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Note 8 - Borrowings (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged   $ 1,010,000  
Deposit Liabilities, Collateral Issued, Financial Instruments   $ 77,420  
Unsecured Line of Credit [Member]      
Line of Credit Facility, Interest Rate Description   one-month LIBOR plus 2.00%  
Line of Credit Facility, Expiration Date   Apr. 30, 2018  
Line of Credit Facility, Maximum Borrowing Capacity   $ 15,000  
Debt Instrument, Basis Spread on Variable Rate   2.00%  
Long-term Line of Credit   $ 0 $ 0
Junior Subordinated Debt [Member]      
Debt Instrument, Term 30 years    
Proceeds from Issuance of Subordinated Long-term Debt $ 15,460    
Debt Instrument, Maturity Date Oct. 08, 2033    
Junior Subordinated Debt [Member] | London Interbank Offered Rate (LIBOR) [Member]      
Debt Instrument, Basis Spread on Variable Rate 2.95%    
Federal Home Loan Bank Borrowings [Member]      
Debt Instrument, Unused Borrowing Capacity, Amount   $ 509,230