Other Comprehensive (Loss) Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ 173,911	$ 160,709
Total other comprehensive income (loss), net of tax	655	(986)
Ending balance	181,186	164,305
Reclassification to unappropriated retained earnings	98,331		$ 90,669
Accumulated other comprehensive (loss) income
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(1,189)	154
Total other comprehensive income (loss), net of tax	655	(986)
Ending balance	(534)	(832)
Accounting Standards Update 2016-01 and 2018-02
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Reclassification to unappropriated retained earnings	35	35
Accounting Standards Update 2016-01 and 2018-02 | Net unrealized (losses) gains on securities
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(179)	316
Other comprehensive income (loss) before reclassifications	306	(131)
Less amounts reclassified from accumulated other comprehensive income (loss)	245	(134)
Total other comprehensive income (loss), net of tax	61	3
Ending balance	(118)	320
Accounting Standards Update 2016-01 and 2018-02 | Adjustments related to defined benefit plan
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(238)	(295)
Less amounts reclassified from accumulated other comprehensive income (loss)	(15)	(15)
Total other comprehensive income (loss), net of tax	15	15
Ending balance	(223)	(280)
Accounting Standards Update 2016-01 and 2018-02 | Net unrealized (losses) gains from cash flow hedges
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(737)	168
Other comprehensive income (loss) before reclassifications	579	(1,004)
Total other comprehensive income (loss), net of tax	579	(1,004)
Ending balance	(158)	(836)
Accounting Standards Update 2016-01 and 2018-02 | Accumulated other comprehensive (loss) income
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(1,154)	189
Other comprehensive income (loss) before reclassifications	885	(1,135)
Less amounts reclassified from accumulated other comprehensive income (loss)	230	(149)
Total other comprehensive income (loss), net of tax	655	(986)
Ending balance	$ (499)	$ (797)