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Loans (Analysis of Impaired Loans) (Details) - Loans, Excluding Purchased Credit Impaired Loans [Member] - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items] |  |  |
Recorded Investment of Loans Collectively Measured for Contingency Provision | $ 6,065,903 |  | $ 6,042,304
Recorded Investment of Loans Individually Measured for Specific Impairment | 23,329 |  | 25,459
Recorded Investment | 17,449 |  | 17,592
Unpaid Principal Balance | 28,046 |  | 27,228
Related Allowance | 94 |  | 761
Average Recorded Investment Impaired Loans | 24,394 | $ 22,448 |
Interest Recognized on Impaired Loans | 49 | 36 |
Secured Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Recorded Investment of Loans Collectively Measured for Contingency Provision | 2,456,672 |  | 2,442,772
Recorded Investment of Loans Individually Measured for Specific Impairment | 7,788 |  | 8,818
Recorded Investment | 0 |  | 2,414
Unpaid Principal Balance | 0 |  | 2,484
Related Allowance | 0 |  | 664
Average Recorded Investment Impaired Loans | 8,303 | 12,103 |
Interest Recognized on Impaired Loans | 19 | 17 |
Unsecured Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Recorded Investment of Loans Collectively Measured for Contingency Provision | 90,473 |  | 94,737
Recorded Investment of Loans Individually Measured for Specific Impairment | 0 |  | 0
Recorded Investment | 0 |  | 0
Unpaid Principal Balance | 0 |  | 0
Related Allowance | 0 |  | 0
One-to-Four Family Residential [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Recorded Investment of Loans Collectively Measured for Contingency Provision | 169,686 |  | 167,403
Recorded Investment of Loans Individually Measured for Specific Impairment | 513 |  | 529
Recorded Investment | 424 |  | 435
Unpaid Principal Balance | 688 |  | 693
Related Allowance | 11 |  | 12
Average Recorded Investment Impaired Loans | 521 | 975 |
Interest Recognized on Impaired Loans | 2 | 6 |
Commercial Land [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Recorded Investment of Loans Collectively Measured for Contingency Provision | 280,992 |  | 270,106
Recorded Investment of Loans Individually Measured for Specific Impairment | 2,299 |  | 708
Recorded Investment | 0 |  | 0
Unpaid Principal Balance | 0 |  | 0
Related Allowance | 0 |  | 0
Average Recorded Investment Impaired Loans | 1,504 | 0 |
Interest Recognized on Impaired Loans | 0 | 0 |
Income Property Multifamily [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Recorded Investment of Loans Collectively Measured for Contingency Provision | 1,366,381 |  | 1,365,321
Recorded Investment of Loans Individually Measured for Specific Impairment | 3,694 |  | 4,425
Recorded Investment | 533 |  | 540
Unpaid Principal Balance | 537 |  | 544
Related Allowance | 26 |  | 27
Average Recorded Investment Impaired Loans | 4,059 | 2,080 |
Interest Recognized on Impaired Loans | 1 | 3 |
Owner Occupied [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Recorded Investment of Loans Collectively Measured for Contingency Provision | 1,107,814 |  | 1,054,564
Recorded Investment of Loans Individually Measured for Specific Impairment | 3,510 |  | 5,414
Recorded Investment | 0 |  | 0
Unpaid Principal Balance | 0 |  | 0
Related Allowance | 0 |  | 0
Average Recorded Investment Impaired Loans | 4,462 | 5,516 |
Interest Recognized on Impaired Loans | 0 | 7 |
Land And Acquisition [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Recorded Investment of Loans Collectively Measured for Contingency Provision | 6,799 |  | 11,542
Recorded Investment of Loans Individually Measured for Specific Impairment | 0 |  | 14
Recorded Investment | 0 |  | 14
Unpaid Principal Balance | 0 |  | 102
Related Allowance | 0 |  | 1
Average Recorded Investment Impaired Loans | 7 | 388 |
Interest Recognized on Impaired Loans | 0 | 1 |
Residential Construction [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Recorded Investment of Loans Collectively Measured for Contingency Provision | 107,784 |  | 109,293
