Loans Loans (Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period) (Details) - Delavan Bancshares $ in Thousands		Jan. 16, 2015 USD ($)
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Contractually required payments including interest		$ 15,791
Less: Nonaccretable difference		1,442
Cash flows expected to be collected	[1]	14,349
Less: Accretable yield		898
Fair value of PCI loans acquired		$ 13,451

[1] Represents undiscounted expected principal and interest cash at acquisition.