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Comprehensive Income - Schedule of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2015
Accumulated Other Comprehensive Income Loss [Line Items]        
Total accumulated other comprehensive income (loss) $ 1,268,748 $ 1,057,181 $ 1,147,629 $ 1,167,375
Net Unrealized Loss on Securities Available for Sale [Member]        
Accumulated Other Comprehensive Income Loss [Line Items]        
Accumulated other comprehensive income (loss), before tax (4,321) (2,385)    
Tax effect 1,159 975    
Total accumulated other comprehensive income (loss) (3,162) (1,410)    
Net Unrealized Loss on Securities Transferred from Available for Sale to Held to Maturity [Member]        
Accumulated Other Comprehensive Income Loss [Line Items]        
Accumulated other comprehensive income (loss), before tax (887) (1,109)    
Tax effect 249 453    
Total accumulated other comprehensive income (loss) (638) (656)    
Fair Value Adjustments on Derivatives [Member]        
Accumulated Other Comprehensive Income Loss [Line Items]        
Accumulated other comprehensive income (loss), before tax 31,881 6,319    
Tax effect (8,961) (2,582)    
Total accumulated other comprehensive income (loss) 22,920 3,737    
Benefit Plan Adjustments [Member]        
Accumulated Other Comprehensive Income Loss [Line Items]        
Accumulated other comprehensive income (loss), before tax (813) (1,061)    
Tax effect 228 434    
Total accumulated other comprehensive income (loss) (585) (627)    
Accumulated Other Comprehensive Income [Member]        
Accumulated Other Comprehensive Income Loss [Line Items]        
Total accumulated other comprehensive income (loss) $ 18,535 $ 1,044 $ (16,787) $ (7,761)