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Acquisitions Acquired Loans at Fair Value (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
May. 30, 2014
Business Acquisition      
Accretable yield $ (7,042) $ (3,172)  
Midwest Bancshares, Inc. | Acquired Nonimpaired Loans      
Business Acquisition      
Contractual cash flows     $ 497,451
Nonaccretable difference     45,828
Expected cash flows     451,623
Accretable yield     90,346
Fair value     361,277
Midwest Bancshares, Inc. | Acquired Purchased Credit Impaired Loans      
Business Acquisition      
Nonaccretable difference     13,336
Contractual cash flows     40,258
Expected cash flows     26,922
Accretable yield     3,611
Fair value     $ 23,311