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Allowance for Losses on Loans - Internally Assigned Grade (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Dec. 31, 2021 | Mar. 31, 2021 | Sep. 30, 2021
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans | $ 14,763,613 |  | $ 14,004,870
Pass |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans | $ 14,346,331 |  | 13,506,282
Pass | Accounts Receivable | Credit Concentration Risk |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total grade as a % of total loans | 97.17% | 96.44% |
Special mention |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans | $ 124,230 |  | 111,554
Special mention | Accounts Receivable | Credit Concentration Risk |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total grade as a % of total loans | 0.84% | 0.80% |
Substandard |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans | $ 293,052 |  | 387,034
Substandard | Accounts Receivable | Credit Concentration Risk |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total grade as a % of total loans | 1.99% | 2.76% |
Doubtful |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans | $ 0 |  | 0
Doubtful | Accounts Receivable | Credit Concentration Risk |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total grade as a % of total loans | 0.00% | 0.00% |
Loss |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans | $ 0 |  | 0
Loss | Accounts Receivable | Credit Concentration Risk |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total grade as a % of total loans | 0.00% | 0.00% |
Commercial loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans | $ 8,748,073 |  | 8,316,591
Commercial loans | Pass |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans | 8,353,360 |  | 7,840,800
Commercial loans | Special mention |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans | 124,229 |  | 111,554
Commercial loans | Substandard |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans | 270,484 |  | 364,237
Commercial loans | Doubtful |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans | 0 |  | 0
Commercial loans | Loss |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans | 0 |  | 0
Commercial loans | Multi-family |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans | 2,278,216 |  | 2,273,689
Commercial loans | Multi-family | Pass |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans | 2,270,465 |  | 2,252,395
Commercial loans | Multi-family | Special mention |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans | 4,852 |  | 4,874
Commercial loans | Multi-family | Substandard |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans | 2,899 |  | 16,420
Commercial loans | Multi-family | Doubtful |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans | 0 |  | 0
Commercial loans | Multi-family | Loss |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans | 0 |  | 0
Commercial loans | Commercial real estate |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans | 2,667,170 |  | 2,429,332
Commercial loans | Commercial real estate | Pass |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans | 2,489,064 |  | 2,174,386
Commercial loans | Commercial real estate | Special mention |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans | 58,049 |  | 57,625
Commercial loans | Commercial real estate | Substandard |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans | 120,057 |  | 197,321
Commercial loans | Commercial real estate | Doubtful |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans | 0 |  | 0
Commercial loans | Commercial real estate | Loss |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans | 0 |  | 0
Commercial loans | Commercial & industrial |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans | 2,365,487 |  | 2,303,927
Commercial loans | Commercial & industrial | Pass |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans | 2,160,147 |  | 2,108,152
Commercial loans | Commercial & industrial | Special mention |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans | 60,762 |  | 48,124
Commercial loans | Commercial & industrial | Substandard |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans | 144,578 |  | 147,651
Commercial loans | Commercial & industrial | Doubtful |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans | 0 |  | 0
Commercial loans | Commercial & industrial | Loss |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans | 0 |  | 0
Commercial loans | Construction |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans | 1,235,119 |  | 1,117,227
Commercial loans | Construction | Pass |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans | 1,233,943 |  | 1,115,791
Commercial loans | Construction | Special mention |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans | 566 |  | 931
Commercial loans | Construction | Substandard |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans | 610 |  | 505
Commercial loans | Construction | Doubtful |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans | 0 |  | 0
Commercial loans | Construction | Loss |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans | 0 |  | 0
Commercial loans | Land - acquisition & development |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans | 202,081 |  | 192,416
Commercial loans | Land - acquisition & development | Pass |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans | 199,741 |  | 190,076
Commercial loans | Land - acquisition & development | Special mention |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans | 0 |  | 0
Commercial loans | Land - acquisition & development | Substandard |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans | 2,340 |  | 2,340
Commercial loans | Land - acquisition & development | Doubtful |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans | 0 |  | 0
Commercial loans | Land - acquisition & development | Loss |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans | 0 |  | 0
Consumer loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans | 6,015,540 |  | 5,688,279
Consumer loans | Pass |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans | 5,992,971 |  | 5,665,482
Consumer loans | Special mention |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans | 1 |  | 0
Consumer loans | Substandard |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans | 22,568 |  | 22,797
Consumer loans | Doubtful |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans | 0 |  | 0
Consumer loans | Loss |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans | 0 |  | 0
Consumer loans | Construction |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans | 333,583 |  | 347,752
Consumer loans | Construction | Pass |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans | 333,118 |  | 347,752
Consumer loans | Construction | Special mention |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans | 0 |  | 0
Consumer loans | Construction | Substandard |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans | 465 |  | 0
Consumer loans | Construction | Doubtful |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans | 0 |  | 0
Consumer loans | Construction | Loss |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans | 0 |  | 0
Consumer loans | Single-family residential |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans | 5,286,559 |  | 4,937,064
Consumer loans | Single-family residential | Pass |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans | 5,265,363 |  | 4,915,106
Consumer loans | Single-family residential | Special mention |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans | 0 |  | 0
Consumer loans | Single-family residential | Substandard |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans | 21,196 |  | 21,958
Consumer loans | Single-family residential | Doubtful |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans | 0 |  | 0
Consumer loans | Single-family residential | Loss |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans | 0 |  | 0
Consumer loans | Land - consumer lot loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans | 149,845 |  | 148,534
Consumer loans | Land - consumer lot loans | Pass |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans | 149,225 |  | 148,010
Consumer loans | Land - consumer lot loans | Special mention |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans | 0 |  | 0
Consumer loans | Land - consumer lot loans | Substandard |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans | 620 |  | 524
Consumer loans | Land - consumer lot loans | Doubtful |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans | 0 |  | 0
Consumer loans | Land - consumer lot loans | Loss |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans | 0 |  | 0
Consumer loans | HELOC |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans | 167,789 |  | 166,940
Consumer loans | HELOC | Pass |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans | 167,513 |  | 166,652
Consumer loans | HELOC | Special mention |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans | 0 |  | 0
Consumer loans | HELOC | Substandard |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans | 276 |  | 288
Consumer loans | HELOC | Doubtful |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans | 0 |  | 0
Consumer loans | HELOC | Loss |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans | 0 |  | 0
Consumer loans | Consumer |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans | 77,764 |  | 87,989
Consumer loans | Consumer | Pass |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans | 77,752 |  | 87,962
Consumer loans | Consumer | Special mention |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans | 1 |  | 0
Consumer loans | Consumer | Substandard |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans | 11 |  | 27
Consumer loans | Consumer | Doubtful |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans | 0 |  | 0
Consumer loans | Consumer | Loss |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans | $ 0 |  | $ 0

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