Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017
Assets [Abstract]
Investment Securities Available-for-Sale	$ 495,814	$ 481,596	$ 452,842
Investment Securities Held-to-Maturity	53,745	55,236	57,673
Carrying Amount [Member]
Assets [Abstract]
Cash and Cash Equivalents	134,984	187,149	164,512
Investment Securities Available-for-Sale	495,814	481,596	452,842
Investment Securities Held-to-Maturity	53,527	54,460	57,281
FHLB Stock	10,342	10,342	8,872
Loans & Leases, Net of Deferred Fees & Allowance	2,184,406	2,164,953	2,097,632
Accrued Interest Receivable	9,237	10,999	7,962
Liabilities [Abstract]
Deposits	2,701,405	2,723,228	2,607,613
Subordinated Debentures	10,310	10,310	10,310
Accrued Interest Payable	909	1,137	882
Estimated Fair Value [Member]
Assets [Abstract]
Cash and Cash Equivalents	134,984	187,149	164,512
Investment Securities Available-for-Sale	495,814	481,596	452,842
Investment Securities Held-to-Maturity	53,745	55,236	57,673
Loans & Leases, Net of Deferred Fees & Allowance	2,152,504	2,137,987	2,076,248
Accrued Interest Receivable	9,237	10,999	7,962
Liabilities [Abstract]
Deposits	2,697,488	2,720,502	2,605,780
Subordinated Debentures	7,751	7,428	6,581
Accrued Interest Payable	909	1,137	882
Estimated Fair Value [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets [Abstract]
Cash and Cash Equivalents	134,984	187,149	164,512
Investment Securities Available-for-Sale	143,609	29,580	104,619
Investment Securities Held-to-Maturity	0	0	0
Loans & Leases, Net of Deferred Fees & Allowance	0	0	0
Accrued Interest Receivable	0	0	0
Liabilities [Abstract]
Deposits	2,218,642	2,247,831	2,017,969
Subordinated Debentures	0	0	0
Accrued Interest Payable	0	0	0
Estimated Fair Value [Member] | Other Observable Inputs (Level 2) [Member]
Assets [Abstract]
Cash and Cash Equivalents	0	0	0
Investment Securities Available-for-Sale	349,705	449,516	347,723
Investment Securities Held-to-Maturity	37,028	38,492	39,991
Loans & Leases, Net of Deferred Fees & Allowance	0	0	0
Accrued Interest Receivable	9,237	10,999	7,962
Liabilities [Abstract]
Deposits	478,846	472,671	587,811
Subordinated Debentures	7,751	7,428	6,581
Accrued Interest Payable	909	1,137	882
Estimated Fair Value [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets [Abstract]
Cash and Cash Equivalents	0	0	0
Investment Securities Available-for-Sale	2,500	2,500	500
Investment Securities Held-to-Maturity	16,717	16,744	17,682
Loans & Leases, Net of Deferred Fees & Allowance	2,152,504	2,137,987	2,076,248
Accrued Interest Receivable	0	0	0
Liabilities [Abstract]
Deposits	0	0	0
Subordinated Debentures	0	0	0
Accrued Interest Payable	$ 0	$ 0	$ 0