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Allowance for Losses on Loans - Loans Evaluated for Impairment (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance Allocation | $ 139,501 | $ 132,513 | $ 131,534 | $ 133,086 | $ 131,165 | $ 129,257
Recorded Investment of Loans | 13,434,649 |  | 13,312,388 |  |  |
Loans Collectively Evaluated for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance Allocation | 139,492 |  | 131,095 |  |  |
Recorded Investment of Loans | $ 12,110,082 |  | $ 12,076,622 |  |  |
Ratio | 1.20% |  | 1.10% |  |  |
Loans Individually Evaluated for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance Allocation | $ 9 |  | $ 439 |  |  |
Recorded Investment of Loans | $ 34,755 |  | $ 34,425 |  |  |
Ratio | 0.00% |  | 1.30% |  |  |
Single-family residential |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance Allocation | $ 29,280 | 30,700 | $ 30,988 | 31,476 | 31,484 | 33,033
Recorded Investment of Loans | 5,582,244 |  | 5,835,194 |  |  |
Single-family residential | Loans Collectively Evaluated for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance Allocation | 29,280 |  | 30,988 |  |  |
Recorded Investment of Loans | $ 5,566,786 |  | $ 5,822,200 |  |  |
Ratio | 0.50% |  | 0.50% |  |  |
Single-family residential | Loans Individually Evaluated for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance Allocation | $ 0 |  | $ 0 |  |  |
Recorded Investment of Loans | $ 19,606 |  | $ 17,978 |  |  |
Ratio | 0.00% |  | 0.00% |  |  |
Construction |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance Allocation | $ 34,283 | 32,292 | $ 32,304 | 33,396 | 31,463 | 31,317
Recorded Investment of Loans | 2,204,283 |  | 2,038,052 |  |  |
Construction | Loans Collectively Evaluated for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance Allocation | 34,283 |  | 32,304 |  |  |
Recorded Investment of Loans | $ 1,232,378 |  | $ 1,164,889 |  |  |
Ratio | 2.80% |  | 2.80% |  |  |
Construction | Loans Individually Evaluated for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance Allocation | $ 0 |  | $ 0 |  |  |
Recorded Investment of Loans | $ 3,353 |  | $ 0 |  |  |
Ratio | 0.00% |  | 0.00% |  |  |
Construction - custom |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance Allocation | $ 1,580 | 1,399 | $ 1,369 | 1,976 | 1,926 | 1,842
Recorded Investment of Loans | 547,731 |  | 540,741 |  |  |
Construction - custom | Loans Collectively Evaluated for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance Allocation | 1,580 |  | 1,369 |  |  |
Recorded Investment of Loans | $ 270,880 |  | $ 255,505 |  |  |
Ratio | 0.60% |  | 0.50% |  |  |
Construction - custom | Loans Individually Evaluated for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance Allocation | $ 0 |  | $ 0 |  |  |
Recorded Investment of Loans | $ 0 |  | $ 0 |  |  |
Ratio | 0.00% |  | 0.00% |  |  |
Land - acquisition & development |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance Allocation | $ 8,733 | 8,746 | $ 9,155 | 9,734 | 9,156 | 7,978
Recorded Investment of Loans | 197,010 |  | 204,107 |  |  |
Land - acquisition & development | Loans Collectively Evaluated for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance Allocation | 8,732 |  | 9,135 |  |  |
Recorded Investment of Loans | $ 152,541 |  | $ 160,964 |  |  |
Ratio | 5.70% |  | 5.70% |  |  |
Land - acquisition & development | Loans Individually Evaluated for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance Allocation | $ 1 |  | $ 20 |  |  |
Recorded Investment of Loans | $ 82 |  | $ 230 |  |  |
Ratio | 1.20% |  | 8.70% |  |  |
Land - consumer lot loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance Allocation | $ 2,106 | 2,090 | $ 2,143 | 2,076 | 2,144 | 2,164
Recorded Investment of Loans | 96,579 |  | 99,694 |  |  |
