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Funds Borrowed - Schedule of Outstanding Balances of Funds Borrowed (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
2019 $ 509,982  
2020 290,295  
2021 170,268  
2022 142,250  
2023 45,547  
Thereafter 68,000  
Long term debt $ 1,226,342  
Interest Rate [1] 2.59%  
Deposits [Member]    
Debt Instrument [Line Items]    
2019 $ 330,290  
2020 255,172  
2021 128,143  
2022 142,250  
2023 $ 40,547  
Interest Rate [1] 1.91%  
DZ Loan [Member]    
Debt Instrument [Line Items]    
2019 $ 96,925  
Interest Rate [1] 3.75%  
Small Business Administration Debentures and Borrowings [Member]    
Debt Instrument [Line Items]    
2019 $ 3,716  
2020 25,881  
2021 8,500  
2023 5,000  
Thereafter $ 35,000  
Interest Rate [1] 3.39%  
Retail Notes [Member]    
Debt Instrument [Line Items]    
2021 $ 33,625  
Interest Rate [1] 9.00%  
Preferred Securities [Member]    
Debt Instrument [Line Items]    
Thereafter $ 33,000  
Interest Rate [1] 4.44%  
Other Borrowings [Member]    
Debt Instrument [Line Items]    
2019 $ 8,500  
2020 $ 7,078  
Interest Rate [1] 2.26%  
Notes Payable to Banks [Member]    
Debt Instrument [Line Items]    
2019 $ 70,551  
2020 $ 2,164  
Interest Rate [1] 4.19%  
Bank Holding Company Accounting [Member]    
Debt Instrument [Line Items]    
Long term debt $ 1,226,342  
Bank Holding Company Accounting [Member] | Deposits [Member]    
Debt Instrument [Line Items]    
Long term debt 896,402  
Bank Holding Company Accounting [Member] | DZ Loan [Member]    
Debt Instrument [Line Items]    
Long term debt 96,925  
Bank Holding Company Accounting [Member] | Small Business Administration Debentures and Borrowings [Member]    
Debt Instrument [Line Items]    
Long term debt 78,097  
Bank Holding Company Accounting [Member] | Retail Notes [Member]    
Debt Instrument [Line Items]    
Long term debt 33,625  
Bank Holding Company Accounting [Member] | Preferred Securities [Member]    
Debt Instrument [Line Items]    
Long term debt 33,000  
Bank Holding Company Accounting [Member] | Other Borrowings [Member]    
Debt Instrument [Line Items]    
Long term debt 15,578  
Bank Holding Company Accounting [Member] | Notes Payable to Banks [Member]    
Debt Instrument [Line Items]    
Long term debt $ 72,715  
Investment Company Accounting [Member]    
Debt Instrument [Line Items]    
Funds borrowed   $ 327,623
Investment Company Accounting [Member] | DZ Loan [Member]    
Debt Instrument [Line Items]    
Funds borrowed   99,984
Investment Company Accounting [Member] | Small Business Administration Debentures and Borrowings [Member]    
Debt Instrument [Line Items]    
Funds borrowed   79,564
Investment Company Accounting [Member] | Retail Notes [Member]    
Debt Instrument [Line Items]    
Funds borrowed   33,625
Investment Company Accounting [Member] | Preferred Securities [Member]    
Debt Instrument [Line Items]    
Funds borrowed   33,000
Investment Company Accounting [Member] | Notes Payable to Banks [Member]    
Debt Instrument [Line Items]    
Funds borrowed   $ 81,450
[1] Weighted average contractual rate as of June 30, 2018.