Modification which Occurred During the Period & Change in Recorded Investment (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) contract	Dec. 31, 2017 USD ($) contract	Dec. 31, 2016 USD ($) contract
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract	29	54	50
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 38,898	$ 8,130	$ 7,663
TROUBLED DEBT RESTRUCTURINGS:
Post-Modification Outstanding Recorded Investment	$ 42,457	$ 8,175	$ 7,705
Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract	12	12	10
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 35,688	$ 1,787	$ 1,623
TROUBLED DEBT RESTRUCTURINGS:
Post-Modification Outstanding Recorded Investment	$ 39,224	$ 1,787	$ 1,623
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract	3	6	10
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 1,600	$ 2,705	$ 2,959
TROUBLED DEBT RESTRUCTURINGS:
Post-Modification Outstanding Recorded Investment	$ 1,600	$ 2,705	$ 2,959
Small Business [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract		9	3
Financing Receivable, Modifications, Pre-Modification Recorded Investment		$ 369	$ 188
TROUBLED DEBT RESTRUCTURINGS:
Post-Modification Outstanding Recorded Investment		$ 369	$ 188
Residential Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract	5	10	8
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 1,048	$ 1,284	$ 1,808
TROUBLED DEBT RESTRUCTURINGS:
Post-Modification Outstanding Recorded Investment	$ 1,071	$ 1,326	$ 1,850
Home Equity Line of Credit [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract	9	17	13
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 562	$ 1,985	$ 932
TROUBLED DEBT RESTRUCTURINGS:
Post-Modification Outstanding Recorded Investment	$ 562	$ 1,988	$ 932
Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract			6
Financing Receivable, Modifications, Pre-Modification Recorded Investment			$ 153
TROUBLED DEBT RESTRUCTURINGS:
Post-Modification Outstanding Recorded Investment			$ 153