Land - consumer lot loans | Loans Collectively Evaluated for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance Allocation | 2,106 |  | 2,143 |  |  |
Recorded Investment of Loans | $ 92,881 |  | $ 95,574 |  |  |
Ratio | 2.30% |  | 2.20% |  |  |
Land - consumer lot loans | Loans Individually Evaluated for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance Allocation | $ 0 |  | $ 0 |  |  |
Recorded Investment of Loans | $ 372 |  | $ 375 |  |  |
Ratio | 0.00% |  | 0.00% |  |  |
Multi-family |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance Allocation | $ 8,567 | 7,404 | $ 7,391 | 7,394 | 7,884 | 8,329
Recorded Investment of Loans | 1,467,231 |  | 1,422,674 |  |  |
Multi-family | Loans Collectively Evaluated for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance Allocation | 8,566 |  | 7,387 |  |  |
Recorded Investment of Loans | $ 1,466,892 |  | $ 1,422,266 |  |  |
Ratio | 0.60% |  | 0.50% |  |  |
Multi-family | Loans Individually Evaluated for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance Allocation | $ 1 |  | $ 4 |  |  |
Recorded Investment of Loans | $ 316 |  | $ 385 |  |  |
Ratio | 0.30% |  | 1.00% |  |  |
Commercial real estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance Allocation | $ 15,020 | 13,035 | $ 13,170 | 12,448 | 12,711 | 11,852
Recorded Investment of Loans | 1,717,535 |  | 1,631,170 |  |  |
Commercial real estate | Loans Collectively Evaluated for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance Allocation | 15,016 |  | 12,847 |  |  |
Recorded Investment of Loans | $ 1,708,240 |  | $ 1,618,406 |  |  |
Ratio | 0.90% |  | 0.80% |  |  |
Commercial real estate | Loans Individually Evaluated for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance Allocation | $ 4 |  | $ 323 |  |  |
Recorded Investment of Loans | $ 9,295 |  | $ 12,765 |  |  |
Ratio | 0.00% |  | 2.50% |  |  |
Commercial & industrial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance Allocation | $ 36,435 | 33,540 | $ 31,450 | 30,574 | 30,279 | 28,702
Recorded Investment of Loans | 1,371,128 |  | 1,268,695 |  |  |
Commercial & industrial | Loans Collectively Evaluated for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance Allocation | 36,432 |  | 31,358 |  |  |
Recorded Investment of Loans | $ 1,370,838 |  | $ 1,266,913 |  |  |
Ratio | 2.70% |  | 2.50% |  |  |
Commercial & industrial | Loans Individually Evaluated for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance Allocation | $ 3 |  | $ 92 |  |  |
Recorded Investment of Loans | $ 855 |  | $ 1,805 |  |  |
Ratio | 0.40% |  | 5.10% |  |  |
HELOC |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance Allocation | $ 1,282 | 1,104 | $ 1,103 | 1,082 | 1,064 | 781
Recorded Investment of Loans | 145,761 |  | 142,178 |  |  |
HELOC | Loans Collectively Evaluated for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance Allocation | 1,282 |  | 1,103 |  |  |
Recorded Investment of Loans | $ 144,119 |  | $ 140,378 |  |  |
Ratio | 0.90% |  | 0.80% |  |  |
HELOC | Loans Individually Evaluated for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance Allocation | $ 0 |  | $ 0 |  |  |
Recorded Investment of Loans | $ 876 |  | $ 837 |  |  |
Ratio | 0.00% |  | 0.00% |  |  |
Consumer |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance Allocation | $ 2,215 | $ 2,203 | $ 2,461 | $ 2,930 | $ 3,054 | $ 3,259
Recorded Investment of Loans | 105,147 |  | 129,883 |  |  |
Consumer | Loans Collectively Evaluated for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance Allocation | 2,215 |  | 2,461 |  |  |
Recorded Investment of Loans | $ 104,527 |  | $ 129,527 |  |  |
Ratio | 2.10% |  | 1.90% |  |  |
Consumer | Loans Individually Evaluated for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance Allocation | $ 0 |  | $ 0 |  |  |
Recorded Investment of Loans | $ 0 |  | $ 50 |  |  |
Ratio | 0.00% |  | 0.00% |  |  |

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