Loans (Analysis of Nonaccrual Loans) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment Nonaccrual Loans	$ 60,332	$ 66,189
Unpaid Principal Balance Nonaccrual Loans	72,797	79,886
Secured Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment Nonaccrual Loans	45,753	45,410
Unpaid Principal Balance Nonaccrual Loans	57,049	56,865
Unsecured Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment Nonaccrual Loans	0	50
Unpaid Principal Balance Nonaccrual Loans	0	49
One-to-Four Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment Nonaccrual Loans	501	785
Unpaid Principal Balance Nonaccrual Loans	508	1,182
Commercial Land [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment Nonaccrual Loans	2,461	2,628
Unpaid Principal Balance Nonaccrual Loans	2,470	2,623
Income Property Multifamily [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment Nonaccrual Loans	1,873	4,284
Unpaid Principal Balance Nonaccrual Loans	2,523	5,410
Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment Nonaccrual Loans	6,678	7,029
Unpaid Principal Balance Nonaccrual Loans	6,992	7,270
Land And Acquisition [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment Nonaccrual Loans	318	25
Unpaid Principal Balance Nonaccrual Loans	318	26
Residential Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment Nonaccrual Loans	0	1,829
Unpaid Principal Balance Nonaccrual Loans	0	1,828
Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment Nonaccrual Loans	2,748	4,149
Unpaid Principal Balance Nonaccrual Loans	$ 2,937	$ 4,633