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Regulatory Restrictions (Schedule of Capital Ratios) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Company [Member]    
Amount    
Common equity Tier 1 capital ratio, actual $ 456,826 $ 308,712
Total capital ratio, actual 532,907 377,847
Tier I capital ratio, actual 508,791 353,363
Leverage ratio, actual 508,791 353,363
Common equity Tier 1 capital ratio, fully phased-in regulatory guidelines minimum 298,406 197,968
Total capital ratio, fully phased-in regulatory guidelines minimum 447,609 296,952
Tier I capital ratio, fully phased-in regulatory guidelines minimum 362,350 240,390
Leverage ratio, for capital adequacy purposes $ 212,536 $ 138,981
Ratio    
Common equity Tier 1 capital ratio, actual 10.72% 10.92%
Total capital ratio, actual 12.50% 13.36%
Tier I capital ratio, actual 11.94% 12.49%
Leverage ratio, actual 9.58% 10.17%
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%
Bank [Member]    
Amount    
Common equity Tier 1 capital ratio, actual $ 507,496 $ 350,578
Total capital ratio, actual 531,612 375,062
Tier I capital ratio, actual 507,496 350,578
Leverage ratio, actual 507,496 350,578
Common equity Tier 1 capital ratio, fully phased-in regulatory guidelines minimum 298,277 197,858
Total capital ratio, fully phased-in regulatory guidelines minimum 447,416 296,787
Tier I capital ratio, fully phased-in regulatory guidelines minimum 362,194 240,256
Leverage ratio, for capital adequacy purposes 212,224 138,908
Common equity Tier 1 capital ratio, to be well capitalized under prompt corrective action provisions 276,972 183,725
Total capital ratio, to be well capitalized under prompt corrective action provisions 426,111 282,654
Tier I capital ratio, to be well capitalized under prompt corrective action provisions 340,889 226,124
Leverage ratio, to be well capitalized under prompt corrective action provisions $ 265,281 $ 173,634
Ratio    
Common equity Tier 1 capital ratio, actual 11.91% 12.40%
Total capital ratio, actual 12.48% 13.27%
Tier I capital ratio, actual 11.91% 12.40%
Leverage ratio, actual 9.57% 10.10%
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%