Borrowed Funds and Subordinated Debentures - Schedule of Debt (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Long-term Debt	$ 293,310
FHLB borrowings and repurchase agreements:
Debt Instrument [Line Items]
Borrowed funds at December 31	283,000	$ 210,000	$ 260,000
Year-to-date average	103,201	121,970	110,420
Maximum outstanding	$ 283,000	$ 238,000	$ 260,000
Rate at December 31	1.74%	2.31%	1.59%
Long-term Debt	$ 283,000
Rate year-to-date average	1.85%	1.78%	1.75%
Repurchase agreements:
Debt Instrument [Line Items]
Year-to-date average	$ 0	$ 2,384	$ 15,000
Maximum outstanding	$ 0	$ 15,000	$ 15,000
Rate at December 31	0.00%	0.00%	3.67%
Long-term Debt	$ 0	$ 0	$ 15,000
Rate year-to-date average	0.00%	3.67%	3.67%
Subordinated debentures:
Debt Instrument [Line Items]
Year-to-date average	$ 10,310	$ 10,310	$ 10,310
Maximum outstanding	$ 10,310	$ 10,310	$ 10,310
Rate at December 31	3.33%	2.40%	2.40%
Long-term Debt	$ 10,310	$ 10,310	$ 10,310
Rate year-to-date average	3.50%	2.40%	2.40%