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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