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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, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment of Loans Collectively Measured for Contingency Provision | $ 5,536,565 |  | $ 5,536,565 |  | $ 5,186,695
Recorded Investment of Loans Individually Measured for Specific Impairment | 18,880 |  | 18,880 |  | 28,099
Recorded Investment | 16,470 |  | 16,470 |  | 26,883
Unpaid Principal Balance | 21,257 |  | 21,257 |  | 38,433
Related Allowance | 1,199 |  | 1,199 |  | 241
Average Recorded Investment Impaired Loans | 20,293 | $ 26,000 | 23,946 | $ 26,269 |
Interest Recognized on Impaired Loans | 91 | 342 | 612 | 1,019 |
Secured Loans [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment of Loans Collectively Measured for Contingency Provision | 2,260,544 |  | 2,260,544 |  | 2,023,104
Recorded Investment of Loans Individually Measured for Specific Impairment | 5,424 |  | 5,424 |  | 10,524
Recorded Investment | 1,402 |  | 1,402 |  | 99
Unpaid Principal Balance | 1,412 |  | 1,412 |  | 99
Related Allowance | 1,020 |  | 1,020 |  | 25
Average Recorded Investment Impaired Loans | 6,507 | 6,869 | 8,602 | 6,550 |
Interest Recognized on Impaired Loans | 3 | 17 | 10 | 50 |
Unsecured Loans [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment of Loans Collectively Measured for Contingency Provision | 83,739 |  | 83,739 |  | 80,091
Recorded Investment of Loans Individually Measured for Specific Impairment | 0 |  | 0 |  | 2
Recorded Investment | 0 |  | 0 |  | 2
Unpaid Principal Balance | 0 |  | 0 |  | 2
Related Allowance | 0 |  | 0 |  | 2
Average Recorded Investment Impaired Loans | 0 | 15 | 1 | 23 |
Interest Recognized on Impaired Loans | 0 | 0 | 0 | 1 |
One-to-Four Family Residential [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment of Loans Collectively Measured for Contingency Provision | 171,669 |  | 171,669 |  | 169,619
Recorded Investment of Loans Individually Measured for Specific Impairment | 2,448 |  | 2,448 |  | 2,145
Recorded Investment | 317 |  | 317 |  | 424
Unpaid Principal Balance | 341 |  | 341 |  | 465
Related Allowance | 84 |  | 84 |  | 120
Average Recorded Investment Impaired Loans | 3,315 | 2,307 | 3,238 | 2,082 |
Interest Recognized on Impaired Loans | 11 | 14 | 35 | 37 |
Commercial Land [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment of Loans Collectively Measured for Contingency Provision | 208,412 |  | 208,412 |  | 189,779
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 | 94 | 118 | 102 |
Interest Recognized on Impaired Loans | 0 | 0 | 0 | 0 |
Income Property Multifamily [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment of Loans Collectively Measured for Contingency Provision | 1,320,287 |  | 1,320,287 |  | 1,295,650
Recorded Investment of Loans Individually Measured for Specific Impairment | 2,177 |  | 2,177 |  | 6,349
Recorded Investment | 0 |  | 0 |  | 0
Unpaid Principal Balance | 0 |  | 0 |  | 0
Related Allowance | 0 |  | 0 |  | 0
Average Recorded Investment Impaired Loans | 2,061 | 7,345 | 3,114 | 6,891 |
Interest Recognized on Impaired Loans | 10 | 69 | 27 | 205 |
Owner Occupied [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment of Loans Collectively Measured for Contingency Provision | 889,085 |  | 889,085 |  | 835,895
Recorded Investment of Loans Individually Measured for Specific Impairment | 7,229 |  | 7,229 |  | 8,846
Recorded Investment | 571 |  | 571 |  | 582
Unpaid Principal Balance | 571 |  | 571 |  | 582
Related Allowance | 17 |  | 17 |  | 27
Average Recorded Investment Impaired Loans | 6,665 | 9,117 | 7,302 | 9,629 |
Interest Recognized on Impaired Loans | 65 | 239 | 533 | 715 |
Land And Acquisition [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment of Loans Collectively Measured for Contingency Provision | 13,854 |  | 13,854 |  | 16,401
