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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, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Recorded Investment of Loans Collectively Measured for Contingency Provision | $ 8,526,201 |  | $ 8,526,201 |  | $ 8,252,647
Recorded Investment of Loans Individually Measured for Specific Impairment | 36,059 |  | 36,059 |  | 49,104
Recorded Investment | 24,793 |  | 24,793 |  | 35,753
Unpaid Principal Balance | 29,513 |  | 29,513 |  | 40,716
Related Allowance | 1,475 |  | 1,475 |  | 2,132
Average Recorded Investment Impaired Loans | 45,672 | $ 72,157 | 46,815 | $ 71,173 |
Interest Recognized on Impaired Loans | 206 | 339 | 293 | 566 |
Secured Loans [Member] |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Recorded Investment of Loans Collectively Measured for Contingency Provision | 3,485,136 |  | 3,485,136 |  | 3,286,416
Recorded Investment of Loans Individually Measured for Specific Impairment | 17,259 |  | 17,259 |  | 26,285
Recorded Investment | 4,432 |  | 4,432 |  | 6,350
Unpaid Principal Balance | 5,661 |  | 5,661 |  | 8,460
Related Allowance | 740 |  | 740 |  | 2,023
Average Recorded Investment Impaired Loans | 23,733 | 45,716 | 24,584 | 43,815 |
Interest Recognized on Impaired Loans | 18 | 85 | 29 | 97 |
Unsecured Loans [Member] |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Recorded Investment of Loans Collectively Measured for Contingency Provision | 129,302 |  | 129,302 |  | 112,097
Recorded Investment of Loans Individually Measured for Specific Impairment | 16 |  | 16 |  | 20
Recorded Investment | 16 |  | 16 |  | 20
Unpaid Principal Balance | 16 |  | 16 |  | 20
Related Allowance | 0 |  | 0 |  | 0
Average Recorded Investment Impaired Loans | 18 | 444 | 18 | 304 |
Interest Recognized on Impaired Loans | 0 | 1 | 1 | 1 |
One-to-Four Family Residential [Member] |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Recorded Investment of Loans Collectively Measured for Contingency Provision | 277,873 |  | 277,873 |  | 235,138
Recorded Investment of Loans Individually Measured for Specific Impairment | 845 |  | 845 |  | 888
Recorded Investment | 315 |  | 315 |  | 325
Unpaid Principal Balance | 596 |  | 596 |  | 798
Related Allowance | 6 |  | 6 |  | 8
Average Recorded Investment Impaired Loans | 855 | 780 | 866 | 818 |
Interest Recognized on Impaired Loans | 12 | 12 | 18 | 18 |
Commercial Land [Member] |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Recorded Investment of Loans Collectively Measured for Contingency Provision | 289,277 |  | 289,277 |  | 283,451
Recorded Investment of Loans Individually Measured for Specific Impairment | 2,862 |  | 2,862 |  | 2,226
Recorded Investment | 2,233 |  | 2,233 |  | 0
Unpaid Principal Balance | 2,241 |  | 2,241 |  | 0
Related Allowance | 666 |  | 666 |  | 0
Average Recorded Investment Impaired Loans | 2,864 | 2,557 | 2,651 | 2,467 |
Interest Recognized on Impaired Loans | 8 | 0 | 15 | 0 |
Income Property Multifamily [Member] |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Recorded Investment of Loans Collectively Measured for Contingency Provision | 1,947,936 |  | 1,947,936 |  | 1,917,522
Recorded Investment of Loans Individually Measured for Specific Impairment | 1,329 |  | 1,329 |  | 2,954
Recorded Investment | 0 |  | 0 |  | 99
Unpaid Principal Balance | 0 |  | 0 |  | 165
Related Allowance | 0 |  | 0 |  | 1
Average Recorded Investment Impaired Loans | 1,325 | 2,846 | 1,868 | 3,572 |
Interest Recognized on Impaired Loans | 0 | 32 | 0 | 62 |
Owner Occupied [Member] |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Recorded Investment of Loans Collectively Measured for Contingency Provision | 1,641,023 |  | 1,641,023 |  | 1,605,042
Recorded Investment of Loans Individually Measured for Specific Impairment | 10,291 |  | 10,291 |  | 12,709
Recorded Investment | 3,129 |  | 3,129 |  | 3,231
Unpaid Principal Balance | 4,614 |  | 4,614 |  | 4,666
Related Allowance | 43 |  | 43 |  | 69
Average Recorded Investment Impaired Loans | 13,421 | 8,768 | 13,184 | 8,741 |
Interest Recognized on Impaired Loans | 147 | 124 | 193 | 209 |
