Goodwill, Core Deposit Intangibles and Other Intangible Assets (Carrying Amount of Intangible Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 112,836	$ 133,879
Accumulated Amortization	57,412	55,328
Net Carrying Amount	55,424	78,551
Core Deposit Intangibles
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	96,821	83,640
Accumulated Amortization	48,338	36,403
Net Carrying Amount	48,483	47,237
Customer Relationship Intangible
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,177	1,177
Accumulated Amortization	972	935
Net Carrying Amount	205	242
Mortgage Servicing Rights
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	7,886	42,228
Accumulated Amortization	2,265	12,865
Net Carrying Amount	5,621	29,363
Commercial Servicing Rights
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	6,952	6,834
Accumulated Amortization	5,837	5,125
Net Carrying Amount	$ 1,115	$ 1,709