Fair Value of Assets and Liabilities (Summary of Changes in Level Three Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015		Dec. 31, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance		$ 8,435
Ending Balance				$ 8,435
Mortgage Servicing Rights
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance		8,435		8,946
Total net gains (losses) included in Net income		657	[1]	(1,214)	[2]
Purchases				703
Issuances		0
Sales		0
Ending Balance		9,092		8,435
Municipal
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance		58,953		36,386
Total net gains (losses) included in Other comprehensive income		(1,198)		202
Purchases		33,998		27,437
Issuances		0
Sales		0
Settlements		(23,140)		(13,954)
Net transfers into (out of) Level 3	[3]			8,882
Ending Balance		68,613		58,953
Equity securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance		23,711		22,163
Total net gains (losses) included in Other comprehensive income		1,488		1,548
Issuances		0
Sales		0
Ending Balance		$ 25,199		$ 23,711

[1] Changes in the balance of mortgage servicing rights are recorded as a component of mortgage banking revenue in non-interest income.

[2] Changes in the balance of mortgage servicing rights are recorded as a component of mortgage banking revenue in non-interest income.

[3] Transfers into Level 3 relate to a reclassification of municipal bonds in the third quarter of 2014.