Recorded Investment of Loans Individually Measured for Specific Impairment | 681 |  | 681 |  | 109
Recorded Investment | 106 |  | 106 |  | 109
Unpaid Principal Balance | 106 |  | 106 |  | 109
Related Allowance | 64 |  | 64 |  | 67
Average Recorded Investment Impaired Loans | 825 | 111 | 685 | 840 |
Interest Recognized on Impaired Loans | 1 | 1 | 4 | 4 |
Residential Construction [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment of Loans Collectively Measured for Contingency Provision | 120,414 |  | 120,414 |  | 98,521
Recorded Investment of Loans Individually Measured for Specific Impairment | 893 |  | 893 |  | 0
Recorded Investment | 0 |  | 0 |  | 0
Unpaid Principal Balance | 0 |  | 0 |  | 0
Related Allowance | 0 |  | 0 |  | 0
Average Recorded Investment Impaired Loans | 893 | 0 | 670 | 0 |
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 | 63,182 |  | 63,182 |  | 73,783
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 | 69,243 |  | 69,243 |  | 58,944
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
Consumer Portfolio Segment [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment of Loans Collectively Measured for Contingency Provision | 336,136 |  | 336,136 |  | 344,908
Recorded Investment of Loans Individually Measured for Specific Impairment | 28 |  | 28 |  | 124
Recorded Investment | 14 |  | 14 |  | 0
Unpaid Principal Balance | 15 |  | 15 |  | 0
Related Allowance | 14 |  | 14 |  | 0
Average Recorded Investment Impaired Loans | 27 | 142 | 216 | 152 |
Interest Recognized on Impaired Loans | 1 | $ 2 | 3 | $ 7 |
Impaired Loans With Recorded Allowance [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment | 2,410 |  | 2,410 |  | 1,216
Unpaid Principal Balance | 2,445 |  | 2,445 |  | 1,257
Impaired Loans Without Recorded Allowance [Member] | Secured Loans [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment | 4,022 |  | 4,022 |  | 10,425
Unpaid Principal Balance | 5,312 |  | 5,312 |  | 12,410
Impaired Loans Without Recorded Allowance [Member] | Unsecured Loans [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment | 0 |  | 0 |  | 0
Unpaid Principal Balance | 0 |  | 0 |  | 0
Impaired Loans Without Recorded Allowance [Member] | One-to-Four Family Residential [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment | 2,131 |  | 2,131 |  | 1,721
Unpaid Principal Balance | 2,903 |  | 2,903 |  | 2,370
Impaired Loans Without Recorded Allowance [Member] | Commercial Land [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment | 0 |  | 0 |  | 0
Unpaid Principal Balance | 0 |  | 0 |  | 0
Impaired Loans Without Recorded Allowance [Member] | Income Property Multifamily [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment | 2,177 |  | 2,177 |  | 6,349
Unpaid Principal Balance | 2,336 |  | 2,336 |  | 10,720
Impaired Loans Without Recorded Allowance [Member] | Owner Occupied [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment | 6,658 |  | 6,658 |  | 8,264
Unpaid Principal Balance | 9,137 |  | 9,137 |  | 12,732
Impaired Loans Without Recorded Allowance [Member] | Land And Acquisition [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment | 575 |  | 575 |  | 0
Unpaid Principal Balance | 591 |  | 591 |  | 0
Impaired Loans Without Recorded Allowance [Member] | Residential Construction [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment | 893 |  | 893 |  | 0
Unpaid Principal Balance | 893 |  | 893 |  | 0
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 | 0 |  | 0 |  | 0
Unpaid Principal Balance | 0 |  | 0 |  | 0
Impaired Loans Without Recorded Allowance [Member] | Consumer Portfolio Segment [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment | 14 |  | 14 |  | 124
Unpaid Principal Balance | $ 85 |  | $ 85 |  | $ 201

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