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FHLB Advances, Other Borrowings and Junior Subordinated Notes Payable (Composition of Borrowed Funds) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Composition of Borrowed Funds
Borrowed funds	$ 422,943	$ 329,429
Borrowed funds, average balance	$ 360,362	$ 321,740
Borrowed funds, interest rate during period	2.45%	2.87%
Long-term borrowings
Composition of Borrowed Funds
Borrowed funds	$ 260,943	$ 210,929
Short-term borrowings
Composition of Borrowed Funds
Borrowed funds	162,000	118,500
Federal funds purchased
Composition of Borrowed Funds
Borrowed funds	0	0
Borrowed funds, average balance	$ 0	$ 59
Borrowed funds, interest rate during period	0.00%	2.45%
FHLB advances
Composition of Borrowed Funds
Borrowed funds	$ 388,500	$ 295,000
Borrowed funds, average balance	$ 325,929	$ 286,464
Borrowed funds, interest rate during period	1.91%	2.17%
Other borrowings
Composition of Borrowed Funds
Borrowed funds	$ 675	$ 675
Borrowed funds, average balance	$ 675	$ 675
Borrowed funds, interest rate during period	8.09%	8.11%
Subordinated notes payable(1)
Composition of Borrowed Funds
Borrowed funds	$ 23,717	$ 23,707
Borrowed funds, average balance	$ 23,710	$ 24,502
Borrowed funds, interest rate during period	5.95%	7.45%
Junior subordinated notes
Composition of Borrowed Funds
Borrowed funds	$ 10,051	$ 10,047
Borrowed funds, average balance	$ 10,048	$ 10,040
Borrowed funds, interest rate during period	11.04%	11.08%

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