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Fair Value of Assets and Liabilities - Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Financial assets (recorded at amortized cost)    
Investment securities held-to-maturity $ 145,118 $ 153,894
Carrying Amounts | Level 1    
Financial assets (recorded at amortized cost)    
Cash and cash equivalents 182,486 34,221
Financial liabilities (recorded at amortized cost)    
Federal Home Loan Bank overnight borrowings 0 7,000
Carrying Amounts | Level 2    
Financial assets (recorded at amortized cost)    
Investment securities held-to-maturity 142,213 157,206
Interest receivable 7,037 8,292
Financial liabilities (recorded at amortized cost)    
Time deposits 98,077 117,182
Interest payable 120 104
Carrying Amounts | Level 3    
Financial assets (recorded at amortized cost)    
Loans, net 1,782,450 1,748,043
Financial liabilities (recorded at amortized cost)    
Subordinated debentures 2,691 2,640
Fair Value | Level 1    
Financial assets (recorded at amortized cost)    
Cash and cash equivalents 182,486 34,221
Financial liabilities (recorded at amortized cost)    
Federal Home Loan Bank overnight borrowings 0 7,000
Fair Value | Level 2    
Financial assets (recorded at amortized cost)    
Investment securities held-to-maturity 145,118 153,894
Interest receivable 7,037 8,292
Financial liabilities (recorded at amortized cost)    
Time deposits 97,150 116,584
Interest payable 120 104
Fair Value | Level 3    
Financial assets (recorded at amortized cost)    
Loans, net 1,792,192 1,700,971
Financial liabilities (recorded at amortized cost)    
Subordinated debentures $ 3,094 $ 3,268