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Loans by Type (Schedule of the Aging of Loans by Loan Categories) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Participating Mortgage Loans [Line Items]    
Nonaccrual
Loans 714,861 686,231
Commercial and Industrial [Member]    
Participating Mortgage Loans [Line Items]    
Nonaccrual
Loans 257,236 236,394
Real Estate Commercial Mortgage [Member]    
Participating Mortgage Loans [Line Items]    
Nonaccrual
Loans 88,887 94,675
Real Estate Commercial Construction [Member]    
Participating Mortgage Loans [Line Items]    
Nonaccrual
Loans 21,347 9,359
Real Estate Church Related Mortgage [Member]    
Participating Mortgage Loans [Line Items]    
Nonaccrual
Loans 310,402 316,073
Real Estate Church Related Construction [Member]    
Participating Mortgage Loans [Line Items]    
Nonaccrual  
Loans 35,212 25,948
Industrial revenue bonds [Member]    
Participating Mortgage Loans [Line Items]    
Nonaccrual  
Loans 1,739 3,374
Other Financing Receivable [Member]    
Participating Mortgage Loans [Line Items]    
Nonaccrual  
Loans 38 408
Current [Member]    
Participating Mortgage Loans [Line Items]    
Current 714,861 686,231
Current [Member] | Commercial and Industrial [Member]    
Participating Mortgage Loans [Line Items]    
Current 257,236 236,394
Current [Member] | Real Estate Commercial Mortgage [Member]    
Participating Mortgage Loans [Line Items]    
Current 88,887 94,675
Current [Member] | Real Estate Commercial Construction [Member]    
Participating Mortgage Loans [Line Items]    
Current 21,347 9,359
Current [Member] | Real Estate Church Related Mortgage [Member]    
Participating Mortgage Loans [Line Items]    
Current 310,402 316,073
Current [Member] | Real Estate Church Related Construction [Member]    
Participating Mortgage Loans [Line Items]    
Current 35,212 25,948
Current [Member] | Industrial revenue bonds [Member]    
Participating Mortgage Loans [Line Items]    
Current 1,739 3,374
Current [Member] | Other Financing Receivable [Member]    
Participating Mortgage Loans [Line Items]    
Current 38 408
30 to 59 Days Past Due [Member]    
Participating Mortgage Loans [Line Items]    
Past due
30 to 59 Days Past Due [Member] | Commercial and Industrial [Member]    
Participating Mortgage Loans [Line Items]    
Past due
30 to 59 Days Past Due [Member] | Real Estate Commercial Mortgage [Member]    
Participating Mortgage Loans [Line Items]    
Past due
30 to 59 Days Past Due [Member] | Real Estate Commercial Construction [Member]    
Participating Mortgage Loans [Line Items]    
Past due
30 to 59 Days Past Due [Member] | Real Estate Church Related Mortgage [Member]    
Participating Mortgage Loans [Line Items]    
Past due
30 to 59 Days Past Due [Member] | Real Estate Church Related Construction [Member]    
Participating Mortgage Loans [Line Items]    
Past due
30 to 59 Days Past Due [Member] | Industrial revenue bonds [Member]    
Participating Mortgage Loans [Line Items]    
Past due
30 to 59 Days Past Due [Member] | Other Financing Receivable [Member]    
Participating Mortgage Loans [Line Items]    
Past due
60 to 89 Days Past Due [Member]    
Participating Mortgage Loans [Line Items]    
Past due
60 to 89 Days Past Due [Member] | Commercial and Industrial [Member]    
Participating Mortgage Loans [Line Items]    
Past due
60 to 89 Days Past Due [Member] | Real Estate Commercial Mortgage [Member]    
Participating Mortgage Loans [Line Items]    
Past due
60 to 89 Days Past Due [Member] | Real Estate Commercial Construction [Member]    
Participating Mortgage Loans [Line Items]    
Past due
60 to 89 Days Past Due [Member] | Real Estate Church Related Mortgage [Member]    
Participating Mortgage Loans [Line Items]    
Past due
60 to 89 Days Past Due [Member] | Real Estate Church Related Construction [Member]    
Participating Mortgage Loans [Line Items]    
Past due
60 to 89 Days Past Due [Member] | Industrial revenue bonds [Member]    
Participating Mortgage Loans [Line Items]    
Past due
60 to 89 Days Past Due [Member] | Other Financing Receivable [Member]    
Participating Mortgage Loans [Line Items]    
Past due
90 Days and Over [Member]    
Participating Mortgage Loans [Line Items]    
Past due
90 Days and Over [Member] | Commercial and Industrial [Member]    
Participating Mortgage Loans [Line Items]    
Past due
90 Days and Over [Member] | Real Estate Commercial Mortgage [Member]    
Participating Mortgage Loans [Line Items]    
Past due
90 Days and Over [Member] | Real Estate Commercial Construction [Member]    
Participating Mortgage Loans [Line Items]    
Past due
90 Days and Over [Member] | Real Estate Church Related Mortgage [Member]    
Participating Mortgage Loans [Line Items]    
Past due
90 Days and Over [Member] | Real Estate Church Related Construction [Member]    
Participating Mortgage Loans [Line Items]    
Past due
90 Days and Over [Member] | Industrial revenue bonds [Member]    
Participating Mortgage Loans [Line Items]    
Past due
90 Days and Over [Member] | Other Financing Receivable [Member]    
Participating Mortgage Loans [Line Items]    
Past due