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Loans (Analysis of Impaired Loans) (Details) - Loans, Excluding Purchased Credit Impaired Loans [Member] - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment of Loans Collectively Measured for Contingency Provision | $ 5,927,172 |  | $ 5,927,172 |  | $ 5,618,041
Recorded Investment of Loans Individually Measured for Specific Impairment | 18,864 |  | 18,864 |  | 16,080
Recorded Investment | 12,959 |  | 12,959 |  | 14,726
Unpaid Principal Balance | 17,601 |  | 17,601 |  | 19,547
Related Allowance | 2,705 |  | 2,705 |  | 653
Average Recorded Investment Impaired Loans | 23,840 | $ 24,401 | 21,253 | $ 25,634 |
Interest Recognized on Impaired Loans | 48 | 280 | 74 | 545 |
Secured Loans [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment of Loans Collectively Measured for Contingency Provision | 2,410,385 |  | 2,410,385 |  | 2,257,168
Recorded Investment of Loans Individually Measured for Specific Impairment | 7,036 |  | 7,036 |  | 5,524
Recorded Investment | 3,320 |  | 3,320 |  | 690
Unpaid Principal Balance | 6,570 |  | 6,570 |  | 718
Related Allowance | 2,486 |  | 2,486 |  | 321
Average Recorded Investment Impaired Loans | 12,859 | 9,231 | 10,414 | 9,662 |
Interest Recognized on Impaired Loans | 20 | 8 | 33 | 15 |
Unsecured Loans [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment of Loans Collectively Measured for Contingency Provision | 96,890 |  | 96,890 |  | 94,948
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 | 1 |
Interest Recognized on Impaired Loans | 0 | 0 | 0 | 0 |
One-to-Four Family Residential [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment of Loans Collectively Measured for Contingency Provision | 169,484 |  | 169,484 |  | 172,150
Recorded Investment of Loans Individually Measured for Specific Impairment | 688 |  | 688 |  | 1,286
Recorded Investment | 89 |  | 89 |  | 314
Unpaid Principal Balance | 108 |  | 108 |  | 339
Related Allowance | 1 |  | 1 |  | 314
Average Recorded Investment Impaired Loans | 676 | 4,180 | 879 | 3,502 |
Interest Recognized on Impaired Loans | (3) | 11 | 3 | 24 |
Commercial Land [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment of Loans Collectively Measured for Contingency Provision | 233,499 |  | 233,499 |  | 213,158
Recorded Investment of Loans Individually Measured for Specific Impairment | 708 |  | 708 |  | 0
Recorded Investment | 0 |  | 0 |  | 0
Unpaid Principal Balance | 0 |  | 0 |  | 0
Related Allowance | 0 |  | 0 |  | 0
Average Recorded Investment Impaired Loans | 354 | 235 | 236 | 157 |
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 | 1,370,662 |  | 1,370,662 |  | 1,308,673
Recorded Investment of Loans Individually Measured for Specific Impairment | 1,445 |  | 1,445 |  | 2,106
Recorded Investment | 636 |  | 636 |  | 0
Unpaid Principal Balance | 687 |  | 687 |  | 0
Related Allowance | 100 |  | 100 |  | 0
Average Recorded Investment Impaired Loans | 1,749 | 1,966 | 1,868 | 3,427 |
Interest Recognized on Impaired Loans | 10 | 23 | 14 | 33 |
Owner Occupied [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment of Loans Collectively Measured for Contingency Provision | 1,019,219 |  | 1,019,219 |  | 940,261
Recorded Investment of Loans Individually Measured for Specific Impairment | 5,227 |  | 5,227 |  | 6,055
Recorded Investment | 0 |  | 0 |  | 0
Unpaid Principal Balance | 0 |  | 0 |  | 0
Related Allowance | 0 |  | 0 |  | 0
Average Recorded Investment Impaired Loans | 5,102 | 6,567 | 5,420 | 7,326 |
Interest Recognized on Impaired Loans | 0 | 235 | 0 | 468 |
Land And Acquisition [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment of Loans Collectively Measured for Contingency Provision | 10,605 |  | 10,605 |  | 14,283
Recorded Investment of Loans Individually Measured for Specific Impairment | 103 |  | 103 |  | 467
Recorded Investment | 0 |  | 0 |  | 0
Unpaid Principal Balance | 0 |  | 0 |  | 0
Related Allowance | 0 |  | 0 |  | 0
Average Recorded Investment Impaired Loans | 206 | 974 | 293 | 686 |
Interest Recognized on Impaired Loans | 1 | 2 | 3 | 3 |
Residential Construction [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment of Loans Collectively Measured for Contingency Provision | 117,302 |  | 117,302 |  | 119,813
Recorded Investment of Loans Individually Measured for Specific Impairment | 562 |  | 562 |  | 562
Recorded Investment | 0 |  | 0 |  | 335
Unpaid Principal Balance | 0 |  | 0 |  | 335
Related Allowance | 0 |  | 0 |  | 3
Average Recorded Investment Impaired Loans | 562 | 893 | 562 | 595 |
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 | 78,867 |  | 78,867 |  | 83,634
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 | 104,896 |  | 104,896 |  | 81,671
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 | 315,363 |  | 315,363 |  | 332,282
Recorded Investment of Loans Individually Measured for Specific Impairment | 3,095 |  | 3,095 |  | 80
Recorded Investment | 1,860 |  | 1,860 |  | 15
Unpaid Principal Balance | 1,870 |  | 1,870 |  | 15
Related Allowance | 118 |  | 118 |  | 15
Average Recorded Investment Impaired Loans | 2,332 | 355 | 1,581 | 278 |
Interest Recognized on Impaired Loans | 20 | $ 1 | 21 | $ 2 |
Impaired Loans With Recorded Allowance [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment | 5,905 |  | 5,905 |  | 1,354
Unpaid Principal Balance | 9,235 |  | 9,235 |  | 1,407
Impaired Loans Without Recorded Allowance [Member] | Secured Loans [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment | 3,716 |  | 3,716 |  | 4,834
Unpaid Principal Balance | 5,337 |  | 5,337 |  | 6,455
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 | 599 |  | 599 |  | 972
Unpaid Principal Balance | 1,011 |  | 1,011 |  | 1,397
Impaired Loans Without Recorded Allowance [Member] | Commercial Land [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment | 708 |  | 708 |  | 0
Unpaid Principal Balance | 687 |  | 687 |  | 0
Impaired Loans Without Recorded Allowance [Member] | Income Property Multifamily [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment | 809 |  | 809 |  | 2,106
Unpaid Principal Balance | 918 |  | 918 |  | 2,311
Impaired Loans Without Recorded Allowance [Member] | Owner Occupied [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment | 5,227 |  | 5,227 |  | 6,055
Unpaid Principal Balance | 7,664 |  | 7,664 |  | 8,528
Impaired Loans Without Recorded Allowance [Member] | Land And Acquisition [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment | 103 |  | 103 |  | 467
Unpaid Principal Balance | 103 |  | 103 |  | 490
Impaired Loans Without Recorded Allowance [Member] | Residential Construction [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment | 562 |  | 562 |  | 227
Unpaid Principal Balance | 562 |  | 562 |  | 227
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 | 1,235 |  | 1,235 |  | 65
Unpaid Principal Balance | $ 1,319 |  | $ 1,319 |  | $ 139

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