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		$ 46,916	$ 65,719	$ 50,543
Provision for credit losses		40,794	8,511	20,310
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of premises and equipment		4,780	5,277	5,581
Net gain on sales of investment securities	[1]	(871)	(54)	(10)
Net gain on mortgage banking activities	[1]	(16,442)	(3,946)	(3,125)
Bank owned life insurance income	[1]	(2,940)	(3,179)	(3,174)
Net amortization of investment securities premiums and discounts		2,594	1,738	1,602
Amortization, fair market value adjustments and capitalization of servicing rights		218	141	(196)
Net amortization (accretion) of acquisition accounting fair value adjustments		42	(761)	(1,037)
Stock-based compensation		1,480	2,348	2,557
Intangible expenses		1,216	1,595	2,166
Other adjustments to reconcile net income to cash (used in) provided by operating activities		(5,485)	(1,635)	305
Deferred tax benefit		(9,854)	(1,807)	(599)
Originations of loans held for sale		(484,842)	(227,083)	(158,097)
Proceeds from the sale of loans held for sale		468,070	227,473	161,357
Contributions to pension and other postretirement benefit plans		(270)	(266)	(3,264)
(Increase) decrease in accrued interest receivable and other assets		(2,835)	(2,332)	4,547
Increase in accrued interest payable and other liabilities		8,608	1,409	6,540
Net cash provided by operating activities		51,179	73,148	86,006
Cash flows from investing activities:
Proceeds from sale of premises and equipment		4	1,410	1,169
Purchases of premises and equipment		(3,753)	(3,856)	(4,288)
Proceeds from maturities, calls and principal repayments of securities held-to-maturity		81,850	34,207	11,526
Proceeds from maturities, calls and principal repayments of securities available-for-sale		54,758	67,020	54,702
Proceeds from sales of securities available-for-sale		66,421	26,494	1,010
Purchases of investment securities held-to-maturity		43,115	84,733	99,132
Purchases of investment securities available-for-sale		(91,273)	(2,993)	(1,986)
Proceeds from sales of money market mutual funds		12,297	5,035	11,225
Purchases of money market mutual funds		(13,139)	(5,413)	(6,482)
Net decrease (increase) in other investments		71	83	(1,133)
Proceeds from sale of loans originally held-for-investment		14,416	0	0
Net increase in loans and leases		(947,204)	(381,343)	(398,240)
Proceeds from sales of other real estate owned		1,275	720	490
Purchases of bank owned life insurance		0	0	(1,563)
Proceeds from bank owned life insurance		0	0	1,384
Net cash used in investing activities		(867,392)	(343,369)	(431,318)
Cash flows from financing activities:
Net increase in deposits		882,625	474,190	331,170
Net (decrease) increase in short-term borrowings		(774)	(171,088)	84,337
Proceeds from issuance of long-term debt		125,000	25,000	10,000
Repayment of long-term debt		(165,000)	(20,000)	(20,000)
Proceeds from issuance of subordinated notes		100,000	0	0
Payments of Debt Issuance Costs		(1,552)	0	0
Repayment of subordinated notes		(10,000)	0	0
Payment of contingent consideration on acquisitions		(121)	(129)	(131)
Purchases of treasury stock		(4,452)	(2,045)	(5,984)
Stock issued under dividend reinvestment and employee stock purchase plans		2,369	2,233	2,295
Proceeds from exercise of stock options		384	1,203	1,131
Cash dividends paid		(17,536)	(23,435)	(23,495)
Net cash provided by financing activities		910,943	285,929	379,323
Net increase in cash and cash equivalents		94,730	15,708	34,011
Cash and cash equivalents at beginning of year		125,128	109,420	75,409
Cash and cash equivalents at end of year		219,858	125,128	109,420
Supplemental disclosures of cash flow information:
Cash paid for interest		29,233	44,479	30,875
Cash paid for income taxes, net of refunds		17,316	17,171	2,022
Non cash transactions:
Transfer of loans to other real estate owned		8,405	71	477
Transfer of loans to loans held for sale		$ 14,416	$ 0	$ 0

[1] Net interest income as well as many other revenues for financial assets and liabilities including loans, leases, securities, and derivatives are excluded from the scope of FASB ASC 606 "Revenue from Contracts with Customers" (FASB ASC 606). Noninterest income streams that are out of scope of FASB ASC 606 include bank owned life insurance income, sales of investment securities and mortgage banking activities.