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Allowance for Losses on Loans - Allowance for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Allowance	$ 131,534	$ 129,257
Charge-offs	(618)	(1,641)
Recoveries	3,197	3,049
Provision & Transfers	(1,600)	500
Ending Allowance	132,513	131,165
Single-family residential
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Allowance	30,988	33,033
Charge-offs	(15)	(25)
Recoveries	261	230
Provision & Transfers	(534)	(1,754)
Ending Allowance	30,700	31,484
Construction
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Allowance	32,304	31,317
Charge-offs	0	0
Recoveries	54	0
Provision & Transfers	(66)	146
Ending Allowance	32,292	31,463
Construction - custom
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Allowance	1,369	1,842
Charge-offs	0	0
Recoveries	0	0
Provision & Transfers	30	84
Ending Allowance	1,399	1,926
Land - acquisition & development
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Allowance	9,155	7,978
Charge-offs	(11)	0
Recoveries	1,460	1,782
Provision & Transfers	(1,858)	(604)
Ending Allowance	8,746	9,156
Land - consumer lot loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Allowance	2,143	2,164
Charge-offs	(70)	(72)
Recoveries	10	265
Provision & Transfers	7	(213)
Ending Allowance	2,090	2,144
Multi-family
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Allowance	7,391	8,329
Charge-offs	0	0
Recoveries	498	0
Provision & Transfers	(485)	(445)
Ending Allowance	7,404	7,884
Commercial real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Allowance	13,170	11,852
Charge-offs	(98)	(339)
Recoveries	368	525
Provision & Transfers	(405)	673
Ending Allowance	13,035	12,711
Commercial & industrial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Allowance	31,450	28,702
Charge-offs	(50)	(179)
Recoveries	144	33
Provision & Transfers	1,996	1,723
Ending Allowance	33,540	30,279
HELOC
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Allowance	1,103	781
Charge-offs	0	(886)
Recoveries	93	1
Provision & Transfers	(92)	1,168
Ending Allowance	1,104	1,064
Consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Allowance	2,461	3,259
Charge-offs	(374)	(140)
Recoveries	309	213
Provision & Transfers	(193)	(278)
Ending Allowance	$ 2,203	$ 3,054

X

- Definition

Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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Amount of recovery of financing receivables doubtful of collection that were previously charged off.

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