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Regulatory Restrictions (Schedule of Capital Ratios) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Company [Member]    
Amount    
Common equity Tier 1 capital ratio, actual $ 610,642 $ 535,566
Capital 684,931 609,428
Tier One Risk Based Capital 662,987 587,764
Tier One Leverage Capital 662,987 587,764
Common equity Tier 1 capital ratio, fully phased-in regulatory guidelines minimum 321,994 305,287
Capital Required for Capital Adequacy 482,991 457,930
Tier One Risk Based Capital Required for Capital Adequacy 390,993 370,705
Tier One Leverage Capital Required for Capital Adequacy $ 236,904 $ 224,014
Ratio    
Common equity Tier 1 capital ratio, actual 13.28% 12.28%
Total capital ratio, actual 14.89% 13.97%
Tier I capital ratio, actual 14.41% 13.48%
Leverage ratio, actual 11.19% 10.47%
Common equity Tier 1 capital ratio, fully phased-in regulatory guidelines minimum 7.00% 7.00%
Capital Required for Capital Adequacy to Risk Weighted Assets 10.50% 10.50%
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets 8.50% 8.50%
Leverage ratio, for capital adequacy purposes 4.00% 4.00%
Bank [Member]    
Amount    
Common equity Tier 1 capital ratio, actual $ 661,234 $ 586,053
Capital 683,178 607,717
Tier One Risk Based Capital 661,234 586,053
Tier One Leverage Capital 661,234 586,053
Common equity Tier 1 capital ratio, fully phased-in regulatory guidelines minimum 321,866 305,163
Capital Required for Capital Adequacy 482,799 457,745
Tier One Risk Based Capital Required for Capital Adequacy 390,837 370,555
Tier One Leverage Capital Required for Capital Adequacy 236,700 224,406
Common equity Tier 1 capital ratio, to be well capitalized under prompt corrective action provisions 298,875 283,366
Capital Required to be Well Capitalized 459,808 435,948
Tier One Risk Based Capital Required to be Well Capitalized 367,846 348,758
Tier One Leverage Capital Required to be Well Capitalized $ 295,875 $ 280,508
Ratio    
Common equity Tier 1 capital ratio, actual 14.38% 13.44%
Total capital ratio, actual 14.86% 13.94%
Tier I capital ratio, actual 14.38% 13.44%
Leverage ratio, actual 11.17% 10.45%
Common equity Tier 1 capital ratio, fully phased-in regulatory guidelines minimum 7.00% 7.00%
Capital Required for Capital Adequacy to Risk Weighted Assets 10.50% 10.50%
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets 8.50% 8.50%
Leverage ratio, for capital adequacy purposes 4.00% 4.00%
Common equity Tier 1 capital ratio, To Be Well Capitalized Under Prompt Corrective Action Provisions 6.50% 6.50%
Total capital ratio, to be well capitalized under prompt corrective action provisions 10.00% 10.00%
Tier I capital ratio, to be well capitalized under prompt corrective action provisions 8.00% 8.00%
Leverage ratio, to be well capitalized under prompt corrective action provisions 5.00% 5.00%