Commitments, Contingencies and Concentrations of Credit Risk (Details) - Summary of Financial Instruments - USD ($) $ in Thousands |
Dec. 31, 2016 |
Dec. 31, 2015 |
|---|---|---|
| Supply Commitment [Line Items] | ||
| Off-balance sheet commitements | $ 603,112 | $ 625,609 |
| Commercial Portfolio Segment [Member] | Supply Commitment [Member] | ||
| Supply Commitment [Line Items] | ||
| Off-balance sheet commitements | 267,865 | 278,201 |
| Home Equity Line of Credit [Member] | ||
| Supply Commitment [Line Items] | ||
| Off-balance sheet commitements | 52,788 | 52,191 |
| Commercial Real Estate Portfolio Segment [Member] | Supply Commitment [Member] | ||
| Supply Commitment [Line Items] | ||
| Off-balance sheet commitements | 263,395 | 273,552 |
| Standby Letters of Credit [Member] | ||
| Supply Commitment [Line Items] | ||
| Off-balance sheet commitements | 18,331 | 20,895 |
| Overdraft Protection Lines [Member] | ||
| Supply Commitment [Line Items] | ||
| Off-balance sheet commitements | $ 733 | $ 770 |