Other Intangible Assets (Amortization Expense of Core Deposit Intangible Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Carrying amount, accumulated amortization and amortization expense of core deposit intangible assets
Net carrying amount	$ 40,211	$ 26,982
Core deposit intangible assets
Carrying amount, accumulated amortization and amortization expense of core deposit intangible assets
Gross carrying amount	59,143	40,055
Accumulated amortization	18,932	13,401
Net carrying amount	$ 40,211	$ 26,654