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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, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Financing Receivable, Recorded Investment [Line Items] |  |  |
Recorded Investment of Loans Collectively Measured for Contingency Provision | $ 8,377,258 |  | $ 8,252,647
Recorded Investment of Loans Individually Measured for Specific Impairment | 55,283 |  | 49,104
Recorded Investment | 43,805 |  | 35,753
Unpaid Principal Balance | 50,113 |  | 40,716
Related Allowance | 2,911 |  | 2,132
Average Recorded Investment Impaired Loans | 52,193 | $ 70,577 |
Interest Recognized on Impaired Loans | 189 | 239 |
Secured Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Recorded Investment of Loans Collectively Measured for Contingency Provision | 3,351,027 |  | 3,286,416
Recorded Investment of Loans Individually Measured for Specific Impairment | 30,207 |  | 26,285
Recorded Investment | 5,426 |  | 6,350
Unpaid Principal Balance | 6,189 |  | 8,460
Related Allowance | 2,829 |  | 2,023
Average Recorded Investment Impaired Loans | 28,246 | 42,306 |
Interest Recognized on Impaired Loans | 12 | 12 |
Unsecured Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Recorded Investment of Loans Collectively Measured for Contingency Provision | 115,199 |  | 112,097
Recorded Investment of Loans Individually Measured for Specific Impairment | 18 |  | 20
Recorded Investment | 0 |  | 20
Unpaid Principal Balance | 0 |  | 20
Related Allowance | 0 |  | 0
Average Recorded Investment Impaired Loans | 19 | 24 |
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 | 281,466 |  | 235,138
Recorded Investment of Loans Individually Measured for Specific Impairment | 864 |  | 888
Recorded Investment | 313 |  | 325
Unpaid Principal Balance | 793 |  | 798
Related Allowance | 8 |  | 8
Average Recorded Investment Impaired Loans | 876 | 881 |
Interest Recognized on Impaired Loans | 6 | 7 |
Commercial Land [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Recorded Investment of Loans Collectively Measured for Contingency Provision | 292,055 |  | 283,451
Recorded Investment of Loans Individually Measured for Specific Impairment | 2,865 |  | 2,226
Recorded Investment | 0 |  | 0
Unpaid Principal Balance | 0 |  | 0
Related Allowance | 0 |  | 0
Average Recorded Investment Impaired Loans | 2,546 | 2,569 |
Interest Recognized on Impaired Loans | 7 | 0 |
Income Property Multifamily [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Recorded Investment of Loans Collectively Measured for Contingency Provision | 1,961,287 |  | 1,917,522
Recorded Investment of Loans Individually Measured for Specific Impairment | 1,322 |  | 2,954
Recorded Investment | 0 |  | 99
Unpaid Principal Balance | 0 |  | 165
Related Allowance | 0 |  | 1
Average Recorded Investment Impaired Loans | 2,138 | 4,292 |
Interest Recognized on Impaired Loans | 19 | 31 |
Owner Occupied [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Recorded Investment of Loans Collectively Measured for Contingency Provision | 1,622,007 |  | 1,605,042
Recorded Investment of Loans Individually Measured for Specific Impairment | 16,552 |  | 12,709
Recorded Investment | 3,181 |  | 3,231
Unpaid Principal Balance | 4,640 |  | 4,666
Related Allowance | 52 |  | 69
Average Recorded Investment Impaired Loans | 14,630 | 8,622 |
Interest Recognized on Impaired Loans | 118 | 84 |
Land And Acquisition [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Recorded Investment of Loans Collectively Measured for Contingency Provision | 3,619 |  | 4,417
Recorded Investment of Loans Individually Measured for Specific Impairment | 0 |  | 0
Recorded Investment | 0 |  | 0
Unpaid Principal Balance | 0 |  | 0
Related Allowance | 0 |  | 0
Residential Construction [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Recorded Investment of Loans Collectively Measured for Contingency Provision | 203,318 |  | 212,396
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 | 1,210 |
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 | 163,674 |  | 194,912
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 | 74,736 |  | 87,063
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 | 4,050 |
Interest Recognized on Impaired Loans | 0 | 51 |
Consumer Portfolio Segment [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Recorded Investment of Loans Collectively Measured for Contingency Provision | 308,870 |  | 314,193
Recorded Investment of Loans Individually Measured for Specific Impairment | 3,455 |  | 4,022
Recorded Investment | 2,558 |  | 3,326
Unpaid Principal Balance | 2,703 |  | 3,584
Related Allowance | 22 |  | 31
Average Recorded Investment Impaired Loans | 3,738 | 6,623 |
Interest Recognized on Impaired Loans | 27 | $ 54 |
Impaired Loans With Recorded Allowance [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Recorded Investment | 11,478 |  | 13,351
Unpaid Principal Balance | 14,325 |  | 17,693
Impaired Loans Without Recorded Allowance [Member] | Secured Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Recorded Investment | 24,781 |  | 19,935
Unpaid Principal Balance | 30,656 |  | 24,404
Impaired Loans Without Recorded Allowance [Member] | Unsecured Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Recorded Investment | 18 |  | 0
Unpaid Principal Balance | 18 |  | 0
Impaired Loans Without Recorded Allowance [Member] | One-to-Four Family Residential [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Recorded Investment | 551 |  | 563
Unpaid Principal Balance | 568 |  | 575
Impaired Loans Without Recorded Allowance [Member] | Commercial Land [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Recorded Investment | 2,865 |  | 2,226
Unpaid Principal Balance | 2,909 |  | 2,272
Impaired Loans Without Recorded Allowance [Member] | Income Property Multifamily [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Recorded Investment | 1,322 |  | 2,855
Unpaid Principal Balance | 1,333 |  | 3,011
Impaired Loans Without Recorded Allowance [Member] | Owner Occupied [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Recorded Investment | 13,371 |  | 9,478
Unpaid Principal Balance | 13,617 |  | 9,750
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 |  | 0
Unpaid Principal Balance | 0 |  | 0
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 | 897 |  | 696
Unpaid Principal Balance | $ 1,012 |  | $ 704

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