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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
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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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- 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=118939692&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=118939692&loc=d3e27161-111563 + Details
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