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Loans (Analysis of Impaired Loans) (Details) - Loans, Excluding Purchased Credit Impaired Loans [Member] - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment of Loans Collectively Measured for Contingency Provision | $ 8,353,691 |  | $ 8,353,691 |  | $ 8,176,782
Recorded Investment of Loans Individually Measured for Specific Impairment | 64,690 |  | 64,690 |  | 69,205
Recorded Investment | 49,865 |  | 49,865 |  | 56,357
Unpaid Principal Balance | 55,431 |  | 55,431 |  | 64,735
Related Allowance | 1,255 |  | 1,255 |  | 2,360
Average Recorded Investment Impaired Loans | 68,528 | $ 42,623 | 69,552 | $ 33,508 |
Interest Recognized on Impaired Loans | 314 | 374 | 813 | 664 |
Secured Loans [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment of Loans Collectively Measured for Contingency Provision | 3,379,535 |  | 3,379,535 |  | 3,195,649
Recorded Investment of Loans Individually Measured for Specific Impairment | 40,776 |  | 40,776 |  | 40,012
Recorded Investment | 7,402 |  | 7,402 |  | 3,808
Unpaid Principal Balance | 7,875 |  | 7,875 |  | 3,937
Related Allowance | 1,139 |  | 1,139 |  | 1,867
Average Recorded Investment Impaired Loans | 43,805 | 22,395 | 43,055 | 15,349 |
Interest Recognized on Impaired Loans | 2 | 2 | 43 | 25 |
Unsecured Loans [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment of Loans Collectively Measured for Contingency Provision | 118,897 |  | 118,897 |  | 124,150
Recorded Investment of Loans Individually Measured for Specific Impairment | 22 |  | 22 |  | 25
Recorded Investment | 0 |  | 0 |  | 25
Unpaid Principal Balance | 0 |  | 0 |  | 24
Related Allowance | 0 |  | 0 |  | 3
Average Recorded Investment Impaired Loans | 444 | 0 | 234 | 0 |
Interest Recognized on Impaired Loans | 0 | 0 | 1 | 0 |
One-to-Four Family Residential [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment of Loans Collectively Measured for Contingency Provision | 230,915 |  | 230,915 |  | 185,659
Recorded Investment of Loans Individually Measured for Specific Impairment | 396 |  | 396 |  | 895
Recorded Investment | 337 |  | 337 |  | 867
Unpaid Principal Balance | 606 |  | 606 |  | 1,408
Related Allowance | 8 |  | 8 |  | 103
Average Recorded Investment Impaired Loans | 545 | 856 | 713 | 688 |
Interest Recognized on Impaired Loans | 12 | 15 | 30 | 37 |
Commercial Land [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment of Loans Collectively Measured for Contingency Provision | 279,008 |  | 279,008 |  | 293,694
Recorded Investment of Loans Individually Measured for Specific Impairment | 2,230 |  | 2,230 |  | 2,287
Recorded Investment | 0 |  | 0 |  | 0
Unpaid Principal Balance | 0 |  | 0 |  | 0
Related Allowance | 0 |  | 0 |  | 0
Average Recorded Investment Impaired Loans | 2,246 | 2,549 | 2,407 | 2,026 |
Interest Recognized on Impaired Loans | 26 | 0 | 26 | 0 |
Income Property Multifamily [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment of Loans Collectively Measured for Contingency Provision | 1,884,936 |  | 1,884,936 |  | 1,901,313
Recorded Investment of Loans Individually Measured for Specific Impairment | 2,754 |  | 2,754 |  | 5,023
Recorded Investment | 110 |  | 110 |  | 2,768
Unpaid Principal Balance | 175 |  | 175 |  | 3,328
Related Allowance | 1 |  | 1 |  | 185
Average Recorded Investment Impaired Loans | 2,443 | 4,214 | 3,367 | 4,137 |
Interest Recognized on Impaired Loans | 34 | 21 | 96 | 27 |
Owner Occupied [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment of Loans Collectively Measured for Contingency Provision | 1,587,550 |  | 1,587,550 |  | 1,591,298
Recorded Investment of Loans Individually Measured for Specific Impairment | 9,719 |  | 9,719 |  | 8,688
Recorded Investment | 3,274 |  | 3,274 |  | 77
Unpaid Principal Balance | 4,693 |  | 4,693 |  | 80
Related Allowance | 71 |  | 71 |  | 3
Average Recorded Investment Impaired Loans | 9,349 | 4,530 | 8,986 | 4,496 |
Interest Recognized on Impaired Loans | 124 | 127 | 333 | 319 |
Land And Acquisition [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment of Loans Collectively Measured for Contingency Provision | 5,963 |  | 5,963 |  | 9,907
Recorded Investment of Loans Individually Measured for Specific Impairment | 0 |  | 0 |  | 0
Recorded Investment | 0 |  | 0 |  | 0
Unpaid Principal Balance | 0 |  | 0 |  | 0
Related Allowance | 0 |  | 0 |  | 0
Average Recorded Investment Impaired Loans | 0 | 0 | 0 | 4 |
Interest Recognized on Impaired Loans | 0 | 0 | 0 | 0 |
