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Securities Available for Sale - Amortized Cost, Gross Unrealized Gains and Losses and Fair Values of Securities (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Jun. 30, 2017
Schedule of Available-for-sale Securities [Line Items]    
Securities available for sale, Amortized Cost $ 589,999  
Securities available for sale, Fair value 590,562 $ 444,497
Securities available for sale, Amortized Cost 729,406 616,145
Mortgage-backed securities, Gross Unrealized Gains 3,404 2,551
Mortgage-backed securities, Gross Unrealized Losses 7,725 4,936
Investment securities available for sale, at fair value 725,085 613,760
Mortgage-Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Securities available for sale, Amortized Cost 139,407 170,249
Mortgage-backed securities, Gross Unrealized Gains 43 884
Mortgage-backed securities, Gross Unrealized Losses 4,927 1,870
Investment securities available for sale, at fair value 134,523 169,263
Debt Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Securities available for sale, Amortized Cost 589,999 445,896
Securities available for sale, Gross Unrealized Gains 3,361 1,667
Securities available for sale, Gross Unrealized Losses 2,798 3,066
Securities available for sale, Fair value 590,562 444,497
Debt Securities [Member] | U.S. Agency Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Securities available for sale, Amortized Cost 4,474 5,304
Securities available for sale, Gross Unrealized Gains   35
Securities available for sale, Gross Unrealized Losses 63 23
Securities available for sale, Fair value 4,411 5,316
Debt Securities [Member] | Obligations of State and Political Subdivisions [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Securities available for sale, Amortized Cost 26,793 27,465
Securities available for sale, Gross Unrealized Gains 4 305
Securities available for sale, Gross Unrealized Losses 709 30
Securities available for sale, Fair value 26,088 27,740
Debt Securities [Member] | Asset-backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Securities available for sale, Amortized Cost 179,959 163,120
Securities available for sale, Gross Unrealized Gains 2,795 316
Securities available for sale, Gross Unrealized Losses 134 1,007
Securities available for sale, Fair value 182,620 162,429
Debt Securities [Member] | Collateralized Loan Obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Securities available for sale, Amortized Cost 226,881 98,078
Securities available for sale, Gross Unrealized Gains 99 185
Securities available for sale, Gross Unrealized Losses 914 109
Securities available for sale, Fair value 226,066 98,154
Debt Securities [Member] | Corporate Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Securities available for sale, Amortized Cost 147,925 143,017
Securities available for sale, Gross Unrealized Gains 463 826
Securities available for sale, Gross Unrealized Losses 794 1,525
Securities available for sale, Fair value 147,594 142,318
Debt Securities [Member] | Trust Preferred Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Securities available for sale, Amortized Cost 3,967 8,912
Securities available for sale, Gross Unrealized Losses 184 372
Securities available for sale, Fair value 3,783 8,540
Collateralized Mortgage Obligations Excluding Pass Through Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Securities available for sale, Amortized Cost 25,651 31,124
Mortgage-backed securities, Gross Unrealized Gains   38
Mortgage-backed securities, Gross Unrealized Losses 1,359 626
Investment securities available for sale, at fair value 24,292 30,536
Collateralized Mortgage Obligations Excluding Pass Through Securities [Member] | Federal Home Loan Mortgage Corporation [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Securities available for sale, Amortized Cost 8,032 9,902
Mortgage-backed securities, Gross Unrealized Gains   38
Mortgage-backed securities, Gross Unrealized Losses 347 66
Investment securities available for sale, at fair value 7,685 9,874
Collateralized Mortgage Obligations Excluding Pass Through Securities [Member] | Federal National Mortgage Association [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Securities available for sale, Amortized Cost 17,619 21,222
Mortgage-backed securities, Gross Unrealized Losses 1,012 560
Investment securities available for sale, at fair value 16,607 20,662
Residential Pass-Through Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Securities available for sale, Amortized Cost 105,810 131,017
Mortgage-backed securities, Gross Unrealized Gains 43 777
Mortgage-backed securities, Gross Unrealized Losses 3,494 1,244
Investment securities available for sale, at fair value 102,359 130,550
Residential Pass-Through Securities [Member] | Federal Home Loan Mortgage Corporation [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Securities available for sale, Amortized Cost 78,639 95,501
Mortgage-backed securities, Gross Unrealized Gains 19 352
Mortgage-backed securities, Gross Unrealized Losses 2,868 999
Investment securities available for sale, at fair value 75,790 94,854
Residential Pass-Through Securities [Member] | Federal National Mortgage Association [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Securities available for sale, Amortized Cost 27,171 35,516
Mortgage-backed securities, Gross Unrealized Gains 24 425
Mortgage-backed securities, Gross Unrealized Losses 626 245
Investment securities available for sale, at fair value 26,569 35,696
Commercial Pass-Through Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Securities available for sale, Amortized Cost 7,946 8,108
Mortgage-backed securities, Gross Unrealized Gains   69
Mortgage-backed securities, Gross Unrealized Losses 74  
Investment securities available for sale, at fair value 7,872 8,177
Commercial Pass-Through Securities [Member] | Federal National Mortgage Association [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Securities available for sale, Amortized Cost 7,946 8,108
Mortgage-backed securities, Gross Unrealized Gains   69
Mortgage-backed securities, Gross Unrealized Losses 74  
Investment securities available for sale, at fair value $ 7,872 $ 8,177