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Carrying Amount and Fair Value of Financial Instruments (Detail) - USD ($)
$ in Thousands
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Assets            
Securities available for sale $ 322,699   $ 366,173      
Securities held to maturity 72,806   72,490      
FDIC indemnification asset 16,431 $ 18,787 20,844 $ 23,653 $ 26,053 $ 27,900
Interest receivable 6,115   6,007      
Liabilities            
Derivative financial liabilities 494   251      
Carrying (Reported) Amount, Fair Value Disclosure            
Assets            
Cash and cash equivalents 44,301   51,787      
Securities available for sale 322,699   366,173      
Securities held to maturity 72,239   72,541      
Loans held for investment, net of allowance 1,780,884   1,686,308      
FDIC indemnification asset 16,431   20,844      
Interest receivable 6,115   6,007      
Deferred compensation assets 3,866   3,464      
Liabilities            
Federal funds purchased 42,000          
Securities sold under agreements to repurchase 113,392   138,614      
Interest payable 1,256   1,260      
FHLB and other borrowings 155,756   80,756      
Derivative financial liabilities 494   251      
Deferred compensation liabilities 3,866   3,464      
Carrying (Reported) Amount, Fair Value Disclosure | Demand Deposits            
Liabilities            
Deposits Fair Value 451,003   451,511      
Carrying (Reported) Amount, Fair Value Disclosure | Interest-bearing Deposits            
Liabilities            
Deposits Fair Value 334,894   347,705      
Carrying (Reported) Amount, Fair Value Disclosure | Savings Deposits            
Liabilities            
Deposits Fair Value 523,056   530,585      
Carrying (Reported) Amount, Fair Value Disclosure | Bank Time Deposits            
Liabilities            
Deposits Fair Value 515,462   543,458      
Estimate of Fair Value, Fair Value Disclosure            
Assets            
Cash and cash equivalents 44,301   51,787      
Securities available for sale 322,699   366,173      
Securities held to maturity 72,806   72,490      
Loans held for investment, net of allowance 1,785,958   1,685,061      
FDIC indemnification asset 8,498   10,753      
Interest receivable 6,115   6,007      
Deferred compensation assets 3,866   3,464      
Liabilities            
Federal funds purchased 42,000          
Securities sold under agreements to repurchase 115,470   140,880      
Interest payable 1,256   1,260      
FHLB and other borrowings 161,456   85,774      
Derivative financial liabilities 494   251      
Deferred compensation liabilities 3,866   3,464      
Estimate of Fair Value, Fair Value Disclosure | Demand Deposits            
Liabilities            
Deposits Fair Value 451,003   451,511      
Estimate of Fair Value, Fair Value Disclosure | Interest-bearing Deposits            
Liabilities            
Deposits Fair Value 334,894   347,705      
Estimate of Fair Value, Fair Value Disclosure | Savings Deposits            
Liabilities            
Deposits Fair Value 523,056   530,585      
Estimate of Fair Value, Fair Value Disclosure | Bank Time Deposits            
Liabilities            
Deposits Fair Value 517,216   541,059      
Level 1            
Assets            
Cash and cash equivalents 44,301   51,787      
Securities available for sale 55   54      
Deferred compensation assets 3,866   3,464      
Liabilities            
Federal funds purchased 42,000          
Deferred compensation liabilities 3,866   3,464      
Level 2            
Assets            
Securities available for sale 322,644   366,119      
Securities held to maturity 72,806   72,490      
Loans held for investment, net of allowance 4,990   4,886      
Interest receivable 6,115   6,007      
Liabilities            
Securities sold under agreements to repurchase 115,470   140,880      
Interest payable 1,256   1,260      
FHLB and other borrowings 161,456   85,774      
Derivative financial liabilities 494   251      
Level 2 | Demand Deposits            
Liabilities            
Deposits Fair Value 451,003   451,511      
Level 2 | Interest-bearing Deposits            
Liabilities            
Deposits Fair Value 334,894   347,705      
Level 2 | Savings Deposits            
Liabilities            
Deposits Fair Value 523,056   530,585      
Level 2 | Bank Time Deposits            
Liabilities            
Deposits Fair Value 517,216   541,059      
Level 3            
Assets            
Loans held for investment, net of allowance 1,780,968   1,680,175      
FDIC indemnification asset $ 8,498   $ 10,753