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Investment in Qualified Affordable Housing (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Investment in qualified affordable housing tax credits amortization $ 7,322 $ 10,278 $ 7,300
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00% 35.00% 35.00%
Affordable Housing Tax Credits and Other Tax Benefits, Amount $ 8,997 $ 9,438 $ 9,350
Affordable Housing Program Obligation 22,282 14,282  
Qualified Affordable Housing [Domain]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Equity investments $ 50,347 49,669  
Change in Accounting Method Accounted for as Change in Estimate [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Investment in qualified affordable housing tax credits amortization   $ 3,100