Residential Construction [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment of Loans Collectively Measured for Contingency Provision | 204,628 |  | 204,628 |  | 188,481
Recorded Investment of Loans Individually Measured for Specific Impairment | 0 |  | 0 |  | 1,210
Recorded Investment | 0 |  | 0 |  | 0
Unpaid Principal Balance | 0 |  | 0 |  | 0
Related Allowance | 0 |  | 0 |  | 0
Average Recorded Investment Impaired Loans | 0 | 0 | 605 | 84 |
Interest Recognized on Impaired Loans | 0 | 0 | 0 | 0 |
Income Property Multifamily Construction [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment of Loans Collectively Measured for Contingency Provision | 253,636 |  | 253,636 |  | 293,028
Recorded Investment of Loans Individually Measured for Specific Impairment | 0 |  | 0 |  | 0
Recorded Investment | 0 |  | 0 |  | 0
Unpaid Principal Balance | 0 |  | 0 |  | 0
Related Allowance | 0 |  | 0 |  | 0
Owner Occupied Construction [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment of Loans Collectively Measured for Contingency Provision | 86,461 |  | 86,461 |  | 68,393
Recorded Investment of Loans Individually Measured for Specific Impairment | 4,050 |  | 4,050 |  | 4,050
Recorded Investment | 0 |  | 0 |  | 0
Unpaid Principal Balance | 0 |  | 0 |  | 0
Related Allowance | 0 |  | 0 |  | 0
Average Recorded Investment Impaired Loans | 4,050 | 2,025 | 4,050 | 1,012 |
Interest Recognized on Impaired Loans | 72 | 151 | 174 | 151 |
Consumer Portfolio Segment [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment of Loans Collectively Measured for Contingency Provision | 322,162 |  | 322,162 |  | 325,210
Recorded Investment of Loans Individually Measured for Specific Impairment | 4,743 |  | 4,743 |  | 7,015
Recorded Investment | 3,702 |  | 3,702 |  | 5,303
Unpaid Principal Balance | 3,953 |  | 3,953 |  | 5,568
Related Allowance | 36 |  | 36 |  | 199
Average Recorded Investment Impaired Loans | 5,646 | 6,054 | 6,135 | 5,712 |
Interest Recognized on Impaired Loans | 44 | $ 58 | 110 | $ 105 |
Impaired Loans With Recorded Allowance [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment | 14,825 |  | 14,825 |  | 12,848
Unpaid Principal Balance | 17,302 |  | 17,302 |  | 14,345
Impaired Loans Without Recorded Allowance [Member] | Secured Loans [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment | 33,374 |  | 33,374 |  | 36,204
Unpaid Principal Balance | 38,293 |  | 38,293 |  | 42,314
Impaired Loans Without Recorded Allowance [Member] | Unsecured Loans [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment | 22 |  | 22 |  | 0
Unpaid Principal Balance | 21 |  | 21 |  | 0
Impaired Loans Without Recorded Allowance [Member] | One-to-Four Family Residential [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment | 59 |  | 59 |  | 28
Unpaid Principal Balance | 256 |  | 256 |  | 337
Impaired Loans Without Recorded Allowance [Member] | Commercial Land [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment | 2,230 |  | 2,230 |  | 2,287
Unpaid Principal Balance | 2,274 |  | 2,274 |  | 2,282
Impaired Loans Without Recorded Allowance [Member] | Income Property Multifamily [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment | 2,644 |  | 2,644 |  | 2,255
Unpaid Principal Balance | 2,789 |  | 2,789 |  | 2,601
Impaired Loans Without Recorded Allowance [Member] | Owner Occupied [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment | 6,445 |  | 6,445 |  | 8,611
Unpaid Principal Balance | 6,692 |  | 6,692 |  | 10,077
Impaired Loans Without Recorded Allowance [Member] | Land And Acquisition [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment | 0 |  | 0 |  | 0
Unpaid Principal Balance | 0 |  | 0 |  | 0
Impaired Loans Without Recorded Allowance [Member] | Residential Construction [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment | 0 |  | 0 |  | 1,210
Unpaid Principal Balance | 0 |  | 0 |  | 1,210
Impaired Loans Without Recorded Allowance [Member] | Income Property Multifamily Construction [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment | 0 |  | 0 |  | 0
Unpaid Principal Balance | 0 |  | 0 |  | 0
Impaired Loans Without Recorded Allowance [Member] | Owner Occupied Construction [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment | 4,050 |  | 4,050 |  | 4,050
Unpaid Principal Balance | 4,050 |  | 4,050 |  | 4,050
Impaired Loans Without Recorded Allowance [Member] | Consumer Portfolio Segment [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment | 1,041 |  | 1,041 |  | 1,712
Unpaid Principal Balance | $ 1,056 |  | $ 1,056 |  | $ 1,864

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