Loans (Analysis of Nonaccrual Loans) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment Nonaccrual Loans	$ 78,464	$ 66,189
Unpaid Principal Balance Nonaccrual Loans	91,271	79,886
Secured Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment Nonaccrual Loans	57,504	45,410
Unpaid Principal Balance Nonaccrual Loans	69,056	56,865
Unsecured Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment Nonaccrual Loans	115	50
Unpaid Principal Balance Nonaccrual Loans	115	49
One-to-Four Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment Nonaccrual Loans	1,054	785
Unpaid Principal Balance Nonaccrual Loans	1,426	1,182
Commercial Land [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment Nonaccrual Loans	3,192	2,628
Unpaid Principal Balance Nonaccrual Loans	3,201	2,623
Income Property Multifamily [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment Nonaccrual Loans	3,980	4,284
Unpaid Principal Balance Nonaccrual Loans	4,264	5,410
Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment Nonaccrual Loans	7,367	7,029
Unpaid Principal Balance Nonaccrual Loans	7,621	7,270
Land And Acquisition [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment Nonaccrual Loans	0	25
Unpaid Principal Balance Nonaccrual Loans	0	26
Residential Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment Nonaccrual Loans	1,210	1,829
Unpaid Principal Balance Nonaccrual Loans	1,210	1,828
Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment Nonaccrual Loans	4,042	4,149
Unpaid Principal Balance Nonaccrual Loans	$ 4,378	$ 4,633