495	5,631
Premises and equipment	(205)	1,328
Other assets	1,344	2,011
Valuation allowances	(7,008)	(6,724)
Total deferred tax assets	103,387	51,566
Deferred tax liabilities
Excess servicing	(589)	(402)
Leases	(6,034)	(7,990)
Other liabilities	(197)	0
Total deferred tax liabilities	(6,820)	(8,392)
Net deferred income tax assets	$ 96,567	$ 43,174