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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, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Recorded Investment of Loans Collectively Measured for Contingency Provision | $ 8,633,361 |  | $ 8,633,361 |  | $ 8,252,647
Recorded Investment of Loans Individually Measured for Specific Impairment | 41,217 |  | 41,217 |  | 49,104
Recorded Investment | 26,040 |  | 26,040 |  | 35,753
Unpaid Principal Balance | 30,960 |  | 30,960 |  | 40,716
Related Allowance | 2,326 |  | 2,326 |  | 2,132
Average Recorded Investment Impaired Loans | 38,638 | $ 68,528 | 45,416 | $ 69,552 |
Interest Recognized on Impaired Loans | 314 | 314 | 558 | 813 |
Secured Loans [Member] |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Recorded Investment of Loans Collectively Measured for Contingency Provision | 3,530,404 |  | 3,530,404 |  | 3,286,416
Recorded Investment of Loans Individually Measured for Specific Impairment | 25,579 |  | 25,579 |  | 26,285
Recorded Investment | 9,114 |  | 9,114 |  | 6,350
Unpaid Principal Balance | 10,673 |  | 10,673 |  | 8,460
Related Allowance | 1,879 |  | 1,879 |  | 2,023
Average Recorded Investment Impaired Loans | 21,419 | 43,805 | 24,833 | 43,055 |
Interest Recognized on Impaired Loans | 108 | 2 | 267 | 43 |
Unsecured Loans [Member] |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Recorded Investment of Loans Collectively Measured for Contingency Provision | 139,360 |  | 139,360 |  | 112,097
Recorded Investment of Loans Individually Measured for Specific Impairment | 13 |  | 13 |  | 20
Recorded Investment | 13 |  | 13 |  | 20
Unpaid Principal Balance | 13 |  | 13 |  | 20
Related Allowance | 0 |  | 0 |  | 0
Average Recorded Investment Impaired Loans | 15 | 444 | 17 | 234 |
Interest Recognized on Impaired Loans | 0 | 0 | 1 | 1 |
One-to-Four Family Residential [Member] |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Recorded Investment of Loans Collectively Measured for Contingency Provision | 272,686 |  | 272,686 |  | 235,138
Recorded Investment of Loans Individually Measured for Specific Impairment | 347 |  | 347 |  | 888
Recorded Investment | 347 |  | 347 |  | 325
Unpaid Principal Balance | 635 |  | 635 |  | 798
Related Allowance | 5 |  | 5 |  | 8
Average Recorded Investment Impaired Loans | 596 | 545 | 736 | 713 |
Interest Recognized on Impaired Loans | 12 | 12 | 29 | 30 |
Commercial Land [Member] |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Recorded Investment of Loans Collectively Measured for Contingency Provision | 292,436 |  | 292,436 |  | 283,451
Recorded Investment of Loans Individually Measured for Specific Impairment | 2,860 |  | 2,860 |  | 2,226
Recorded Investment | 1,591 |  | 1,591 |  | 0
Unpaid Principal Balance | 1,601 |  | 1,601 |  | 0
Related Allowance | 320 |  | 320 |  | 0
Average Recorded Investment Impaired Loans | 2,861 | 2,246 | 2,704 | 2,407 |
Interest Recognized on Impaired Loans | 8 | 26 | 23 | 26 |
Income Property Multifamily [Member] |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Recorded Investment of Loans Collectively Measured for Contingency Provision | 1,961,935 |  | 1,961,935 |  | 1,917,522
Recorded Investment of Loans Individually Measured for Specific Impairment | 0 |  | 0 |  | 2,954
Recorded Investment | 0 |  | 0 |  | 99
Unpaid Principal Balance | 0 |  | 0 |  | 165
Related Allowance | 0 |  | 0 |  | 1
Average Recorded Investment Impaired Loans | 664 | 2,443 | 1,401 | 3,367 |
Interest Recognized on Impaired Loans | 0 | 34 | 0 | 96 |
Owner Occupied [Member] |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Recorded Investment of Loans Collectively Measured for Contingency Provision | 1,688,118 |  | 1,688,118 |  | 1,605,042
Recorded Investment of Loans Individually Measured for Specific Impairment | 10,190 |  | 10,190 |  | 12,709
Recorded Investment | 3,733 |  | 3,733 |  | 3,231
Unpaid Principal Balance | 5,260 |  | 5,260 |  | 4,666
Related Allowance | 105 |  | 105 |  | 69
Average Recorded Investment Impaired Loans | 10,241 | 9,349 | 12,435 | 8,986 |
Interest Recognized on Impaired Loans | 176 | 124 | 210 | 333 |
Land And Acquisition [Member] |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Recorded Investment of Loans Collectively Measured for Contingency Provision | 1,614 |  | 1,614 |  | 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 | 192,563 |  | 192,563 |  | 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 | 0 | 0 | 605 |
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 | 157,400 |  | 157,400 |  | 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 | 102,246 |  | 102,246 |  | 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 | 72 | 0 | 174 |
Consumer Portfolio Segment [Member] |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Recorded Investment of Loans Collectively Measured for Contingency Provision | 294,599 |  | 294,599 |  | 314,193
Recorded Investment of Loans Individually Measured for Specific Impairment | 2,228 |  | 2,228 |  | 4,022
Recorded Investment | 379 |  | 379 |  | 3,326
Unpaid Principal Balance | 514 |  | 514 |  | 3,584
Related Allowance | 17 |  | 17 |  | 31
Average Recorded Investment Impaired Loans | 2,842 | 5,646 | 3,290 | 6,135 |
Interest Recognized on Impaired Loans | 10 | $ 44 | 28 | $ 110 |
Impaired Loans With Recorded Allowance [Member] |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Recorded Investment | 15,177 |  | 15,177 |  | 13,351
Unpaid Principal Balance | 18,696 |  | 18,696 |  | 17,693
Impaired Loans Without Recorded Allowance [Member] | Secured Loans [Member] |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Recorded Investment | 16,465 |  | 16,465 |  | 19,935
Unpaid Principal Balance | 21,051 |  | 21,051 |  | 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 | 0 |  | 0 |  | 563
Unpaid Principal Balance | 0 |  | 0 |  | 575
Impaired Loans Without Recorded Allowance [Member] | Commercial Land [Member] |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Recorded Investment | 1,269 |  | 1,269 |  | 2,226
Unpaid Principal Balance | 1,304 |  | 1,304 |  | 2,272
Impaired Loans Without Recorded Allowance [Member] | Income Property Multifamily [Member] |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Recorded Investment | 0 |  | 0 |  | 2,855
Unpaid Principal Balance | 0 |  | 0 |  | 3,011
Impaired Loans Without Recorded Allowance [Member] | Owner Occupied [Member] |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Recorded Investment | 6,457 |  | 6,457 |  | 9,478
Unpaid Principal Balance | 6,599 |  | 6,599 |  | 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 | 1,849 |  | 1,849 |  | 696
Unpaid Principal Balance | $ 2,006 |  | $ 2,006 |  | $ 704

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