Other Borrowings (Schedule of Other Borrowings) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Long-term debt	$ 274,905	$ 285,011
Advances from the FHLB
Debt Instrument [Line Items]
Long-term debt	$ 3,399	$ 6,702
Weighted average interest rate	4.03%	3.22%
Wholesale repurchase agreements
Debt Instrument [Line Items]
Long-term debt	$ 0	$ 30,000
Trust preferred securities
Debt Instrument [Line Items]
Long-term debt	130,913	121,886
Senior notes
Debt Instrument [Line Items]
Long-term debt	5,000	11,000
Note payable to unaffiliated bank
Debt Instrument [Line Items]
Long-term debt	58,417	33,667
Contracts payable for purchase of real estate and other assets
Debt Instrument [Line Items]
Long-term debt	1,953	1,881
Subordinated notes
Debt Instrument [Line Items]
Long-term debt	74,143	74,000
Other borrowings
Debt Instrument [Line Items]
Long-term debt	$ 1,080	$ 5,875