Shareholders' Equity (Schedule of Consolidated and Affiliate Bank Actual Capital and Minimum Required Levels) (Details) - USD ($) $ in Thousands			12 Months Ended
		Jan. 01, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2015
Bank
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Minimum Capital Required for Capital Adequacy Ratio, Capital Conservation Buffer					0.00%
Maximum Capital Required for Capital Adequacy Ratio, Capital Conservation Buffer		2.50%
Actual Capital Required for Capital Adequacy Ratio, Capital Conservation Buffer			2.50%	1.875%
Total Capital (to Risk Weighted Assets)
Actual Amount of Total Capital (to Risk Weighted Assets)			$ 447,090	$ 381,294
Actual Ratio of Total Capital (to Risk Weighted Assets)			12.82%	12.37%
Minimum Required For Capital Adequacy Purposes: Amount, Total Capital			$ 278,997	$ 246,594
Minimum Required For Capital Adequacy Purposes: Ratio, Total Capital (to Risk Weighted Assets)	[1]		8.00%	8.00%
Minimum Required To Be Well-Capitalized Under Prompt Corrective Action Regulations: Amount, Total Capital (to Risk Weighted Assets)			$ 348,746	$ 308,242
Minimum Required To Be Well-Capitalized Under Prompt Corrective Action Regulations: Ratio, Total Capital (to Risk Weighted Assets)			10.00%	10.00%
Tier 1 (Core) Capital (to Risk Weighted Assets)
Actual Amount of Tier 1 Capital (to Risk Weighted Assets)			$ 430,812	$ 365,471
Actual Ratio of Tier 1 Capital (to Risk Weighted Assets)			12.35%	11.86%
Minimum Required For Capital Adequacy Purposes: Amount, Tier 1 Capital (to Risk Weighted Assets)			$ 209,248	$ 184,945
Minimum Required For Capital Adequacy Purposes: Ratio, Tier 1 Capital (to Risk Weighted Assets)	[1]		6.00%	6.00%
Minimum Required To Be Well-Capitalized Under Prompt Corrective Action Regulations: Amount, Tier 1 Capital (to Risk Weighted Assets)			$ 278,997	$ 246,594
Minimum Required To Be Well-Capitalized Under Prompt Corrective Action Regulations: Ratio, Tier 1 Capital (to Risk Weighted Assets)			8.00%	8.00%
Common Equity Tier 1 (CET 1) Capital Ratio (to Risk Weighted Assets)
Actual Amount of Common Tier 1 Capital (to Risk Weighted Assets)			$ 430,812	$ 365,471
Actual Ratio of Common Tier 1 Capital (to Risk Weighted Assets)			12.35%	11.86%
Minimum Required For Capital Adequacy Purposes: Amount, Common Tier 1 Capital (to Risk Weighted Assets)			$ 156,936	$ 138,709
Minimum Required For Capital Adequacy Purposes: Ratio, Common Tier 1 Capital (to Risk Weighted Assets)	[1]		4.50%	4.50%
Minimum Required To Be Well-Capitalized Under Prompt Corrective Action Regulations: Amount, Common Tier 1 Capital (to Risk Weighted Assets)			$ 226,685	$ 200,357
Minimum Required To Be Well-Capitalized Under Prompt Corrective Action Regulations: Ratio, Common Tier 1 Capital (to Risk Weighted Assets)			6.50%	6.50%
Tier 1 (Core) Capital (to Average Assets)
Actual Amount of Tier 1 Capital (to Average Assets)			$ 430,812	$ 365,471
Actual Ratio of Tier 1 Capital (to Average Assets)			10.27%	9.78%
Minimum Required For Capital Adequacy Purposes: Amount, Tier 1 Capital (to Average Assets)			$ 167,765	$ 149,484
Minimum Required For Capital Adequacy Purposes: Ratio, Tier 1 Capital (to Average Assets)	[1]		4.00%	4.00%
Minimum Required To Be Well-Capitalized Under Prompt Corrective Action Regulations: Amount, Tier 1 Capital (to Average Assets)			$ 209,706	$ 186,854
Minimum Required To Be Well-Capitalized Under Prompt Corrective Action Regulations: Ratio, Tier 1 Capital (to Average Assets)			5.00%	5.00%
Consolidated
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Minimum Capital Required for Capital Adequacy Ratio, Capital Conservation Buffer					0.00%
Maximum Capital Required for Capital Adequacy Ratio, Capital Conservation Buffer		2.50%
Actual Capital Required for Capital Adequacy Ratio, Capital Conservation Buffer			2.50%	1.875%
Total Capital (to Risk Weighted Assets)
Actual Amount of Total Capital (to Risk Weighted Assets)			$ 499,020	$ 381,385
Actual Ratio of Total Capital (to Risk Weighted Assets)			14.28%	12.36%
Minimum Required For Capital Adequacy Purposes: Amount, Total Capital			$ 279,499	$ 246,805
Minimum Required For Capital Adequacy Purposes: Ratio, Total Capital (to Risk Weighted Assets)	[1]		8.00%	8.00%
Tier 1 (Core) Capital (to Risk Weighted Assets)
Actual Amount of Tier 1 Capital (to Risk Weighted Assets)			$ 442,742	$ 365,562
Actual Ratio of Tier 1 Capital (to Risk Weighted Assets)			12.67%	11.85%
Minimum Required For Capital Adequacy Purposes: Amount, Tier 1 Capital (to Risk Weighted Assets)			$ 209,624	$ 185,104
Minimum Required For Capital Adequacy Purposes: Ratio, Tier 1 Capital (to Risk Weighted Assets)	[1]		6.00%	6.00%
Common Equity Tier 1 (CET 1) Capital Ratio (to Risk Weighted Assets)
Actual Amount of Common Tier 1 Capital (to Risk Weighted Assets)			$ 427,295	$ 354,251
Actual Ratio of Common Tier 1 Capital (to Risk Weighted Assets)			12.23%	11.48%
Minimum Required For Capital Adequacy Purposes: Amount, Common Tier 1 Capital (to Risk Weighted Assets)			$ 157,218	$ 138,828
Minimum Required For Capital Adequacy Purposes: Ratio, Common Tier 1 Capital (to Risk Weighted Assets)	[1]		4.50%	4.50%
Tier 1 (Core) Capital (to Average Assets)
Actual Amount of Tier 1 Capital (to Average Assets)			$ 442,742	$ 365,562
Actual Ratio of Tier 1 Capital (to Average Assets)			10.53%	9.75%
Minimum Required For Capital Adequacy Purposes: Amount, Tier 1 Capital (to Average Assets)			$ 168,195	$ 149,917
Minimum Required For Capital Adequacy Purposes: Ratio, Tier 1 Capital (to Average Assets)	[1]		4.00%	4.00%

[1] Excludes capital conservation buffer.