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Regulatory Restrictions (Schedule of Capital Ratios) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Company [Member]    
Amount    
Common equity Tier 1 capital ratio, actual $ 535,566 $ 456,826
Total capital ratio, actual 609,428 532,907
Tier I capital ratio, actual 587,764 508,791
Leverage ratio, actual 587,764 508,791
Common equity Tier 1 capital ratio, fully phased-in regulatory guidelines minimum 305,287 298,406
Total capital ratio, fully phased-in regulatory guidelines minimum 457,930 447,609
Tier I capital ratio, fully phased-in regulatory guidelines minimum 370,705 362,350
Leverage ratio, for capital adequacy purposes $ 224,014 $ 212,536
Ratio    
Common equity Tier 1 capital ratio, actual 12.28% 10.72%
Total capital ratio, actual 13.97% 12.50%
Tier I capital ratio, actual 13.48% 11.94%
Leverage ratio, actual 10.50% 9.58%
Common equity Tier 1 capital ratio, fully phased-in regulatory guidelines minimum 7.00% 7.00%
Total capital ratio, for capital adequacy purposes 10.47% 10.50%
Tier I capital ratio, for capital adequacy purposes 8.50% 8.50%
Leverage ratio, for capital adequacy purposes 4.00% 4.00%
Bank [Member]    
Amount    
Common equity Tier 1 capital ratio, actual $ 586,053 $ 507,496
Total capital ratio, actual 607,717 531,612
Tier I capital ratio, actual 586,053 507,496
Leverage ratio, actual 586,053 507,496
Common equity Tier 1 capital ratio, fully phased-in regulatory guidelines minimum 305,163 298,277
Total capital ratio, fully phased-in regulatory guidelines minimum 457,745 447,416
Tier I capital ratio, fully phased-in regulatory guidelines minimum 370,555 362,194
Leverage ratio, for capital adequacy purposes 224,406 212,224
Common equity Tier 1 capital ratio, to be well capitalized under prompt corrective action provisions 283,366 276,972
Total capital ratio, to be well capitalized under prompt corrective action provisions 435,948 426,111
Tier I capital ratio, to be well capitalized under prompt corrective action provisions 348,758 340,889
Leverage ratio, to be well capitalized under prompt corrective action provisions $ 280,508 $ 265,281
Ratio    
Common equity Tier 1 capital ratio, actual 13.44% 11.91%
Total capital ratio, actual 13.94% 12.48%
Tier I capital ratio, actual 13.44% 11.91%
Leverage ratio, actual 10.45% 9.57%
Common equity Tier 1 capital ratio, fully phased-in regulatory guidelines minimum 7.00% 7.00%
Total capital ratio, for capital adequacy purposes 10.50% 10.50%
Tier I capital ratio, for capital adequacy purposes 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%