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Acquisitions - Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Business Acquisition [Line Items]      
Goodwill $ 244,000 $ 244,000 $ 243,129
Ameriana      
Business Acquisition [Line Items]      
Cash and cash equivalents     4,068
Interest-bearing time deposits     8,790
Investment securities     61,754
Loans     316,929
Premises and equipment     13,946
Federal Home Loan Bank stock     2,693
Other real estate owned     5,613
Interest receivable     1,306
Cash surrender value of life insurance     28,188
Other assets     6,713
Deposits     (383,718)
Interest payable     (24)
Federal Home Loan Bank Advances     (24,884)
Subordinated debentures     (5,487)
Other liabilities     (9,451)
Net tangible assets acquired     26,436
Core deposit intangible     5,342
Goodwill     38,624
Purchase price     $ 70,402