Business Combinations (Narrative) (Details) - USD ($)			12 Months Ended
	Oct. 29, 2019	Feb. 28, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Share price		$ 35.70
Goodwill			$ 22,310,000	$ 22,310,000	$ 1,800,000
Universal Bancorp [Member]
Business Acquisition [Line Items]
Business acquisition, percentage of voting interests acquired		100.00%
Business acquisition, effective date of acquisition			Feb. 28, 2018
Business acquisition, name of acquired entity			Universal Bancorp ("Universal")
Business combination acquirer's shares issued per acquiree's single share		15.6
Business combination acquirer cash given per acquiree's single share		$ 250.00
Business acquisition, equity interest issued or issuable, number of shares		1,200,000
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable		$ 42,323,000
Total Loans		252,431,000
Contractual principal amount		257,000,000
Business acquisition, transaction costs		2,400,000	$ 340,000
Core deposit intangible		4,545,000
Goodwill		$ 20,511,000
Finite Lived Intangible Asset Useful Life		15 years
Total purchase price		$ 61,322,000
Credit adjustment		4,600,000
Total consideration		$ 61,322,000
Northwest Bancshares | Merger Agreement
Business Acquisition [Line Items]
Total purchase price	$ 346,000,000
Right to receive number of shares	2.4
Total consideration	$ 346,000,000