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Impairment of Securities - Schedule of Fair Values and Gross Unrealized and Unrecognized Losses on Investments (Detail) $ in Thousands | Sep. 30, 2019 USD ($) Security | Jun. 30, 2019 USD ($) Security
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months: Fair Value | $ 200,681 | $ 131,758
Less than 12 Months: Unrealized Losses | 875 | 846
12 Months or More: Fair Value | 264,995 | 219,076
12 Months or More: Unrealized Losses | $ 2,610 | $ 2,424
Number of Securities | Security | 87 | 47
Total: Fair Value | $ 465,676 | $ 350,834
Total: Unrealized Losses | 3,485 | 3,270
Debt Securities [Member] | Trust Preferred Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
12 Months or More: Fair Value | 2,775 | 2,756
12 Months or More: Unrealized Losses | $ 192 | $ 211
Number of Securities | Security | 2 | 2
Total: Fair Value | $ 2,775 | $ 2,756
Total: Unrealized Losses | 192 | 211
Debt Securities [Member] | Obligations of State and Political Subdivisions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months: Fair Value | 1,337 |
Less than 12 Months: Unrealized Losses | 1 |
12 Months or More: Fair Value | 770 |
12 Months or More: Unrealized Losses | $ 1 |
Number of Securities | Security | 5 |
Total: Fair Value | $ 2,107 |
Total: Unrealized Losses | 2 |
Debt Securities [Member] | Asset-backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months: Fair Value | 78,370 | 40,211
Less than 12 Months: Unrealized Losses | 506 | 262
12 Months or More: Fair Value | 4,965 | 4,934
12 Months or More: Unrealized Losses | $ 26 | $ 58
Number of Securities | Security | 8 | 4
Total: Fair Value | $ 83,335 | $ 45,145
Total: Unrealized Losses | 532 | 320
Debt Securities [Member] | Collateralized Loan Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months: Fair Value | 64,013 | 44,061
Less than 12 Months: Unrealized Losses | 121 | 75
12 Months or More: Fair Value | 116,021 | 115,914
12 Months or More: Unrealized Losses | $ 854 | $ 1,021
Number of Securities | Security | 17 | 15
Total: Fair Value | $ 180,034 | $ 159,975
Total: Unrealized Losses | 975 | 1,096
Debt Securities [Member] | Corporate Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months: Fair Value | 24,929 | 47,486
Less than 12 Months: Unrealized Losses | 71 | 509
12 Months or More: Fair Value | 72,155 | 44,462
12 Months or More: Unrealized Losses | $ 820 | $ 517
Number of Securities | Security | 12 | 11
Total: Fair Value | $ 97,084 | $ 91,948
Total: Unrealized Losses | 891 | 1,026
Debt Securities [Member] | U.S. Agency Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
12 Months or More: Fair Value |  | 1,122
12 Months or More: Unrealized Losses |  | $ 4
Number of Securities | Security |  | 5
Total: Fair Value |  | $ 1,122
Total: Unrealized Losses |  | 4
Collateralized Mortgage Obligations Excluding Pass Through Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months: Fair Value | 2,621 |
Less than 12 Months: Unrealized Losses | 19 |
12 Months or More: Fair Value | 14,840 | 16,369
12 Months or More: Unrealized Losses | $ 190 | $ 149
Number of Securities | Security | 8 | 4
Total: Fair Value | $ 17,461 | $ 16,369
Total: Unrealized Losses | 209 | 149
Residential Pass-Through Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months: Fair Value | 29,411 |
Less than 12 Months: Unrealized Losses | 157 |
12 Months or More: Fair Value | 52,334 | 33,519
12 Months or More: Unrealized Losses | $ 519 | $ 464
Number of Securities | Security | 34 | 6
Total: Fair Value | $ 81,745 | $ 33,519
Total: Unrealized Losses | 676 | $ 464
Commercial Pass-Through Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
12 Months or More: Fair Value | 1,135 |
12 Months or More: Unrealized Losses | $ 8 |
Number of Securities | Security | 1 |
Total: Fair Value | $ 1,135 |
Total: Unrealized Losses | $ 8 |

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