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Comprehensive Income - Schedule of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Jun. 30, 2019	Sep. 30, 2018	Jun. 30, 2018
Accumulated Other Comprehensive Income Loss [Line Items]
Total Stockholders' Equity	$ 1,110,789	$ 1,127,159	$ 1,235,550	$ 1,268,748
Net Unrealized Loss on Securities Available for Sale [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Net unrealized gain on securities available for sale	12,145	1,975
Tax effect	(3,441)	(573)
Total Stockholders' Equity	8,704	1,402
Net Unrealized Loss on Securities Transferred from Available for Sale to Held to Maturity [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Net unrealized gain on securities available for sale		(596)
Tax effect		175
Total Stockholders' Equity		(421)
Fair Value Adjustments on Derivatives [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Net unrealized gain on securities available for sale	586	3,716
Tax effect	(171)	(1,094)
Total Stockholders' Equity	415	2,622
Benefit Plan Adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Net unrealized gain on securities available for sale	(608)	(1,083)
Tax effect	179	319
Total Stockholders' Equity	(429)	(764)
Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Total Stockholders' Equity	$ 8,690	$ 2,839	$ 18,818	$ 18,535

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Amount before tax of increase (decrease) in accumulated equity from transactions and other events and circumstances from non-owner sources, attributable to parent. Excludes net income (loss), and accumulated changes in equity from transactions resulting from investments by owners (distributions to owners).

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section S99
-Paragraph 2
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