Recorded Investment of Loans Individually Measured for Specific Impairment | 0 |  | 336
Recorded Investment | 0 |  | 0
Unpaid Principal Balance | 0 |  | 0
Related Allowance | 0 |  | 0
Average Recorded Investment Impaired Loans | 168 | 562 |
Interest Recognized on Impaired Loans | 0 | 0 |
Income Property Multifamily Construction [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Recorded Investment of Loans Collectively Measured for Contingency Provision | 106,227 |  | 103,779
Recorded Investment of Loans Individually Measured for Specific Impairment | 0 |  | 0
Recorded Investment | 0 |  | 0
Unpaid Principal Balance | 0 |  | 0
Related Allowance | 0 |  | 0
Owner Occupied Construction [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Recorded Investment of Loans Collectively Measured for Contingency Provision | 64,365 |  | 103,480
Recorded Investment of Loans Individually Measured for Specific Impairment | 0 |  | 0
Recorded Investment | 0 |  | 0
Unpaid Principal Balance | 0 |  | 0
Related Allowance | 0 |  | 0
Consumer Portfolio Segment [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Recorded Investment of Loans Collectively Measured for Contingency Provision | 308,710 |  | 319,307
Recorded Investment of Loans Individually Measured for Specific Impairment | 5,525 |  | 5,215
Recorded Investment | 4,923 |  | 4,464
Unpaid Principal Balance | 5,013 |  | 4,558
Related Allowance | 57 |  | 57
Average Recorded Investment Impaired Loans | 5,370 | 824 |
Interest Recognized on Impaired Loans | 27 | $ 2 |
Impaired Loans With Recorded Allowance [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Recorded Investment | 5,880 |  | 7,867
Unpaid Principal Balance | 6,238 |  | 8,381
Impaired Loans Without Recorded Allowance [Member] | Secured Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Recorded Investment | 7,788 |  | 6,404
Unpaid Principal Balance | 14,806 |  | 12,831
Impaired Loans Without Recorded Allowance [Member] | Unsecured Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Recorded Investment | 0 |  | 0
Unpaid Principal Balance | 0 |  | 0
Impaired Loans Without Recorded Allowance [Member] | One-to-Four Family Residential [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Recorded Investment | 89 |  | 94
Unpaid Principal Balance | 287 |  | 291
Impaired Loans Without Recorded Allowance [Member] | Commercial Land [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Recorded Investment | 2,299 |  | 708
Unpaid Principal Balance | 2,288 |  | 687
Impaired Loans Without Recorded Allowance [Member] | Income Property Multifamily [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Recorded Investment | 3,161 |  | 3,885
Unpaid Principal Balance | 3,656 |  | 4,148
Impaired Loans Without Recorded Allowance [Member] | Owner Occupied [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Recorded Investment | 3,510 |  | 5,414
Unpaid Principal Balance | 6,327 |  | 8,102
Impaired Loans Without Recorded Allowance [Member] | Land And Acquisition [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Recorded Investment | 0 |  | 0
Unpaid Principal Balance | 0 |  | 0
Impaired Loans Without Recorded Allowance [Member] | Residential Construction [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Recorded Investment | 0 |  | 336
Unpaid Principal Balance | 0 |  | 336
Impaired Loans Without Recorded Allowance [Member] | Income Property Multifamily Construction [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Recorded Investment | 0 |  | 0
Unpaid Principal Balance | 0 |  | 0
Impaired Loans Without Recorded Allowance [Member] | Owner Occupied Construction [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Recorded Investment | 0 |  | 0
Unpaid Principal Balance | 0 |  | 0
Impaired Loans Without Recorded Allowance [Member] | Consumer Portfolio Segment [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Recorded Investment | 602 |  | 751
Unpaid Principal Balance | $ 682 |  | $ 833

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