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Impairment of Securities - Schedule of Temporary Impairment Losses, Investments (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Jun. 30, 2018
Schedule Of Held To Maturity Securities [Line Items]    
Less than 12 Months $ 22,730 $ 476,641
Less than 12 Months: Fair Value 186 7,824
Less than 12 Months: Unrecognized Losses 195,910 78,832
12 Months or More: Fair Value $ 2,293 $ 2,548
Number of securities 185 371
Total: Fair Value $ 218,640 $ 555,473
Total: Unrecognized Losses 2,479 10,372
Debt Securities [Member]    
Schedule Of Held To Maturity Securities [Line Items]    
Total: Unrecognized Losses 371 2,149
Debt Securities [Member] | Obligations of State and Political Subdivisions [Member]    
Schedule Of Held To Maturity Securities [Line Items]    
Less than 12 Months 2,235 86,678
Less than 12 Months: Fair Value 3 1,662
Less than 12 Months: Unrecognized Losses 35,556 3,151
12 Months or More: Fair Value $ 177 $ 203
Number of securities 79 190
Total: Fair Value $ 37,791 $ 89,829
Total: Unrecognized Losses 180 1,865
Debt Securities [Member] | Subordinated Debt [Member]    
Schedule Of Held To Maturity Securities [Line Items]    
Less than 12 Months 20,212 41,010
Less than 12 Months: Fair Value 182 $ 284
Less than 12 Months: Unrecognized Losses 4,991  
12 Months or More: Fair Value $ 9  
Number of securities 6 7
Total: Fair Value $ 25,203 $ 41,010
Total: Unrecognized Losses 191 284
Collateralized Mortgage Obligations Excluding Pass Through Securities [Member]    
Schedule Of Held To Maturity Securities [Line Items]    
Less than 12 Months   42,712
Less than 12 Months: Fair Value   753
Less than 12 Months: Unrecognized Losses 10,088 12,730
12 Months or More: Fair Value $ 298 $ 595
Number of securities 6 8
Total: Fair Value $ 10,088 $ 55,442
Total: Unrecognized Losses 298 1,348
Residential Pass-Through Securities [Member]    
Schedule Of Held To Maturity Securities [Line Items]    
Less than 12 Months 283 133,859
Less than 12 Months: Fair Value 1 2,258
Less than 12 Months: Unrecognized Losses 101,874 61,760
12 Months or More: Fair Value $ 1,624 $ 1,747
Number of securities 86 131
Total: Fair Value $ 102,157 $ 195,619
Total: Unrecognized Losses 1,625 4,005
Commercial Pass-Through Securities [Member]    
Schedule Of Held To Maturity Securities [Line Items]    
Less than 12 Months   172,382
Less than 12 Months: Fair Value   2,867
Less than 12 Months: Unrecognized Losses 43,401 1,191
12 Months or More: Fair Value $ 185 $ 3
Number of securities 8 35
Total: Fair Value $ 43,401 $ 173,573
Total: Unrecognized Losses $ 185 $ 2,870