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Fair Value - Carrying Amounts and Estimated Fair Values of Financial Instrument (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents $ 35,095 $ 56,829
Interest-bearing deposits 3,750 5,245
Available-for-sale securities 95,732 130,810
Held-to-maturity securities 465,709 310,539
Loans held for sale 4,830 3,504
Loans, net of allowance for loan losses 1,377,173 954,849
Federal Reserve Bank and Federal Home Loan Bank stock 16,652 11,013
Interest receivable 6,991 4,540
Derivative Assets 1 2
Cash collateral held by derivative counterparty 151 24
Total assets 2,192,192 1,585,727
Deposits 1,630,451 1,215,914
Federal funds purchased and retail repurchase agreements 20,637 20,762
Federal Home Loan Bank advances 259,588 145,439
Bank stock loan 0 18,612
Subordinated debentures 13,684 9,251
Contractual obligations 2,504 3,093
Derivative Liabilities 39 246
Total liabilities 1,934,228 1,418,494
Carrying Amount [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 35,095 56,829
Interest-bearing deposits 3,750 5,245
Available-for-sale securities 95,732 130,810
Held-to-maturity securities 465,709 310,539
Loans held for sale 4,830 3,504
Loans, net of allowance for loan losses 1,377,173 954,849
Federal Reserve Bank and Federal Home Loan Bank stock 16,652 11,013
Interest receivable 6,991 4,540
Derivative Assets 1 2
Cash collateral held by derivative counterparty 151 24
Total derivative assets 152 26
Total assets 2,006,084 1,477,355
Deposits 1,630,451 1,215,914
Federal funds purchased and retail repurchase agreements 20,637 20,762
Federal Home Loan Bank advances 259,588 145,439
Bank stock loan   18,612
Subordinated debentures 13,684 9,251
Contractual obligations 2,504 3,093
Interest payable 728 737
Derivative Liabilities 39 246
Cash collateral held by counterparty (39) (246)
Total liabilities 1,927,592 1,413,808
Estimated Fair Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 35,095 56,829
Interest-bearing deposits 3,750 5,245
Available-for-sale securities 95,732 130,810
Held-to-maturity securities 461,156 312,802
Loans held for sale 4,830 3,504
Loans, net of allowance for loan losses 1,374,700 957,039
Interest receivable 6,991 4,540
Derivative Assets 1 2
Cash collateral held by derivative counterparty 151  
Cash collateral held by derivative counterparty   24
Total derivative assets 152 26
Total assets 1,982,406 1,470,795
Deposits 1,635,881 1,220,657
Federal funds purchased and retail repurchase agreements 20,637 20,762
Federal Home Loan Bank advances 259,588 145,439
Bank stock loan   18,612
Subordinated debentures 13,684 9,251
Contractual obligations 2,504 3,093
Interest payable 728 737
Derivative Liabilities 39 246
Cash collateral held by counterparty (39) (246)
Total liabilities 1,933,022 1,418,551
Estimated Fair Value [Member] | Level 1 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 35,095 56,829
Available-for-sale securities 486  
Cash collateral held by derivative counterparty 151  
Cash collateral held by derivative counterparty   24
Total derivative assets 151 24
Total assets 35,732 56,853
Cash collateral held by counterparty (39) (246)
Total derivative liabilities (39) (246)
Total liabilities (39) (246)
Estimated Fair Value [Member] | Level 2 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Interest-bearing deposits 3,750 5,245
Available-for-sale securities 95,246 130,810
Held-to-maturity securities 461,156 312,802
Loans held for sale 4,830 3,504
Interest receivable 6,991 4,540
Derivative Assets 1 2
Total derivative assets 1 2
Total assets 571,974 456,903
Deposits 1,635,881 1,220,657
Federal funds purchased and retail repurchase agreements 20,637 20,762
Federal Home Loan Bank advances 259,588 145,439
Bank stock loan   18,612
Subordinated debentures 13,684 9,251
Contractual obligations 2,504 3,093
Interest payable 728 737
Derivative Liabilities 39 246
Total derivative liabilities 39 246
Total liabilities 1,933,061 1,418,797
Estimated Fair Value [Member] | Level 3 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans, net of allowance for loan losses 1,374,700 957,039
Total assets $ 1,374,700 $ 957,039