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Regulatory Matters (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Statutory Accounting Practices, Statutory Amount Available for Dividend Payments without Regulatory Approval $ 91.6  
Total Risk-based Capital Ratio: Adequately Capitalized Minimum: Ratio [1] 8.00% 8.00%
Total Risk-based Capital Ratio: Ratio [1] 15.67% 16.03%
Capital Ratios, Basel III, Capital Conservation Buffer 0.625%  
Capital Ratios, Basel III, Capital Conservation Buffer, Year Two 1.25%  
Capital Ratios, Basel III, Capital Conservation Buffer, Year Three 1.875%  
Capital Ratios, Basel III, Capital Conservation Buffer, Year Four 2.50%  
Bank [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Common Equity Tier 1 Risk-based Capital Ratio: Well Capitalized Minimum: Ratio [2] 6.50% 6.50%
Tier 1 Risk-based Capital Ratio: Well Capitalized Minimum: Ratio [3] 8.00% 8.00%
Tier 1 Leverage Ratio: Well Capitalized Minimum: Ratio [4] 5.00% 5.00%
Total Risk-based Capital Ratio: Well Capitalized Minimum: Ratio [1] 10.00% 10.00%
Capital ratios, capital conservation buffer 7.55%  
Total Risk-based Capital Ratio: Adequately Capitalized Minimum: Ratio [1] 8.00% 8.00%
Total Risk-based Capital Ratio: Ratio [1] 15.55% 16.02%
[1] Total risk-based capital / total risk-weighted assets
[2] As of December 31, 2015Regulatory RatiosAdequately CapitalizedWell CapitalizedActualMinimumMinimum(Dollars in thousands)AmountRatioAmountRatioAmountRatioCommon Equity Tier 1 Risk-based Capital Ratio (1) Corporation$ 106,082 14.77%$ 32,310 4.50%N/AN/ABank 106,180 14.76% 32,364 4.50%$ 46,747 6.50%Tier 1 Risk-based Capital Ratio (2)Corporation$ 106,082 14.77%$ 43,080 6.00%N/AN/ABank 106,180 14.76% 43,151 6.00%$ 57,535 8.00% Total Risk-based Capital Ratio (3) Corporation$ 115,101 16.03%$ 57,440 8.00%N/AN/ABank 115,214 16.02% 57,535 8.00%$ 71,919 10.00%Tier 1 Leverage Ratio (4) Corporation$ 106,082 10.38%$ 40,897 4.00%N/AN/ABank 106,180 10.37% 40,948 4.00%$ 51,185 5.00%Common equity Tier 1 capital / total risk-weighted assets
[3] Tier 1 capital / total risk-weighted assets
[4] Tier 1 capital / average quarterly assets