Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash Flows From Operating Activities:
Net income	$ 40,081	$ 33,719	$ 23,860
Adjustments to reconcile net income to net cash provided by operations:
Provision for loan losses	6,024	6,072	6,655
Depreciation and amortization of premises and equipment, operating leases assets, core deposit intangible, and mortgage servicing rights	5,963	4,811	5,242
Amortization and accretion of securities premiums and discounts, deferred loan fees and costs, net yield and credit mark on acquired loans, and unearned income	(870)	(537)	(1,202)
Deferred taxes	(204)	(1,076)	3,385
Net realized gains on sales of available-for-sale securities	(148)	0	(1,543)
Net realized and unrealized losses (gains) on trading securities	(1,888)	451	(881)
Proceeds from sale of trading securities	301	455	1,091
Proceeds from sale of Visa Class B shares	463	0	0
Gain on sale of Visa Class B shares	(463)	0	0
Purchase of trading securities	(436)	(1,542)	(2,502)
Gain on sale of branch	0	0	(536)
Gain on sale of loans	(990)	(624)	(545)
Net losses (gains) on dispositions of premises and equipment and foreclosed assets	(377)	47	(107)
Proceeds from sale of loans	43,198	23,311	24,285
Origination of loans held for sale	(43,458)	(22,990)	(25,231)
Income on bank owned life insurance, including death benefit of proceeds in excess of cash surrender value	(1,317)	(1,408)	(1,659)
Stock-based compensation expense	1,346	1,545	928
Changes in:
Accrued interest receivable and other assets	1,072	(3,079)	(1,175)
Accrued interest payable, lease liabilities, and other liabilities	3,610	4,613	698
Net Cash Provided By Operating Activities	51,907	43,768	30,763
Cash Flows from Investing Activities:
Proceeds from maturities, prepayments and calls of available-for-sale securities	98,274	76,349	92,302
Proceeds from sales of available-for-sale securities	11,403	0	16,340
Purchase of available-for-sale securities	(122,358)	(189,374)	(23,689)
Loan origination and payments, net	(335,965)	(333,552)	(273,972)
Purchase of bank owned life insurance	(8,778)	0	(10,000)
Proceeds from death benefit of BOLI policies	0	0	897
Net cash received from sale of branch	0	0	1,079
Purchase of FHLB and other equity interests	(3,360)	(2,991)	(2,331)
Purchase of premises and equipment	(9,045)	(3,068)	(5,215)
Proceeds from the sale of premises and equipment and foreclosed assets	1,228	1,048	938
Net Cash Used In Investing Activities	(368,601)	(451,588)	(203,651)
Net change in:
Checking, money market and savings accounts	459,162	412,505	16,096
Certificates of deposit	32,379	30,466	134,197
Deposits held for sale	0	0	1,079
Purchase of treasury stock	(1,291)	(2,454)	(1,877)
Proceeds from stock offering, net of issuance costs	1,423	0	19,294
Cash dividends paid	(10,358)	(10,237)	(10,094)
Proceeds from long-term borrowings	30,353	50,000	160,000
Repayments on long-term borrowings	(47,563)	(27,826)	(70,092)
Net change in short-term borrowings	0	(34,416)	(69,553)
Net Cash Provided By Financing Activities	464,105	418,038	179,050
Net Increase in Cash and Cash Equivalents	147,411	10,218	6,162
Cash and Cash Equivalents, Beginning	45,563	35,345	29,183
Cash and Cash Equivalents, Ending	192,974	45,563	35,345
Cash paid during the period for:
Interest	39,282	26,551	17,481
Income taxes	8,006	7,050	7,810
Supplemental Noncash Disclosures:
Transfers to other real estate owned	2,066	228	630
Grant of restricted stock awards from treasury stock	1,086	996	984
Grant of performance based restricted stock awards from treasury stock	21	0	0
Restricted stock forfeiture	71	11	67
Right of use assets obtained in exchange for lease liabilities	$ 19,465	$ 0	$ 0