Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020
Assets [Abstract]
Investment Securities Available-for-Sale	$ 333,151	$ 807,732	$ 568,536
Carrying Amount [Member]
Assets [Abstract]
Cash and Cash Equivalents	870,763	383,837	358,368
Investment Securities Available-for-Sale	333,151	807,732	568,536
Investment Securities Held-to-Maturity	550,618	68,933	69,913
Loans & Leases, Net	3,079,498	3,040,730	3,055,133
Accrued Interest Receivable	18,762	20,333	22,596
Liabilities [Abstract]
Deposits	4,568,394	4,060,267	3,814,777
Subordinated Debentures	10,310	10,310	10,310
Accrued Interest Payable	451	1,383	1,618
Estimated Fair Value [Member]
Assets [Abstract]
Cash and Cash Equivalents	870,763	383,837	358,368
Investment Securities Available-for-Sale	333,151	807,732	568,536
Investment Securities Held-to-Maturity	540,308	70,049	71,055
Loans & Leases, Net	3,090,187	3,045,911	3,065,624
Accrued Interest Receivable	18,762	20,333	22,596
Liabilities [Abstract]
Deposits	4,568,719	4,061,240	3,816,282
Subordinated Debentures	6,830	6,888	6,518
Accrued Interest Payable	451	1,383	1,618
Estimated Fair Value [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets [Abstract]
Cash and Cash Equivalents	870,763	383,837	358,368
Investment Securities Available-for-Sale	56,353	15,470	95,460
Investment Securities Held-to-Maturity	0	0	0
Loans & Leases, Net	0	0	0
Accrued Interest Receivable	0	0	0
Liabilities [Abstract]
Deposits	4,174,561	3,638,400	3,354,528
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	276,798	792,262	473,076
Investment Securities Held-to-Maturity	499,432	26,262	28,244
Loans & Leases, Net	0	0	0
Accrued Interest Receivable	18,762	20,333	22,596
Liabilities [Abstract]
Deposits	0	0	0
Subordinated Debentures	6,830	6,888	6,518
Accrued Interest Payable	451	1,383	1,618
Estimated Fair Value [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets [Abstract]
Cash and Cash Equivalents	0	0	0
Investment Securities Available-for-Sale	0	0	0
Investment Securities Held-to-Maturity	40,876	43,787	42,811
Loans & Leases, Net	3,090,187	3,045,911	3,065,624
Accrued Interest Receivable	0	0	0
Liabilities [Abstract]
Deposits	394,158	422,840	461,754
Subordinated Debentures	0	0	0
Accrued Interest Payable	$ 0	$ 0	$ 0