Fair Value (Carrying Amounts and Estimated Fair Value for Financial Instrument Assets and Liabilities) (Details) - USD ($) $ in Thousands		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Financial assets:
Cash and due from banks		$ 102,971	$ 87,707
AFS securities		789,899	779,867
HTM securities		94,073	94,609
Held-to-maturity Securities, Fair Value		94,913	94,596
Loans Held-for-sale, Fair Value Disclosure		8,103	14,836
Servicing Asset at Fair Value, Amount		1,766	1,701	$ 2,947	$ 1,447
Interest Receivable Fair Value Disclosure		9,595	8,654
Financial liabilities:
Deposits		2,995,269	2,826,484
Federal Home Loan Bank Borrowings, Fair Value Disclosure		541,683	530,435
Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure		10,699	10,836
Subordinated debentures		44,333	41,660
Interest payable		564	534
Readily Available Market Prices (Level 1) [Member]
Financial assets:
Cash and due from banks		102,971	87,707
AFS securities		0	0
Held-to-maturity Securities, Fair Value		0	0
Loans Held-for-sale, Fair Value Disclosure		0	0
Servicing Asset at Fair Value, Amount		0	0
Interest Receivable Fair Value Disclosure		0	0
Financial liabilities:
Deposits		0	0
Federal Home Loan Bank Borrowings, Fair Value Disclosure		0	0
Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure		0	0
Subordinated debentures		0	0
Interest payable		0	0
Observable Market Data (Level 2) [Member]
Financial assets:
Cash and due from banks		0	0
AFS securities		789,899	779,867
Held-to-maturity Securities, Fair Value		94,913	94,596
Loans Held-for-sale, Fair Value Disclosure		8,103	14,836
Servicing Asset at Fair Value, Amount		1,766	1,701
Interest Receivable Fair Value Disclosure		9,595	8,654
Financial liabilities:
Deposits		2,995,269	2,826,484
Federal Home Loan Bank Borrowings, Fair Value Disclosure		541,683	530,435
Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure		10,699	10,836
Subordinated debentures		44,333	41,660
Interest payable		564	534
Company Determined Fair Value (Level 3) [Member]
Financial assets:
Cash and due from banks		0	0
AFS securities		0	0
Held-to-maturity Securities, Fair Value		0	0
Loans Held-for-sale, Fair Value Disclosure		0	0
Servicing Asset at Fair Value, Amount		0	0
Interest Receivable Fair Value Disclosure		0	0
Financial liabilities:
Deposits		0	0
Federal Home Loan Bank Borrowings, Fair Value Disclosure		0	0
Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure		0	0
Subordinated debentures		0	0
Interest payable		0	0
Carrying Amount [Member]
Financial assets:
Cash and due from banks		102,971	87,707
AFS securities		789,899	779,867
HTM securities		94,073	94,609
Loans Held-for-sale, Fair Value Disclosure		8,103	14,836
Servicing Asset at Fair Value, Amount		1,025	1,210
Interest Receivable Fair Value Disclosure		9,595	8,654
Financial liabilities:
Deposits		3,000,491	2,828,529
Federal Home Loan Bank Borrowings, Fair Value Disclosure		541,867	530,129
Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure		10,720	10,791
Subordinated debentures		58,911	58,755
Interest payable		564	534
Residential real estate loans
Financial assets:
Loans receivable, net of allowance	[1]	853,056	800,122
Residential real estate loans | Readily Available Market Prices (Level 1) [Member]
Financial assets:
Loans receivable, net of allowance	[1]	0	0
Residential real estate loans | Observable Market Data (Level 2) [Member]
Financial assets:
Loans receivable, net of allowance	[1]	0	0
Residential real estate loans | Company Determined Fair Value (Level 3) [Member]
Financial assets:
Loans receivable, net of allowance	[1]	853,056	800,122
Residential real estate loans | Carrying Amount [Member]
Financial assets:
Loans receivable, net of allowance	[1]	853,283	798,334
Commercial real estate loans
Financial assets:
Loans receivable, net of allowance	[1]	1,115,618	1,006,249
Commercial real estate loans | Readily Available Market Prices (Level 1) [Member]
Financial assets:
Loans receivable, net of allowance	[1]	0	0
Commercial real estate loans | Observable Market Data (Level 2) [Member]
Financial assets:
Loans receivable, net of allowance	[1]	0	0
Commercial real estate loans | Company Determined Fair Value (Level 3) [Member]
Financial assets:
Loans receivable, net of allowance	[1]	1,115,618	1,006,249
Commercial real estate loans | Carrying Amount [Member]
Financial assets:
Loans receivable, net of allowance	[1]	1,152,160	1,038,626
Commercial loans
Financial assets:
Loans receivable, net of allowance	[1],[2]	401,902	391,493
Commercial loans | Readily Available Market Prices (Level 1) [Member]
Financial assets:
Loans receivable, net of allowance	[1],[2]	0	0