Land And Acquisition [Member] |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Recorded Investment of Loans Collectively Measured for Contingency Provision | 1,683 |  | 1,683 |  | 4,417
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
Residential Construction [Member] |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Recorded Investment of Loans Collectively Measured for Contingency Provision | 199,154 |  | 199,154 |  | 212,396
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 | 605 | 0 | 807 |
Interest Recognized on Impaired Loans | 0 | 0 | 0 | 0 |
Income Property Multifamily Construction [Member] |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Recorded Investment of Loans Collectively Measured for Contingency Provision | 163,074 |  | 163,074 |  | 194,912
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, Credit Quality Indicator [Line Items] |  |  |  |  |
Recorded Investment of Loans Collectively Measured for Contingency Provision | 89,765 |  | 89,765 |  | 87,063
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 | 4,050 | 0 | 4,050 |
Interest Recognized on Impaired Loans | 0 | 51 | 0 | 102 |
Consumer Portfolio Segment [Member] |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Recorded Investment of Loans Collectively Measured for Contingency Provision | 301,978 |  | 301,978 |  | 314,193
Recorded Investment of Loans Individually Measured for Specific Impairment | 3,457 |  | 3,457 |  | 4,022
Recorded Investment | 1,141 |  | 1,141 |  | 3,326
Unpaid Principal Balance | 1,275 |  | 1,275 |  | 3,584
Related Allowance | 20 |  | 20 |  | 31
Average Recorded Investment Impaired Loans | 3,456 | 6,391 | 3,644 | 6,599 |
Interest Recognized on Impaired Loans | 21 | $ 34 | 37 | $ 77 |
Impaired Loans With Recorded Allowance [Member] |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Recorded Investment | 11,266 |  | 11,266 |  | 13,351
Unpaid Principal Balance | 14,403 |  | 14,403 |  | 17,693
Impaired Loans Without Recorded Allowance [Member] | Secured Loans [Member] |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Recorded Investment | 12,827 |  | 12,827 |  | 19,935
Unpaid Principal Balance | 16,997 |  | 16,997 |  | 24,404
Impaired Loans Without Recorded Allowance [Member] | Unsecured Loans [Member] |  |  |  |  |
Financing Receivable, Credit Quality Indicator [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, Credit Quality Indicator [Line Items] |  |  |  |  |
Recorded Investment | 530 |  | 530 |  | 563
Unpaid Principal Balance | 755 |  | 755 |  | 575
Impaired Loans Without Recorded Allowance [Member] | Commercial Land [Member] |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Recorded Investment | 629 |  | 629 |  | 2,226
Unpaid Principal Balance | 667 |  | 667 |  | 2,272
Impaired Loans Without Recorded Allowance [Member] | Income Property Multifamily [Member] |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Recorded Investment | 1,329 |  | 1,329 |  | 2,855
Unpaid Principal Balance | 1,362 |  | 1,362 |  | 3,011
Impaired Loans Without Recorded Allowance [Member] | Owner Occupied [Member] |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Recorded Investment | 7,162 |  | 7,162 |  | 9,478
Unpaid Principal Balance | 7,272 |  | 7,272 |  | 9,750
Impaired Loans Without Recorded Allowance [Member] | Land And Acquisition [Member] |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Recorded Investment | 0 |  | 0 |  | 0
Unpaid Principal Balance | 0 |  | 0 |  | 0
Impaired Loans Without Recorded Allowance [Member] | Residential Construction [Member] |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Recorded Investment | 0 |  | 0 |  | 0
Unpaid Principal Balance | 0 |  | 0 |  | 0
Impaired Loans Without Recorded Allowance [Member] | Income Property Multifamily Construction [Member] |  |  |  |  |
Financing Receivable, Credit Quality Indicator [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, Credit Quality Indicator [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, Credit Quality Indicator [Line Items] |  |  |  |  |
Recorded Investment | 2,316 |  | 2,316 |  | 696
Unpaid Principal Balance | $ 2,460 |  | $ 2,460 |  | $ 704

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