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Fair Value of Financial Instruments - Carrying Amount and Fair Value of Company's Financial Instruments (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents, carrying value $ 75,267 $ 147,273 $ 143,396 $ 228,536
Investment securities available for sale, carrying value 341,523 294,599    
Investment securities held to maturity, carrying value 15,492 0    
Investment securities held to maturity, fair value 15,422 0    
Loans held for sale, carrying value 10,323 6,594    
Loans held for investment, net, carrying value 1,614,953 1,524,439    
Mortgage servicing rights, carrying value 18,942 19,404    
Federal Home Loan Bank stock, carrying value 11,940 11,940    
Accrued interest receivable, carrying value 7,827 7,627    
Non-maturity deposits, carrying value 1,450,404 1,366,958    
Deposits with stated maturities, carrying value 390,320 447,213    
Other borrowed funds, carrying value 12,562 13,752    
Accrued interest payable, carrying value 325 316    
Cash and cash equivalents, fair value 75,267 147,273    
Loans held for sale, fair value 10,323 6,594    
Loans held for investment, net, fair value 1,579,582 1,496,791    
Mortgage servicing rights, fair value 19,252 19,590    
Federal Home Loan Bank stock, fair value 11,940 11,940    
Accrued interest receivable, fair value 7,827 7,627    
Non-maturity deposits, fair value 1,450,404 1,366,958    
Deposits with stated maturities, fair value 388,285 445,938    
Other borrowed funds, fair value 12,837 14,077    
Accrued interest payable, fair value 325 316    
Fair Value        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Investment securities available for sale, carrying value 341,523 294,599    
Carrying Amount        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Investment securities available for sale, carrying value 341,523 294,599    
Interest rate lock commitments | Fair Value        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Financial assets 189 154    
Financial liabilities 6 14    
Interest rate lock commitments | Carrying Amount        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Financial assets 189 154    
Financial liabilities 6 14    
Unused commitments | Fair Value        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Financial assets 0 0    
Financial liabilities 0 0    
Unused commitments | Carrying Amount        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Financial assets 0 0    
Financial liabilities 0 0    
Forward contracts to sell mortgage loans | Fair Value        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Financial assets 0 2    
Financial liabilities 90 174    
Forward contracts to sell mortgage loans | Carrying Amount        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Financial assets 0 2    
Financial liabilities 90 174    
Interest rate swap contacts | Fair Value        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Financial assets 2,081 0    
Financial liabilities 2,081 0    
Interest rate swap contacts | Carrying Amount        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Financial assets 2,081 0    
Financial liabilities $ 2,081 $ 0