Consolidated Statements of Income and Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Interest and Dividend Income:
Loans including fees	$ 139,867	$ 118,193	$ 97,005
Securities:
Taxable	12,472	9,921	8,165
Tax-exempt	2,372	2,739	2,983
Dividends	1,017	1,017	721
Total interest and dividend income	155,728	131,870	108,874
Interest Expense:
Deposits	30,202	17,228	9,312
Borrowed funds	5,349	5,856	4,021
Subordinated debentures (includes $63, $164, and $288 accumulated other comprehensive income reclassification for change in fair value of interest rate swap agreements in 2019, 2018, and 2017, respectively)	3,979	3,866	4,032
Total interest expense	39,530	26,950	17,365
Net Interest Income	116,198	104,920	91,509
Provision for Loan Losses	6,024	6,072	6,655
Net Interest Income After Provision for Loan Losses	110,174	98,848	84,854
Non-Interest Income:
Service charges on deposit accounts	6,402	5,759	4,809
Other service charges and fees	2,930	2,833	2,454
Wealth and asset management fees	4,627	4,172	3,724
Net realized gains on available-for-sale securities (includes $148, $0, and $1,543 accumulated other comprehensive income reclassifications for net realized gains on available-for-sale securities in 2019, 2018, and 2017, respectively)	148	0	1,543
Net realized gains on trading securities	16	151	93
Net unrealized gains (losses) on trading securities	1,872	(602)	788
Realized gains on Visa Class B shares	463	0	0
Mortgage banking	1,412	1,019	906
Bank owned life insurance	1,317	1,408	1,659
Card processing and interchange income	4,641	4,261	3,763
Gain on sale of branch	0	0	536
Other	2,147	1,722	1,160
Total non-interest income	25,975	20,723	21,435
Non-Interest Expenses:
Salaries	35,212	31,323	26,205
Employee benefits (includes $23, $84, and $192 accumulated other comprehensive income reclassifications for net amortization of actuarial losses in 2019, 2018, and 2017, respectively)	11,193	10,533	9,821
Net occupancy expense	11,221	10,281	9,546
Amortization of core deposit intangible	567	898	1,229
Data processing	4,994	4,586	3,944
State and local taxes	3,140	3,441	2,815
Legal, professional and examination fees	2,514	1,851	1,819
Advertising	2,113	2,345	2,243
FDIC insurance	1,252	1,396	1,182
Directors fees and benefits	1,352	885	1,063
Merger costs	170	0	0
Card processing and interchange expenses	2,891	2,834	2,116
Other	10,889	8,969	8,054
Total non-interest expenses	87,508	79,342	70,037
Income Before Income Taxes	48,641	40,229	36,252
Income Tax Expense (includes $13, $(52), and $372 income tax expense reclassification items in 2019, 2018, and 2017, respectively)	8,560	6,510	12,392
Net Income	40,081	33,719	23,860
Other Comprehensive Income (Loss):
Net change in unrealized gains (losses) on available-for-sale securities, net of reclassification and tax	10,732	(4,007)	(1,004)
Change in actuarial gain (loss), for post-employment health care plan, net of amortization and tax	428	386	825
Change in fair value of interest rate swap agreements designated as a cash flow hedge, net of interest and tax	(225)	(32)
Change in fair value of interest rate swap agreements designated as a cash flow hedge, net of interest and tax			194
Total other comprehensive income (loss)	10,935	(3,653)	15
Comprehensive Income	$ 51,016	$ 30,066	$ 23,875
Earnings Per Share:
Basic (in dollars per share)	$ 2.63	$ 2.21	$ 1.57
Diluted (in dollars per share)	$ 2.63	$ 2.21	$ 1.57