Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash Flows From Operating Activities:
Net income	$ 32,743	$ 40,081	$ 33,719
Adjustments to reconcile net income to net cash provided by operations:
Provision for loan losses	15,354	6,024	6,072
Depreciation and amortization of premises and equipment, operating leases assets, core deposit intangible, and mortgage servicing rights	6,082	5,963	4,811
Amortization and accretion of securities premiums and discounts, deferred loan fees and costs, net yield and credit mark on acquired loans, and unearned income	(1,955)	(870)	(537)
Amortization and accretion of deferred PPP processing fees	(5,140)	0	0
Deferred taxes	1,390	(204)	(1,076)
Net realized gains on sales of available-for-sale securities	(2,190)	(148)	0
Net realized and unrealized losses (gains) on trading securities	(328)	(1,888)	451
Proceeds from sale of Visa Class B shares	0	463	0
Gain on sale of Visa Class B shares	0	(463)	0
Gain on sale of loans	(2,961)	(990)	(624)
Net losses (gains) on dispositions of premises and equipment and foreclosed assets	1,097	(377)	47
Proceeds from sale of loans	82,619	43,198	23,311
Origination of loans held for sale	(87,528)	(43,458)	(22,990)
Income on bank owned life insurance, including death benefit of proceeds in excess of cash surrender value	(1,747)	(1,317)	(1,408)
Stock-based compensation expense	1,410	1,346	1,545
Changes in:
Accrued interest receivable and other assets	(6,242)	1,072	(3,079)
Accrued interest payable, lease liabilities, and other liabilities	(3,846)	3,610	4,613
Net Cash Provided By Operating Activities	28,758	52,042	44,855
Cash Flows from Investing Activities:
Proceeds from maturities, prepayments and calls of available-for-sale securities	164,488	98,274	76,349
Proceeds from sales of available-for-sale securities	57,185	11,403	0
Proceeds from sale of trading securities	5,935	301	455
Purchase of available-for-sale securities	(224,080)	(122,358)	(189,374)
Purchase of trading securities	(2,447)	(436)	(1,542)
Loan origination and payments, net	(244,903)	(335,965)	(333,552)
Purchase of bank owned life insurance	0	(8,778)	0
Net cash from business combinations	72,852	0	0
Repayment (purchase) of FHLB and other equity interests	7,268	(3,360)	(2,991)
Purchase of premises and equipment	(5,644)	(9,045)	(3,068)
Proceeds from the sale of premises and equipment and foreclosed assets	666	1,228	1,048
Net Cash Used In Investing Activities	(168,680)	(368,736)	(452,675)
Net change in:
Checking, money market and savings accounts	702,452	459,162	412,505
Certificates of deposit	(42,510)	32,379	30,466
Deposits held for sale	0	0	0
Purchase of treasury stock	(1,307)	(1,291)	(2,454)
Proceeds from stock offering, net of issuance costs	3,257	1,423	0
Proceeds from preferred stock offering, net of issuance costs	57,785	0	0
Cash dividends paid on common stock	(10,981)	(10,358)	(10,237)
Cash dividends paid on preferred stock	(1,147)	0	0
Proceeds from long-term borrowings	231,985	30,353	50,000
Repayments on long-term borrowings	(459,892)	(47,563)	(27,826)
Net change in short-term borrowings	0	0	(34,416)
Net Cash Provided By Financing Activities	479,642	464,105	418,038
Net Increase in Cash and Cash Equivalents	339,720	147,411	10,218
Cash and Cash Equivalents, Beginning	192,974	45,563	35,345
Cash and Cash Equivalents, Ending	532,694	192,974	45,563
Cash paid during the period for:
Interest	32,957	39,282	26,551
Income taxes	9,524	8,006	7,050
Supplemental Noncash Disclosures:
Transfers to other real estate owned	241	2,066	228
Grant of restricted stock awards from treasury stock	934	1,086	996
Grant of performance based restricted stock awards from treasury stock	217	21	0
Restricted stock forfeiture	0	71	11
Right of use assets obtained in exchange for lease liabilities	$ 1,386	$ 19,465	$ 0