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Impairment of Securities - Schedule of Fair Values and Gross Unrealized and Unrecognized Losses on Investments (Detail) - USD ($) $ in Thousands | Mar. 31, 2019 | Jun. 30, 2018
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months | $ 256,258 | $ 293,729
Less than 12 Months: Fair Value | 2,090 | 3,755
Less than 12 Months: Unrealized Losses | 215,998 | 144,404
12 Months or More: Fair Value | $ 3,193 | $ 3,970
Number of securities | 82 | 132
Total: Fair Value | $ 472,256 | $ 438,133
Total: Unrealized Losses | 5,283 | 7,725
Debt Securities [Member] | Trust Preferred Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months: Unrealized Losses | 2,775 | 2,783
12 Months or More: Fair Value | $ 192 | $ 184
Number of securities | 2 | 2
Total: Fair Value | $ 2,775 | $ 2,783
Total: Unrealized Losses | 192 | 184
Debt Securities [Member] | U.S. Agency Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months |  | 2,579
Less than 12 Months: Fair Value |  | 43
Less than 12 Months: Unrealized Losses | 3,737 | 1,832
12 Months or More: Fair Value | $ 28 | $ 20
Number of securities | 8 | 9
Total: Fair Value | $ 3,737 | $ 4,411
Total: Unrealized Losses | 28 | 63
Debt Securities [Member] | Obligations of State and Political Subdivisions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months |  | 24,443
Less than 12 Months: Fair Value |  | 672
Less than 12 Months: Unrealized Losses | 6,583 | 540
12 Months or More: Fair Value | $ 37 | $ 37
Number of securities | 15 | 65
Total: Fair Value | $ 6,583 | $ 24,983
Total: Unrealized Losses | 37 | 709
Debt Securities [Member] | Asset-backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months | 35,733 |
Less than 12 Months: Fair Value | 242 |
Less than 12 Months: Unrealized Losses | 14,682 | 24,728
12 Months or More: Fair Value | $ 26 | $ 134
Number of securities | 6 | 3
Total: Fair Value | $ 50,415 | $ 24,728
Total: Unrealized Losses | 268 | 134
Debt Securities [Member] | Collateralized Loan Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months | 153,332 | 189,258
Less than 12 Months: Fair Value | 1,047 | $ 914
Less than 12 Months: Unrealized Losses | 54,574 |
12 Months or More: Fair Value | $ 577 |
Number of securities | 20 | 19
Total: Fair Value | $ 207,906 | $ 189,258
Total: Unrealized Losses | 1,624 | 914
Debt Securities [Member] | Corporate Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months | 67,193 | 5,035
Less than 12 Months: Fair Value | 801 | 4
Less than 12 Months: Unrealized Losses | 44,421 | 64,184
12 Months or More: Fair Value | $ 558 | $ 790
Number of securities | 12 | 6
Total: Fair Value | $ 111,614 | $ 69,219
Total: Unrealized Losses | 1,359 | 794
Collateralized Mortgage Obligations Excluding Pass Through Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months |  | 4,635
Less than 12 Months: Fair Value |  | 135
Less than 12 Months: Unrealized Losses | 21,660 | 19,658
12 Months or More: Fair Value | $ 582 | $ 1,224
Number of securities | 6 | 7
Total: Fair Value | $ 21,660 | $ 24,293
Total: Unrealized Losses | 582 | 1,359
Residential Pass-Through Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months |  | 63,889
Less than 12 Months: Fair Value |  | 1,921
Less than 12 Months: Unrealized Losses | 67,566 | 26,697
12 Months or More: Fair Value | $ 1,193 | $ 1,573
Number of securities | 13 | 19
Total: Fair Value | $ 67,566 | $ 90,586
Total: Unrealized Losses | $ 1,193 | 3,494
Commercial Pass-Through Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months |  | 3,890
Less than 12 Months: Fair Value |  | 66
Less than 12 Months: Unrealized Losses |  | 3,982
12 Months or More: Fair Value |  | $ 8
Number of securities |  | 2
Total: Fair Value |  | $ 7,872
Total: Unrealized Losses |  | $ 74

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