Consolidated Balance Sheets - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Assets
Cash and due from banks	$ 56,490	$ 53,263
Interest-bearing deposits in other banks	107,162	61,930
Total cash and cash equivalents	163,652	115,193
Available-for-sale investment securities, at fair value (amortized cost of $932,179 at March 31, 2020 and $929,395 at December 31, 2019) (a)	960,835	936,101
Held-to-maturity investment securities, at amortized cost (fair value of $40,682 at March 31, 2020 and $32,541 at December 31, 2019) (a)(b)	38,738	31,747
Other investment securities	46,924	42,730
Total investment securities (a)(b)	1,046,497	1,010,578
Loans, net of deferred fees and costs (b)	2,911,437	2,873,525
Allowance for credit losses (b)	(42,833)	(21,556)
Net loans (b)	2,868,604	2,851,969
Loans held for sale	2,217	6,499
Bank premises and equipment, net of accumulated depreciation	60,301	61,846
Bank owned life insurance	70,195	69,722
Goodwill	165,805	165,701
Other intangible assets	11,642	11,802
Other assets	80,207	60,855
Total assets	4,469,120	4,354,165
Liabilities
Non-interest-bearing	727,266	671,208
Interest-bearing	2,671,164	2,620,204
Total deposits	3,398,430	3,291,412
Short-term borrowings	259,661	316,977
Long-term borrowings	132,791	83,123
Accrued expenses and other liabilities (b)	94,517	68,260
Total liabilities	3,885,399	3,759,772
Total liabilities and stockholders’ equity	4,469,120	4,354,165
Stockholders’ equity
Preferred stock, no par value, 50,000 shares authorized, no shares issued at March 31, 2020 and December 31, 2019	0	0
Common stock, no par value, 24,000,000 shares authorized, 21,162,702 shares issued at March 31, 2020 and 21,156,143 shares issued at December 31, 2019, including shares held in treasury	420,678	420,876
Retained earnings (b)	175,637	187,149
Accumulated other comprehensive income (loss), net of deferred income taxes	8,252	(1,425)
Treasury stock, at cost, 865,998 shares at March 31, 2020 and 504,182 shares at December 31, 2019	(20,846)	(12,207)
Total stockholders’ equity	583,721	594,393
Liabilities and Equity	4,469,120	4,354,165
Debt Securities, Available-for-sale, Allowance for Credit Loss	0
Debt Securities, Held-to-maturity, Allowance for Credit Loss	6
Off-Balance Sheet, Credit Loss, Liability	2,400
Accounting Standards Update 2016-13 [Member]
Stockholders’ equity
Cumulative Effect on Retained Earnings, Net of Tax	(3,709)
Retained Earnings
Stockholders’ equity
Total stockholders’ equity	175,637	$ 187,149
Retained Earnings | Accounting Standards Update 2016-13 [Member]
Stockholders’ equity
Cumulative Effect on Retained Earnings, Net of Tax	$ (3,709)