Regulatory Matters (Details) $ in Thousands	Sep. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)
Total Capital to Risk-Weighted Assets
Actual, amount	$ 652,827	$ 633,228
Actual, ratio	0.132	0.134
Tier I Capital to Risk-Weighted Assets
Actual, amount	$ 590,952	$ 576,332
Actual, ratio	0.120	0.122
Common Equity Tier 1 to Risk-Weighted Assets
Actual, amount	$ 590,000	$ 575,411
Actual, ratio	0.120	0.122
Tier I Capital to Average Assets
Actual, amount	$ 590,952	$ 576,332
Actual, ratio	0.108	0.121
Bank
Total Capital to Risk-Weighted Assets
Actual, amount	$ 601,491	$ 581,600
Actual, ratio	0.122	0.123
Required to be considered well capitalized, amount	$ 493,393	$ 471,385
Required to be considered well capitalized, ratio	0.100	0.100
Tier I Capital to Risk-Weighted Assets
Actual, amount	$ 539,639	$ 524,704
Actual, ratio	0.109	0.111
Required to be considered well capitalized, amount	$ 394,714	$ 377,108
Required to be considered well capitalized, ratio	0.080	0.080
Common Equity Tier 1 to Risk-Weighted Assets
Actual, amount	$ 539,639	$ 524,704
Actual, ratio	0.109	0.111
Required to be considered well capitalized, amount	$ 320,706	$ 306,400
Required to be considered well capitalized, ratio	6.50%	6.50%
Tier I Capital to Average Assets
Actual, amount	$ 539,639	$ 524,704
Actual, ratio	0.099	0.110
Required to be considered well capitalized, amount	$ 272,492	$ 238,963
Required to be considered well capitalized, ratio	0.050	0.050
Minimum Capital Required - Basel III Fully Phased-In
Total Capital to Risk-Weighted Assets
Minimum capital required, Basel III fully phased-in, amount	$ 518,259	$ 495,095
Minimum capital required, Basel III fully phased-in, ratio	0.105	0.105
Tier I Capital to Risk-Weighted Assets
Minimum capital required, Basel III fully phased-in, amount	$ 419,543	$ 400,791
Minimum capital required, Basel III fully phased-in, ratio	0.085	0.085
Common Equity Tier 1 to Risk-Weighted Assets
Minimum capital required, Basel III fully phased-in, amount	$ 345,506	$ 330,063
Minimum capital required, Basel III fully phased-in, ratio	7.00%	7.00%
Tier I Capital to Average Assets
Minimum capital required, Basel III fully phased-in, amount	$ 217,932	$ 191,099
Minimum capital required, Basel III fully phased-in, ratio	0.040	0.040
Minimum Capital Required - Basel III Fully Phased-In | Bank
Total Capital to Risk-Weighted Assets
Minimum capital required, Basel III fully phased-in, amount	$ 518,063	$ 494,954
Minimum capital required, Basel III fully phased-in, ratio	0.105	0.105
Tier I Capital to Risk-Weighted Assets
Minimum capital required, Basel III fully phased-in, amount	$ 419,384	$ 400,677
Minimum capital required, Basel III fully phased-in, ratio	0.085	0.085
Common Equity Tier 1 to Risk-Weighted Assets
Minimum capital required, Basel III fully phased-in, amount	$ 345,375	$ 329,970
Minimum capital required, Basel III fully phased-in, ratio	7.00%	7.00%
Tier I Capital to Average Assets
Minimum capital required, Basel III fully phased-in, amount	$ 217,994	$ 191,170
Minimum capital required, Basel III fully phased-in, ratio	0.040	0.040