Regulatory Capital Requirements (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Jan. 01, 2019
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 common equity, (to risk-weighted assets), Actual Amount	$ 342,159	$ 313,803
Tier 1 common equity, (to risk-weighted assets), Actual Ratio (as a percent)	11.31%	10.84%
Tier 1 common equity, (to risk-weighted assets), Minimum Capital Requirement, Ratio (as a percent)			7.00%
Capital	$ 451,246	$ 405,171
Capital to Risk Weighted Assets	0.1491	0.1399
Capital Required for Capital Adequacy to Risk Weighted Assets			0.105
Tier 1 capital (to risk-weighted assets), Actual Amount	$ 342,159	$ 313,803
Tier 1 capital (to risk-weighted assets), Actual Ratio (as a percent)	0.1131	0.1084
Tier 1 capital (to risk-weighted assets), Minimum Capital Requirement, Ratio (as a percent)			0.085
Tier 1 capital (to average assets), Actual Amount	$ 342,159	$ 313,803
Tier 1 capital (to average assets), Actual Ratio (as a percent)	0.0795	0.0764
Tier 1 capital (to average assets), Minimum Capital Requirement, Ratio (as a percent)			0.040
Bank
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 common equity, (to risk-weighted assets), Actual Amount	$ 377,678	$ 341,242
Tier 1 common equity, (to risk-weighted assets), Actual Ratio (as a percent)	12.49%	11.80%
Tier One Common Equity Required to be Well Capitalized	$ 196,497	$ 188,017
Tier One Common Equity Required to be Well Capitalized to Risk Weighted Assets	6.50%	6.50%
Capital	$ 407,162	$ 363,082
Capital to Risk Weighted Assets	0.1347	0.1255
Capital Required to be Well Capitalized	$ 302,303	$ 289,257
Capital Required to be Well Capitalized to Risk Weighted Assets	0.1000	0.1000
Tier 1 capital (to risk-weighted assets), Actual Amount	$ 377,678	$ 341,242
Tier 1 capital (to risk-weighted assets), Actual Ratio (as a percent)	0.1249	0.1180
Tier 1 capital (to risk-weighted assets), Minimum to be Wel Capitalized Under Prompt Corrective Actions, Amount	$ 241,842	$ 231,406
Tier 1 capital (to risk-weighted assets), Minimum to be Wel Capitalized Under Prompt Corrective Actions, Ratio (as a percent)	0.0800	0.0800
Tier 1 capital (to average assets), Actual Amount	$ 377,678	$ 341,242
Tier 1 capital (to average assets), Actual Ratio (as a percent)	0.0878	0.0832
Tier 1 capital (to average assets), Minimum to be Well Capitalized Under Prompt Corrective Actions, Amount	$ 215,045	$ 205,151
Tier 1 capital (to average assets), Minimum to be Well Capitalized Under Prompt Corrective Actions, Ratio (as a percent)	0.0500	0.0500
2016 Period
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 common equity, (to risk-weighted assets), Minimum Capital Requirement, Actual Amount			$ 211,828
Tier 1 common equity, (to risk-weighted assets), Minimum Capital Requirement, Ratio (as a percent)			7.00%
Capital Required for Capital Adequacy			$ 317,742
Capital Required for Capital Adequacy to Risk Weighted Assets			0.1050
Tier 1 capital (to risk-weighted assets), Minimum Capital Requirement, Amount			$ 257,220
Tier 1 capital (to risk-weighted assets), Minimum Capital Requirement, Ratio (as a percent)			0.0850
Tier 1 capital (to average assets), Minimum Capital Requirement, Amount			$ 172,154
Tier 1 capital (to average assets), Minimum Capital Requirement, Ratio (as a percent)			0.0400
2016 Period | Bank
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 common equity, (to risk-weighted assets), Minimum Capital Requirement, Actual Amount			$ 211,612
Tier 1 common equity, (to risk-weighted assets), Minimum Capital Requirement, Ratio (as a percent)			7.00%
Capital Required for Capital Adequacy			$ 317,418
Capital Required for Capital Adequacy to Risk Weighted Assets			0.1050
Tier 1 capital (to risk-weighted assets), Minimum Capital Requirement, Amount			$ 256,957
Tier 1 capital (to risk-weighted assets), Minimum Capital Requirement, Ratio (as a percent)			0.0850
Tier 1 capital (to average assets), Minimum Capital Requirement, Amount			$ 172,036
Tier 1 capital (to average assets), Minimum Capital Requirement, Ratio (as a percent)			0.0400
Two Thousand Fifteen Period
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 common equity, (to risk-weighted assets), Minimum Capital Requirement, Actual Amount			$ 202,661
Tier 1 common equity, (to risk-weighted assets), Minimum Capital Requirement, Ratio (as a percent)			7.00%
Capital Required for Capital Adequacy			$ 303,991
Capital Required for Capital Adequacy to Risk Weighted Assets			0.1050
Tier 1 capital (to risk-weighted assets), Minimum Capital Requirement, Amount			$ 246,088
Tier 1 capital (to risk-weighted assets), Minimum Capital Requirement, Ratio (as a percent)			0.0850
Tier 1 capital (to average assets), Minimum Capital Requirement, Amount			$ 164,219
Tier 1 capital (to average assets), Minimum Capital Requirement, Ratio (as a percent)			0.0400
Two Thousand Fifteen Period | Bank
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 common equity, (to risk-weighted assets), Minimum Capital Requirement, Actual Amount			$ 202,480
Tier 1 common equity, (to risk-weighted assets), Minimum Capital Requirement, Ratio (as a percent)			7.00%
Capital Required for Capital Adequacy			$ 303,720
Capital Required for Capital Adequacy to Risk Weighted Assets			0.1050
Tier 1 capital (to risk-weighted assets), Minimum Capital Requirement, Amount			$ 245,869
Tier 1 capital (to risk-weighted assets), Minimum Capital Requirement, Ratio (as a percent)			0.0850
Tier 1 capital (to average assets), Minimum Capital Requirement, Amount			$ 164,121
Tier 1 capital (to average assets), Minimum Capital Requirement, Ratio (as a percent)			0.0400