Regulatory Requirements - Regulatory Capital Amounts And Ratios Compared To Regulatory Requirements (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Jan. 01, 2015	Dec. 31, 2014
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common Equity Tier 1 Capital (to risk-weighted assets), amount	$ 546,564
Common Equity Tier 1 Capital (to risk-weighted assets), ratio	22.15%	2.50%
Common Equity Tier 1 Capital (to risk-weighted assets), for capital adequacy purposes amount	$ 111,025
Common Equity Tier 1 Capital (to risk-weighted assets), for capital adequacy purposes ratio	4.50%	4.50%
Common Equity Tier 1 Capital (to risk-weighted assets), for well capitalized under prompt corrective action provisions amount	$ 160,369
Common Equity Tier 1 Capital (to risk-weighted assets), for well capitalized under prompt corrective action provisions ratio	6.50%
Tier 1 capital (core) (to adjusted total assets), amount	$ 546,564
Tier 1 capital (core) (to adjusted total assets), ratio	17.25%
Tier 1 capital (core) (to adjusted total assets), for capital adequacy purposes amount	$ 126,764
Tier 1 capital (core) (to adjusted total assets), for capital adequacy purposes ratio	4.00%
Tier 1 capital (core) (to adjusted total assets), for well capitalized under prompt corrective action provisions amount	$ 158,455
Tier 1 capital (core) (to adjusted total assets), for well capitalized under prompt corrective action provisions ratio	5.00%
Tier 1 capital (to risk-weighted assets), amount	$ 546,564
Tier 1 capital (to risk-weighted assets), ratio	22.15%
Tier 1 capital (to risk-weighted assets), for capital adequacy purposes amount	$ 148,033
Tier 1 capital (to risk-weighted assets), for capital adequacy purposes ratio	6.00%	6.00%	4.00%
Tier 1 capital (to risk-weighted assets) for well capitalized under prompt corrective action provisions amount	$ 197,378
Tier 1 capital (to risk-weighted assets) for well capitalized under prompt corrective action provisions ratio	8.00%
Total capital (to risk-weighted assets), actual	$ 571,720
Total capital (to risk-weighted assets), ratio	23.17%
Total capital (to risk-weighted assets), for capital adequacy purposes amount	$ 197,378
Total capital (to risk-weighted assets), for capital adequacy purposes ratio	8.00%
Total capital (to risk-weighted assets), for well capitalized under prompt corrective action provisions amount	$ 246,722
Total capital (to risk-weighted assets), for well capitalized under prompt corrective action provisions ratio	10.00%
Subsidiaries
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common Equity Tier 1 Capital (to risk-weighted assets), amount	$ 498,067
Common Equity Tier 1 Capital (to risk-weighted assets), ratio	20.19%
Common Equity Tier 1 Capital (to risk-weighted assets), for capital adequacy purposes amount	$ 111,025
Common Equity Tier 1 Capital (to risk-weighted assets), for capital adequacy purposes ratio	4.50%
Common Equity Tier 1 Capital (to risk-weighted assets), for well capitalized under prompt corrective action provisions amount	$ 160,369
Common Equity Tier 1 Capital (to risk-weighted assets), for well capitalized under prompt corrective action provisions ratio	6.50%
Tangible capital to tangible assets, actual			$ 494,131
Tangible capital to tangible assets, ratio			16.46%
Tangible capital to tangible assets, for capital adequacy purposes amount			$ 45,036
Tangible capital to tangible assets, for capital adequacy purposes ratio			1.50%
Tier 1 capital (core) (to adjusted total assets), amount	$ 498,067		$ 494,131
Tier 1 capital (core) (to adjusted total assets), ratio	15.72%		16.46%
Tier 1 capital (core) (to adjusted total assets), for capital adequacy purposes amount	$ 126,744		$ 120,096
Tier 1 capital (core) (to adjusted total assets), for capital adequacy purposes ratio	4.00%		4.00%
Tier 1 capital (core) (to adjusted total assets), for well capitalized under prompt corrective action provisions amount	$ 158,429		$ 150,119
Tier 1 capital (core) (to adjusted total assets), for well capitalized under prompt corrective action provisions ratio	5.00%		5.00%
Tier 1 capital (to risk-weighted assets), amount	$ 498,067
Tier 1 capital (to risk-weighted assets), ratio	20.19%
Tier 1 capital (to risk-weighted assets), for capital adequacy purposes amount	$ 148,033
Tier 1 capital (to risk-weighted assets), for capital adequacy purposes ratio	6.00%
Tier 1 capital (to risk-weighted assets) for well capitalized under prompt corrective action provisions amount	$ 197,378
Tier 1 capital (to risk-weighted assets) for well capitalized under prompt corrective action provisions ratio	8.00%
Total capital (to risk-weighted assets), actual	$ 523,223		$ 520,875
Total capital (to risk-weighted assets), ratio	21.21%		22.95%
Total capital (to risk-weighted assets), for capital adequacy purposes amount	$ 197,378		$ 181,585
Total capital (to risk-weighted assets), for capital adequacy purposes ratio	8.00%		8.00%
Total capital (to risk-weighted assets), for well capitalized under prompt corrective action provisions amount	$ 246,722		$ 226,982
Total capital (to risk-weighted assets), for well capitalized under prompt corrective action provisions ratio	10.00%		10.00%