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Deposits - Certificates and Other Time Deposits for Both Retail and Brokered (Detail)
$ in Thousands
Dec. 31, 2018
USD ($)
Time Deposits By Maturity [Line Items]  
2019 $ 525,947
2020 137,474
2021 68,957
2022 31,285
2023 30,750
Thereafter 18,498
Certificates and other time deposits 812,911
Retail [Member]  
Time Deposits By Maturity [Line Items]  
2019 498,382
2020 112,944
2021 48,422
2022 16,029
2023 14,052
Thereafter 18,498
Certificates and other time deposits 708,327
Brokered [Member]  
Time Deposits By Maturity [Line Items]  
2019 27,565
2020 24,530
2021 20,535
2022 15,256
2023 16,698
Certificates and other time deposits $ 104,584