Stockholders' Equity - Regulatory Capital Requirements (Details) $ in Thousands		Dec. 31, 2020 USD ($)		Dec. 31, 2019 USD ($)
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Basel III additional capital conservation buffer at full phase-in		2.50%		2.50%
Total capital to RWA, actual, amount		$ 415,999		$ 328,961
Total capital to RWA, actual, ratio		0.1462		0.1188
Total capital to RWA, minimum capital for capital adequacy purposes, amount		$ 227,631		$ 221,435
Total capital to RWA, minimum capacity for adequacy purposes		0.0800	[1]	0.0800
Tier 1 Capital to RWA, actual, amount		$ 306,577		$ 280,475
Tier 1 capital to RWA, actual, ratio		0.1077		0.1013
Tier 1 capital to RWA, minimum capital for capital adequacy purposes, amount		$ 170,723		$ 166,077
Tier 1 capital to RWA, minimum capacity for capital adequacy purposes, ratio		0.0600	[1]	0.0600
Tier 1 capital to AA leverage ratio, actual, amount		$ 306,577		$ 280,475
Tier 1 capital to AA leverage ratio, actual, ratio		0.0752		0.0886
Tier 1 capital to AA leverage ratio, minimum capital for capital adequacy purposes, amount		$ 163,127		$ 126,661
Tier 1 capital to AA leverage ratio, minimum capacity for capital adequacy purposes, ratio		0.0400	[1]	0.0400
Common equity tier 1 capital to RWA, actual, amount		$ 306,577		$ 280,475
Common equity tier 1 capital to RWA, actual, ratio		10.77%		10.13%
Common equity tier 1 capital to RWA, minimum capital for capital adequacy purposes, amount		$ 128,042		$ 124,557
Common equity tier 1 capital to RWA, minimum capital for capital adequacy purposes, ratio		4.50%	[1]	4.50%
The Bank
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total capital to RWA, actual, amount		$ 413,862		$ 328,489
Total capital to RWA, actual, ratio		0.1455		0.1187
Total capital to RWA, minimum capital for capital adequacy purposes, amount		$ 227,631		$ 221,435
Total capital to RWA, minimum capacity for adequacy purposes		0.0800	[1]	0.0800
Total capital to RWA, minimum capital to be well capitalized, amount		$ 284,538		$ 276,794
Total Capital to RWA, minimum capital to be well capitalized, ratio	[2]	0.1000		0.1000
Tier 1 Capital to RWA, actual, amount		$ 378,184		$ 294,875
Tier 1 capital to RWA, actual, ratio		0.1329		0.1065
Tier 1 capital to RWA, minimum capital for capital adequacy purposes, amount		$ 170,723		$ 166,077
Tier 1 capital to RWA, minimum capacity for capital adequacy purposes, ratio		0.0600	[1]	0.0600
Tier 1 capital to RWA, minimum capital to be well capitalized, amount		$ 227,631		$ 221,435
Tier 1 capital to RWA, minimum capital to be well capitalized, ratio	[2]	0.0800		0.0800
Tier 1 capital to AA leverage ratio, actual, amount		$ 378,184		$ 294,875
Tier 1 capital to AA leverage ratio, actual, ratio		0.0927		0.0931
Tier 1 capital to AA leverage ratio, minimum capital for capital adequacy purposes, amount		$ 163,127		$ 126,661
Tier 1 capital to AA leverage ratio, minimum capacity for capital adequacy purposes, ratio		0.0400	[1]	0.0400
Tier 1 capital to AA leverage ratio, minimum capital to be well capitalized, amount		$ 203,909		$ 158,326
Tier 1 capital to AA leverage ratio, minimum capital to be well capitalized, ratio	[2]	0.0500		0.0500
Common equity tier 1 capital to RWA, actual, amount		$ 378,184		$ 294,875
Common equity tier 1 capital to RWA, actual, ratio		13.29%		10.65%
Common equity tier 1 capital to RWA, minimum capital for capital adequacy purposes, amount		$ 128,042		$ 124,557
Common equity tier 1 capital to RWA, minimum capital for capital adequacy purposes, ratio		4.50%	[1]	4.50%
Common equity tier 1 capital to RWA, minimum capital to be well capitalized, amount		$ 184,950		$ 179,916
Common equity tier 1 capital to RWA, minimum capital to be well capitalized, ratio	[2]	6.50%		6.50%

[1] Before application of the capital conservation buffer of 2.50% as of December 31, 2020 and December 31, 2019. See discussion below.

[2] For the Bank to qualify as "well-capitalized," it must maintain at least the minimum ratios listed under the regulatory prompt corrective action framework. This framework does not apply to the Company.