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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, 2016 | Mar. 31, 2015 | Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items] |  |  |
Recorded Investment of Loans Collectively Measured for Contingency Provision | $ 5,675,267 |  | $ 5,618,041
Recorded Investment of Loans Individually Measured for Specific Impairment | 28,815 |  | 16,080
Recorded Investment | 16,939 |  | 14,726
Unpaid Principal Balance | 25,584 |  | 19,547
Related Allowance | 2,515 |  | 653
Average Recorded Investment Impaired Loans | 22,448 | $ 27,596 |
Interest Recognized on Impaired Loans | 36 | 267 |
Secured Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Recorded Investment of Loans Collectively Measured for Contingency Provision | 2,285,351 |  | 2,257,168
Recorded Investment of Loans Individually Measured for Specific Impairment | 18,681 |  | 5,524
Recorded Investment | 11,861 |  | 690
Unpaid Principal Balance | 11,996 |  | 718
Related Allowance | 2,500 |  | 321
Average Recorded Investment Impaired Loans | 12,103 | 10,698 |
Interest Recognized on Impaired Loans | 17 | 7 |
Unsecured Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Recorded Investment of Loans Collectively Measured for Contingency Provision | 92,576 |  | 94,948
Recorded Investment of Loans Individually Measured for Specific Impairment | 0 |  | 0
Recorded Investment | 0 |  | 0
Unpaid Principal Balance | 0 |  | 0
Related Allowance | 0 |  | 0
Average Recorded Investment Impaired Loans | 0 | 1 |
Interest Recognized on Impaired Loans | 0 | 0 |
One-to-Four Family Residential [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Recorded Investment of Loans Collectively Measured for Contingency Provision | 171,660 |  | 172,150
Recorded Investment of Loans Individually Measured for Specific Impairment | 664 |  | 1,286
Recorded Investment | 0 |  | 314
Unpaid Principal Balance | 0 |  | 339
Related Allowance | 0 |  | 314
Average Recorded Investment Impaired Loans | 975 | 3,162 |
Interest Recognized on Impaired Loans | 6 | 13 |
Commercial Land [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Recorded Investment of Loans Collectively Measured for Contingency Provision | 219,163 |  | 213,158
Recorded Investment of Loans Individually Measured for Specific Impairment | 0 |  | 0
Recorded Investment | 0 |  | 0
Unpaid Principal Balance | 0 |  | 0
Related Allowance | 0 |  | 0
Average Recorded Investment Impaired Loans | 0 | 235 |
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 | 1,322,410 |  | 1,308,673
Recorded Investment of Loans Individually Measured for Specific Impairment | 2,053 |  | 2,106
Recorded Investment | 0 |  | 0
Unpaid Principal Balance | 0 |  | 0
Related Allowance | 0 |  | 0
Average Recorded Investment Impaired Loans | 2,080 | 4,168 |
Interest Recognized on Impaired Loans | 3 | 10 |
Owner Occupied [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Recorded Investment of Loans Collectively Measured for Contingency Provision | 951,216 |  | 940,261
Recorded Investment of Loans Individually Measured for Specific Impairment | 4,978 |  | 6,055
Recorded Investment | 0 |  | 0
Unpaid Principal Balance | 0 |  | 0
Related Allowance | 0 |  | 0
Average Recorded Investment Impaired Loans | 5,516 | 7,938 |
Interest Recognized on Impaired Loans | 7 | 234 |
Land And Acquisition [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Recorded Investment of Loans Collectively Measured for Contingency Provision | 12,810 |  | 14,283
Recorded Investment of Loans Individually Measured for Specific Impairment | 310 |  | 467
Recorded Investment | 0 |  | 0
Unpaid Principal Balance | 0 |  | 0
Related Allowance | 0 |  | 0
Average Recorded Investment Impaired Loans | 388 | 544 |
Interest Recognized on Impaired Loans | 1 | 1 |
Residential Construction [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Recorded Investment of Loans Collectively Measured for Contingency Provision | 119,126 |  | 119,813
Recorded Investment of Loans Individually Measured for Specific Impairment | 562 |  | 562
Recorded Investment | 0 |  | 335
Unpaid Principal Balance | 0 |  | 335
Related Allowance | 0 |  | 3
Average Recorded Investment Impaired Loans | 562 | 446 |
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 | 86,584 |  | 83,634
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 | 94,743 |  | 81,671
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 | 319,628 |  | 332,282
Recorded Investment of Loans Individually Measured for Specific Impairment | 1,567 |  | 80
Recorded Investment | 15 |  | 15
Unpaid Principal Balance | 15 |  | 15
Related Allowance | 15 |  | 15
Average Recorded Investment Impaired Loans | 824 | 404 |
Interest Recognized on Impaired Loans | 2 | $ 2 |
Impaired Loans With Recorded Allowance [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Recorded Investment | 11,876 |  | 1,354
Unpaid Principal Balance | 12,011 |  | 1,407
Impaired Loans Without Recorded Allowance [Member] | Secured Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Recorded Investment | 6,820 |  | 4,834
Unpaid Principal Balance | 12,314 |  | 6,455
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 | 664 |  | 972
Unpaid Principal Balance | 1,093 |  | 1,397
Impaired Loans Without Recorded Allowance [Member] | Commercial Land [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Recorded Investment | 0 |  | 0
Unpaid Principal Balance | 0 |  | 0
Impaired Loans Without Recorded Allowance [Member] | Income Property Multifamily [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Recorded Investment | 2,053 |  | 2,106
Unpaid Principal Balance | 2,257 |  | 2,311
Impaired Loans Without Recorded Allowance [Member] | Owner Occupied [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Recorded Investment | 4,978 |  | 6,055
Unpaid Principal Balance | 7,390 |  | 8,528
Impaired Loans Without Recorded Allowance [Member] | Land And Acquisition [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Recorded Investment | 310 |  | 467
Unpaid Principal Balance | 334 |  | 490
Impaired Loans Without Recorded Allowance [Member] | Residential Construction [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Recorded Investment | 562 |  | 227
Unpaid Principal Balance | 562 |  | 227
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 | 1,552 |  | 65
Unpaid Principal Balance | $ 1,634 |  | $ 139

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