ACQUISITIONSn - Baylake Corporation Acquisition (Details) - USD ($) $ in Thousands	Apr. 29, 2016	Dec. 31, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Cash, cash equivalents and securities available for sale	$ 263,000
Loans	691,000
Other real estate owned	1,000
Core deposit intangible	17,000
Fixed assets and other assets	63,000
Total assets acquired	1,035,000
Deposits	822,000
Junior subordinated debentures, borrowings and other liabilities	115,000
Total liabilities acquired	937,000
Excess of assets acquired over liabilities acquired	98,000
Less: purchase price	164,000
Goodwill	66,000	$ 107,366	$ 107,366
Fair Value Adjustments
Business Acquisition [Line Items]
Cash, cash equivalents and securities available for sale	1,000
Loans	(19,000)
Other real estate owned	(2,000)
Core deposit intangible	16,000
Fixed assets and other assets	(8,000)
Total assets acquired	(12,000)
Deposits	0
Junior subordinated debentures, borrowings and other liabilities	(1,000)
Total liabilities acquired	(1,000)
Excess of assets acquired over liabilities acquired	(11,000)
As recorded by Baylake Corp
Business Acquisition [Line Items]
Cash, cash equivalents and securities available for sale	262,000
Loans	710,000
Other real estate owned	3,000
Core deposit intangible	1,000
Fixed assets and other assets	71,000
Total assets acquired	1,047,000
Deposits	822,000
Junior subordinated debentures, borrowings and other liabilities	116,000
Total liabilities acquired	938,000
Excess of assets acquired over liabilities acquired	$ 109,000