Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017
Assets [Abstract]
Investment Securities Available-for-Sale	$ 458,311	$ 481,596	$ 456,323
Investment Securities Held-to-Maturity	51,382	55,236	56,291
Carrying Amount [Member]
Assets [Abstract]
Cash and Cash Equivalents	110,781	187,149	193,270
Investment Securities Available-for-Sale	458,311	481,596	456,323
Investment Securities Held-to-Maturity	51,459	54,460	55,542
FHLB Stock	10,877	10,342	10,342
Loans & Leases, Net of Deferred Fees & Allowance	2,363,535	2,164,953	2,166,035
Accrued Interest Receivable	14,612	10,999	11,498
Liabilities [Abstract]
Deposits	2,776,923	2,723,228	2,709,427
Subordinated Debentures	10,310	10,310	10,310
Accrued Interest Payable	1,227	1,137	939
Estimated Fair Value [Member]
Assets [Abstract]
Cash and Cash Equivalents	110,781	187,149	193,270
Investment Securities Available-for-Sale	458,311	481,596	456,323
Investment Securities Held-to-Maturity	51,379	55,236	56,291
Loans & Leases, Net of Deferred Fees & Allowance	2,317,185	2,137,987	2,148,524
Accrued Interest Receivable	14,612	10,999	11,498
Liabilities [Abstract]
Deposits	2,772,126	2,720,502	2,707,450
Subordinated Debentures	7,579	7,428	6,589
Accrued Interest Payable	1,227	1,137	939
Estimated Fair Value [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets [Abstract]
Cash and Cash Equivalents	110,781	187,149	193,270
Investment Securities Available-for-Sale	164,409	144,364	144,610
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	2,314,600	2,247,831	2,159,654
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	291,402	334,732	311,213
Investment Securities Held-to-Maturity	35,716	38,492	39,254
Loans & Leases, Net of Deferred Fees & Allowance	0	0	0
Accrued Interest Receivable	14,612	10,999	11,498
Liabilities [Abstract]
Deposits	457,526	472,671	547,796
Subordinated Debentures	7,579	7,428	6,589
Accrued Interest Payable	1,227	1,137	939
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	15,663	16,744	17,037
Loans & Leases, Net of Deferred Fees & Allowance	2,317,185	2,137,987	2,148,524
Accrued Interest Receivable	0	0	0
Liabilities [Abstract]
Deposits	0	0	0
Subordinated Debentures	0	0	0
Accrued Interest Payable	$ 0	$ 0	$ 0