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Income Taxes (Narratives) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Taxes [Abstract]      
Effective Income Tax Rate Reconciliation State And Local Income Taxes 39.00% (39.00%) 39.00%
Unrecognized Tax Benefits, Interest on Income Taxes Accrued $ 229,000 $ 175,000  
Deferred Tax Assets, Net 124,200,000 145,901,000  
OtherComprehensiveIncomeLossTax 983,000 (544,000)  
Income Tax Expense (Benefit) 25,994,000 (17,554,000) $ 37,252,000
Exempt Income 10,000,000 17,600,000 40,500,000
Operating Loss Carryforwards 9,500,000    
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued 2,000,000 2,200,000  
Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations 1,363,000 0 281,000
Other tax position taken by management 1,100,000    
International Banking Entity [Member]      
Exempt Income $ 10,300,000 $ 6,300,000 $ 16,500,000