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Securities Available for Sale - Amortized Cost, Gross Unrealized Gains and Losses and Fair Values of Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Jun. 30, 2019
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, Amortized Cost	$ 665,173
Securities available for sale, Fair value	666,377	$ 544,333
Securities available for sale, Amortized Cost	1,219,546	712,288
Mortgage-backed securities, Gross Unrealized Gains	15,630	5,245
Mortgage-backed securities, Gross Unrealized Losses	3,485	3,270
Investment securities available for sale, at fair value	1,231,691	714,263
Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, Amortized Cost	665,173	544,787
Securities available for sale, Gross Unrealized Gains	3,796	2,203
Securities available for sale, Gross Unrealized Losses	2,592	2,657
Securities available for sale, Fair value	666,377	544,333
Debt Securities [Member] | U.S. Agency Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, Amortized Cost	680	3,642
Securities available for sale, Gross Unrealized Gains	14	40
Securities available for sale, Gross Unrealized Losses	0	4
Securities available for sale, Fair value	694	3,678
Debt Securities [Member] | Obligations of State and Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, Amortized Cost	89,447	26,628
Securities available for sale, Gross Unrealized Gains	1,605	323
Securities available for sale, Gross Unrealized Losses	2
Securities available for sale, Fair value	91,050	26,951
Debt Securities [Member] | Asset-backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, Amortized Cost	180,689	178,168
Securities available for sale, Gross Unrealized Gains	911	1,465
Securities available for sale, Gross Unrealized Losses	532	320
Securities available for sale, Fair value	181,068	179,313
Debt Securities [Member] | Collateralized Loan Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, Amortized Cost	199,394	209,453
Securities available for sale, Gross Unrealized Gains	130	254
Securities available for sale, Gross Unrealized Losses	975	1,096
Securities available for sale, Fair value	198,549	208,611
Debt Securities [Member] | Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, Amortized Cost	190,996	122,929
Securities available for sale, Gross Unrealized Gains	1,136	121
Securities available for sale, Gross Unrealized Losses	891	1,026
Securities available for sale, Fair value	191,241	122,024
Debt Securities [Member] | Trust Preferred Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, Amortized Cost	3,967	3,967
Securities available for sale, Gross Unrealized Gains	0
Securities available for sale, Gross Unrealized Losses	192	211
Securities available for sale, Fair value	3,775	3,756
Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, Amortized Cost	554,373	167,501
Mortgage-backed securities, Gross Unrealized Gains	11,834	3,042
Mortgage-backed securities, Gross Unrealized Losses	893	613
Investment securities available for sale, at fair value	565,314	169,930
Mortgage-Backed Securities [Member] | Collateralized Mortgage Obligations Excluding Pass Through Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, Amortized Cost	63,117	21,469
Mortgage-backed securities, Gross Unrealized Gains	677	70
Mortgage-backed securities, Gross Unrealized Losses	209	149
Investment securities available for sale, at fair value	63,585	21,390
Mortgage-Backed Securities [Member] | Residential Pass-Through Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, Amortized Cost	200,399	44,611
Mortgage-backed securities, Gross Unrealized Gains	3,135	156
Mortgage-backed securities, Gross Unrealized Losses	676	464
Investment securities available for sale, at fair value	202,858	44,303
Mortgage-Backed Securities [Member] | Commercial Pass-Through Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, Amortized Cost	290,848	101,421
Mortgage-backed securities, Gross Unrealized Gains	8,022	2,816
Mortgage-backed securities, Gross Unrealized Losses	8
Investment securities available for sale, at fair value	298,862	$ 104,237
Mortgage-Backed Securities [Member] | Non-agency securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, Amortized Cost	9
Mortgage-backed securities, Gross Unrealized Gains	0
Mortgage-backed securities, Gross Unrealized Losses	0
Investment securities available for sale, at fair value	$ 9

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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