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Other borrowings	12 Months Ended
Other borrowings	Dec. 31, 2016
Debt Disclosure [Abstract]
Other borrowings	Other borrowings The Bank is a member of the FHLB Des Moines. As a member, the Bank has a committed borrowing line of credit up to 35% of total assets, subject to the Bank pledging sufficient collateral and maintaining the required investment in FHLB stock. At December 31, 2016 and 2015, the Bank had no outstanding borrowings under the committed lines of credit. All outstanding borrowings and letters of credit with the FHLB are collateralized by a blanket pledge agreement on the Bank’s FHLB stock, any funds on deposit with the FHLB, certain investment securities, and certain loans. At December 31, 2016, the Bank had available borrowings with the FHLB of approximately $644.7 million, based on eligible collateral. There can be no assurance that future advances will be allowed by the FHLB. At December 31, 2016, the Bank had no borrowings outstanding with the FRB and had approximately $16.1 million in available short-term borrowings at FRB, collateralized by certain of the Bank’s securities. As an additional source of liquidity, the Bank has federal fund borrowing agreements with correspondent banks aggregating approximately $90.0 million at December 31, 2016. At December 31, 2016, the Company had no outstanding borrowings under these federal fund borrowing agreements.