Long-Term Debt and Other Borrowed Funds (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Dec. 31, 2016	Dec. 31, 2015	Jan. 10, 2008
Debt Instrument
Long-term debt and capital lease obligations		$ 27,970	$ 27,885
Fiscal Year Maturities of Long-term Debt
2015		71
2016		20,077
2017		83
2018		90
2019		97
Thereafter		7,552
Long-term debt and capital lease obligations		27,970	27,885
Debt Instrument, Issuance Date	Jan. 29, 2015
Other borrowings		6	2
Debt Instrument, Maturity Date	Jul. 29, 2022
Parent Company
Debt Instrument
Long-term debt		20,000	20,000
Subordinated Debt | Subordinated Term Loan, 6.81% | Parent Company
Debt Instrument
Long-term debt		$ 20,000	20,000
Fiscal Year Maturities of Long-term Debt
Debt instrument, face amount				$ 20,000
Debt instrument, interest rate, stated percentage		6.81%		6.81%
Subordinated Debt | Subordinated Term Loan, Variable Rate | Subsidiaries
Fiscal Year Maturities of Long-term Debt
Debt instrument, interest rate at period end		2.24%
Subordinated Debt | Note Payable, 6.24% | Parent Company
Fiscal Year Maturities of Long-term Debt
Debt instrument, interest rate, stated percentage				6.24%
Capital Lease Obligations | Capital Lease Obligation, 8.00% | Subsidiaries
Debt Instrument
Capital Lease Obligations		$ 1,517	1,582
Fiscal Year Maturities of Long-term Debt
Debt instrument, interest rate, stated percentage		8.00%
Federal Home Loan Bank | Notes Payable to FHLB | Subsidiaries
Fiscal Year Maturities of Long-term Debt
FHLB, advances, maximum amount available		$ 805,676
Federal Funds Purchased
Fiscal Year Maturities of Long-term Debt
Line of credit facility, maximum borrowing capacity		165,000
Federal Reserve Bank Advances
Fiscal Year Maturities of Long-term Debt
Line of credit facility, maximum borrowing capacity		472,925
Notes Payable, Other Payables [Member] | Note Payable, 6.24% | Subsidiaries
Debt Instrument
Long-term debt			1,343
Fiscal Year Maturities of Long-term Debt
Debt instrument, face amount		1,493
Notes Payable, Other Payables [Member] | Note Payable, 2.24% | Subsidiaries
Debt Instrument
Long-term debt		$ 4,960	$ 4,960
Secured Debt [Member]
Fiscal Year Maturities of Long-term Debt
Debt instrument, face amount	$ 4,960
Debt instrument, interest rate, stated percentage	2.28%
Noncontrolling Interest, Ownership Percentage by Parent	99.90%