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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