Commercial loans | Observable Market Data (Level 2) [Member]
Financial assets:
Loans receivable, net of allowance	[1],[2]	0	0
Commercial loans | Company Determined Fair Value (Level 3) [Member]
Financial assets:
Loans receivable, net of allowance	[1],[2]	401,902	391,493
Commercial loans | Carrying Amount [Member]
Financial assets:
Loans receivable, net of allowance	[1],[2]	413,898	389,624
Home equity loans
Financial assets:
Loans receivable, net of allowance	[1]	318,230	327,292
Home equity loans | Readily Available Market Prices (Level 1) [Member]
Financial assets:
Loans receivable, net of allowance	[1]	0	0
Home equity loans | Observable Market Data (Level 2) [Member]
Financial assets:
Loans receivable, net of allowance	[1]	0	0
Home equity loans | Company Determined Fair Value (Level 3) [Member]
Financial assets:
Loans receivable, net of allowance	[1]	318,230	327,292
Home equity loans | Carrying Amount [Member]
Financial assets:
Loans receivable, net of allowance	[1]	321,011	327,713
Consumer loans
Financial assets:
Loans receivable, net of allowance	[1]	17,335	16,845
Consumer loans | Readily Available Market Prices (Level 1) [Member]
Financial assets:
Loans receivable, net of allowance	[1]	0	0
Consumer loans | Observable Market Data (Level 2) [Member]
Financial assets:
Loans receivable, net of allowance	[1]	0	0
Consumer loans | Company Determined Fair Value (Level 3) [Member]
Financial assets:
Loans receivable, net of allowance	[1]	17,335	16,845
Consumer loans | Carrying Amount [Member]
Financial assets:
Loans receivable, net of allowance	[1]	17,916	17,151
Fair Value, Measurements, Recurring [Member]
Financial liabilities:
Junior subordinated debt interest rate swaps		7,571	8,372
Fair Value, Measurements, Recurring [Member] | Observable Market Data (Level 2) [Member]
Financial liabilities:
Junior subordinated debt interest rate swaps		7,571	8,372
Forward-Starting Interest Rate Swap [Member]
Financial liabilities:
Junior subordinated debt interest rate swaps			389
Forward-Starting Interest Rate Swap [Member] | Readily Available Market Prices (Level 1) [Member]
Financial liabilities:
Junior subordinated debt interest rate swaps			0
Forward-Starting Interest Rate Swap [Member] | Observable Market Data (Level 2) [Member]
Financial liabilities:
Junior subordinated debt interest rate swaps			389
Forward-Starting Interest Rate Swap [Member] | Company Determined Fair Value (Level 3) [Member]
Financial liabilities:
Junior subordinated debt interest rate swaps			0
Forward-Starting Interest Rate Swap [Member] | Carrying Amount [Member]
Financial liabilities:
Junior subordinated debt interest rate swaps			389
Forward-Starting Interest Rate Swap [Member] | Fair Value, Measurements, Recurring [Member]
Financial liabilities:
Junior subordinated debt interest rate swaps		21	389
Forward-Starting Interest Rate Swap [Member] | Fair Value, Measurements, Recurring [Member] | Observable Market Data (Level 2) [Member]
Financial liabilities:
Junior subordinated debt interest rate swaps		21	389
Interest Rate Swap [Member]
Financial assets:
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value		5,036	1,945
Financial liabilities:
Junior subordinated debt interest rate swaps		7,571	8,372
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value		5,036	1,945
Interest Rate Swap [Member] | Readily Available Market Prices (Level 1) [Member]
Financial assets:
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value		0	0
Financial liabilities:
Junior subordinated debt interest rate swaps		0	0
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value		0	0
Interest Rate Swap [Member] | Observable Market Data (Level 2) [Member]
Financial assets:
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value		5,036	1,945
Financial liabilities:
Junior subordinated debt interest rate swaps		7,571	8,372
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value		5,036	1,945
Interest Rate Swap [Member] | Company Determined Fair Value (Level 3) [Member]
Financial assets:
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value		0	0
Financial liabilities:
Junior subordinated debt interest rate swaps		0	0
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value		0	0
Interest Rate Swap [Member] | Carrying Amount [Member]
Financial assets:
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value		5,036	1,945
Financial liabilities:
Junior subordinated debt interest rate swaps		7,571	8,372
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value		5,036	1,945
Interest Rate Swap [Member] | Fair Value, Measurements, Recurring [Member]
