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Securities - Schedule of Fair Values and Gross Unrealized and Unrecognized Losses on Investments (Detail)
$ in Thousands
Mar. 31, 2022
USD ($)
Security
Jun. 30, 2021
USD ($)
Security
Schedule Of Available For Sale Securities [Line Items]    
Less than 12 Months: Fair Value $ 778,245 $ 634,019
Less than 12 Months: Unrealized Losses 21,869 9,945
12 Months or More: Fair Value 473,200 58,605
12 Months or More: Unrealized Losses $ 44,398 $ 161
Number of Securities | Security 147 31
Total: Fair Value $ 1,251,445 $ 692,624
Total: Unrealized Losses 66,267 10,106
Less than 12 Months: Securities Held to Maturity, Fair value 98,274  
Less than 12 Months: Securities Held to Maturity Unrecognized Losses $ 4,958  
Held to Maturity Securities Number of Securities | Security 17  
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value, Total $ 98,274  
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss, Total 4,958  
Obligations of State and Political Subdivisions [Member] | Trust Preferred Securities [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Less than 12 Months: Securities Held to Maturity, Fair value 4,901  
Less than 12 Months: Securities Held to Maturity Unrecognized Losses $ 24  
Held to Maturity Securities Number of Securities | Security 8  
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value, Total $ 4,901  
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss, Total 24  
Obligations of State and Political Subdivisions [Member] | Debt Securities [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Less than 12 Months: Fair Value 2,303  
Less than 12 Months: Unrealized Losses $ 13  
Number of Securities | Security 8  
Total: Fair Value $ 2,303  
Total: Unrealized Losses 13  
Asset-backed Securities [Member] | Debt Securities [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Less than 12 Months: Fair Value 180,827 12,159
Less than 12 Months: Unrealized Losses $ 1,788 $ 63
Number of Securities | Security 15 2
Total: Fair Value $ 180,827 $ 12,159
Total: Unrealized Losses 1,788 63
Collateralized Loan Obligations [Member] | Debt Securities [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Less than 12 Months: Fair Value 226,513 36,741
Less than 12 Months: Unrealized Losses 1,780 9
12 Months or More: Fair Value 52,851 58,605
12 Months or More: Unrealized Losses $ 262 $ 161
Number of Securities | Security 22 8
Total: Fair Value $ 279,364 $ 95,346
Total: Unrealized Losses 2,042 170
Corporate Bonds [Member] | Debt Securities [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Less than 12 Months: Fair Value 75,909 15,952
Less than 12 Months: Unrealized Losses 2,495 $ 73
12 Months or More: Fair Value 3,875  
12 Months or More: Unrealized Losses $ 125  
Number of Securities | Security 16 4
Total: Fair Value $ 79,784 $ 15,952
Total: Unrealized Losses 2,620 73
Collateralized mortgage obligations Member | Debt Securities [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Less than 12 Months: Fair Value 6,819  
Less than 12 Months: Unrealized Losses $ 270  
Number of Securities | Security 5  
Total: Fair Value $ 6,819  
Total: Unrealized Losses 270  
Commercial Pass-Through Securities [Member] | Trust Preferred Securities [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Less than 12 Months: Securities Held to Maturity, Fair value 11,345  
Less than 12 Months: Securities Held to Maturity Unrecognized Losses $ 945  
Held to Maturity Securities Number of Securities | Security 1  
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value, Total $ 11,345  
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss, Total 945  
Commercial Pass-Through Securities [Member] | Debt Securities [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Less than 12 Months: Fair Value 48,811 145,055
Less than 12 Months: Unrealized Losses 1,147 $ 2,652
12 Months or More: Fair Value 113,569  
12 Months or More: Unrealized Losses $ 10,818  
Number of Securities | Security 15 7
Total: Fair Value $ 162,380 $ 145,055
Total: Unrealized Losses 11,965 2,652
Residential Pass-Through Securities [Member] | Trust Preferred Securities [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Less than 12 Months: Securities Held to Maturity, Fair value 82,028  
Less than 12 Months: Securities Held to Maturity Unrecognized Losses $ 3,989  
Held to Maturity Securities Number of Securities | Security 8  
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value, Total $ 82,028  
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss, Total 3,989  
Residential Pass-Through Securities [Member] | Debt Securities [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Less than 12 Months: Fair Value 237,063 424,112
Less than 12 Months: Unrealized Losses 14,376 $ 7,148
12 Months or More: Fair Value 302,905  
12 Months or More: Unrealized Losses $ 33,193  
Number of Securities | Security 66 10
Total: Fair Value $ 539,968 $ 424,112
Total: Unrealized Losses $ 47,569 $ 7,148