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Securities Available for Sale - Amortized Cost, Gross Unrealized Gains and Losses and Fair Values of Securities (Detail) - USD ($) $ in Thousands | Mar. 31, 2019 | Jun. 30, 2018
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Schedule of Available-for-sale Securities [Line Items] |  |
Securities available for sale, Amortized Cost | $ 545,654 |
Securities available for sale, Fair value | 543,891 | $ 590,562
Securities available for sale, Amortized Cost | 729,606 | 729,406
Mortgage-backed securities, Gross Unrealized Gains | 2,597 | 3,404
Mortgage-backed securities, Gross Unrealized Losses | 5,283 | 7,725
Investment securities available for sale, at fair value | 726,920 | 725,085
Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities available for sale, Amortized Cost | 545,654 | 589,999
Securities available for sale, Gross Unrealized Gains | 1,745 | 3,361
Securities available for sale, Gross Unrealized Losses | 3,508 | 2,798
Securities available for sale, Fair value | 543,891 | 590,562
Debt Securities [Member] | U.S. Agency Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities available for sale, Amortized Cost | 3,765 | 4,474
Securities available for sale, Gross Unrealized Losses | 28 | 63
Securities available for sale, Fair value | 3,737 | 4,411
Debt Securities [Member] | Obligations of State and Political Subdivisions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities available for sale, Amortized Cost | 26,634 | 26,793
Securities available for sale, Gross Unrealized Gains | 134 | 4
Securities available for sale, Gross Unrealized Losses | 37 | 709
Securities available for sale, Fair value | 26,731 | 26,088
Debt Securities [Member] | Asset-backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities available for sale, Amortized Cost | 178,830 | 179,959
Securities available for sale, Gross Unrealized Gains | 1,583 | 2,795
Securities available for sale, Gross Unrealized Losses | 268 | 134
Securities available for sale, Fair value | 180,145 | 182,620
Debt Securities [Member] | Collateralized Loan Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities available for sale, Amortized Cost | 209,530 | 226,881
Securities available for sale, Gross Unrealized Gains |  | 99
Securities available for sale, Gross Unrealized Losses | 1,624 | 914
Securities available for sale, Fair value | 207,906 | 226,066
Debt Securities [Member] | Corporate Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities available for sale, Amortized Cost | 122,928 | 147,925
Securities available for sale, Gross Unrealized Gains | 28 | 463
Securities available for sale, Gross Unrealized Losses | 1,359 | 794
Securities available for sale, Fair value | 121,597 | 147,594
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 Losses | 192 | 184
Securities available for sale, Fair value | 3,775 | 3,783
Mortgage-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities available for sale, Amortized Cost | 183,952 | 139,407
Mortgage-backed securities, Gross Unrealized Gains | 852 | 43
Mortgage-backed securities, Gross Unrealized Losses | 1,775 | 4,927
Investment securities available for sale, at fair value | 183,029 | 134,523
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 | 22,242 | 25,651
Mortgage-backed securities, Gross Unrealized Losses | 582 | 1,359
Investment securities available for sale, at fair value | 21,660 | 24,292
Mortgage-Backed Securities [Member] | Residential Pass-Through Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities available for sale, Amortized Cost | 71,663 | 105,810
Mortgage-backed securities, Gross Unrealized Gains | 43 | 43
Mortgage-backed securities, Gross Unrealized Losses | 1,193 | 3,494
Investment securities available for sale, at fair value | 70,513 | 102,359
Mortgage-Backed Securities [Member] | Commercial Pass-Through Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities available for sale, Amortized Cost | 90,047 | 7,946
Mortgage-backed securities, Gross Unrealized Gains | 809 |
Mortgage-backed securities, Gross Unrealized Losses |  | 74
Investment securities available for sale, at fair value | $ 90,856 | $ 7,872

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- Definition 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). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition Amount, before tax, of unrealized loss 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). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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