Financial assets:
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value		5,036	1,945
Financial liabilities:
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value		5,036	1,945
Interest Rate Swap [Member] | Fair Value, Measurements, Recurring [Member] | Observable Market Data (Level 2) [Member]
Financial assets:
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value		5,036	1,945
Financial liabilities:
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value		5,036	1,945
Interest Rate Lock Commitments [Member]
Financial assets:
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value		307	202
Financial liabilities:
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value		22	15
Interest Rate Lock Commitments [Member] | Readily Available Market Prices (Level 1) [Member]
Financial assets:
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value		0	0
Financial liabilities:
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value		0	0
Interest Rate Lock Commitments [Member] | Observable Market Data (Level 2) [Member]
Financial assets:
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value		307	202
Financial liabilities:
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value		22	15
Interest Rate Lock Commitments [Member] | Company Determined Fair Value (Level 3) [Member]
Financial assets:
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value		0	0
Financial liabilities:
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value		0	0
Interest Rate Lock Commitments [Member] | Carrying Amount [Member]
Financial assets:
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value		307	202
Financial liabilities:
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value		22	15
Interest Rate Lock Commitments [Member] | Fair Value, Measurements, Recurring [Member]
Financial assets:
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value		307	202
Financial liabilities:
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value		22	15
Interest Rate Lock Commitments [Member] | Fair Value, Measurements, Recurring [Member] | Observable Market Data (Level 2) [Member]
Financial assets:
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value		307	202
Financial liabilities:
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value		22	15
Interest Rate Lock Commitments [Member] | Fair Value, Measurements, Recurring [Member] | Company Determined Fair Value (Level 3) [Member]
Financial liabilities:
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value		0	0
Forward Contracts [Member]
Financial assets:
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value		158	587
Financial liabilities:
Junior subordinated debt interest rate swaps		21
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value		16	309
Forward Contracts [Member] | Readily Available Market Prices (Level 1) [Member]
Financial assets:
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value		0	0
Financial liabilities:
Junior subordinated debt interest rate swaps		0
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value		0	0
Forward Contracts [Member] | Observable Market Data (Level 2) [Member]
Financial assets:
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value		158	587
Financial liabilities:
Junior subordinated debt interest rate swaps		21
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value		16	309
Forward Contracts [Member] | Company Determined Fair Value (Level 3) [Member]
Financial assets:
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value		0	0
Financial liabilities:
Junior subordinated debt interest rate swaps		0
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value		0	0
Forward Contracts [Member] | Carrying Amount [Member]
Financial assets:
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value		158	587
Financial liabilities:
Junior subordinated debt interest rate swaps		21
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value		16	309
Forward Contracts [Member] | Fair Value, Measurements, Recurring [Member]
Financial assets:
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value		158	587
Financial liabilities:
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value		16	309
Forward Contracts [Member] | Fair Value, Measurements, Recurring [Member] | Observable Market Data (Level 2) [Member]
Financial assets:
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value		158	587
Financial liabilities:
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value		$ 16	$ 309

[1] (1)The presented carrying amount is net of the allocated ALL.

[2] (2)Includes the HPFC loan portfolio.