Schedule of Loans Renegotiated in Troubled Debt Restructurings (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016 USD ($) notes	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) notes	Sep. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Loans Renegotiated in Troubled Debt Restructurings	$ 44,704		$ 44,704		$ 40,330
Loans Renegotiated in Troubled Debt Restructurings, Non-Accrual Loans	27,541		27,541		24,911
Loans Renegotiated in Troubled Debt Restructurings, Accrual Loans	$ 17,163		$ 17,163		$ 15,419
Number of Notes | notes	6		23
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 2,009		$ 11,311
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	$ 0	$ 0	$ 0	$ 0
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | notes	0		1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0		$ 194
Loans and Leases Receivable, Impaired, Commitment to Lend	0		0
Interest only period
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Pre-Modification Recorded Investment	0		4,929
Extension of terms or maturity
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Pre-Modification Recorded Investment	1,026		2,298
Interest Rate Adjustment Concession [Member]
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Pre-Modification Recorded Investment	0		46
Other Concession [Member]
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 983		$ 4,038
Commercial real estate
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Number of Notes | notes	4		11
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 1,824		$ 3,088
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | notes	0		1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0		$ 194
Commercial real estate | Interest only period
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Pre-Modification Recorded Investment	0		689
Commercial real estate | Extension of terms or maturity
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Pre-Modification Recorded Investment	841		1,166
Commercial real estate | Interest Rate Adjustment Concession [Member]
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Pre-Modification Recorded Investment	0		0
Commercial real estate | Other Concession [Member]
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 983		$ 1,233
Residential real estate
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Number of Notes | notes	1		1
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 64		$ 64
Residential real estate | Interest only period
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Pre-Modification Recorded Investment	0		0
Residential real estate | Extension of terms or maturity
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Pre-Modification Recorded Investment	64		64
Residential real estate | Interest Rate Adjustment Concession [Member]
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Pre-Modification Recorded Investment	0		0
Residential real estate | Other Concession [Member]
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 0		$ 0
Commercial
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Number of Notes | notes			10
Financing Receivable, Modifications, Pre-Modification Recorded Investment			$ 8,038
Commercial | Interest only period
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Pre-Modification Recorded Investment			4,240
Commercial | Extension of terms or maturity
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Pre-Modification Recorded Investment			947
Commercial | Interest Rate Adjustment Concession [Member]
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Pre-Modification Recorded Investment			46
Commercial | Other Concession [Member]
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Pre-Modification Recorded Investment			$ 2,805
Agricultural
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Number of Notes | notes	1		1
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 121		$ 121
Agricultural | Interest only period
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Pre-Modification Recorded Investment	0		0
Agricultural | Extension of terms or maturity
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Pre-Modification Recorded Investment	121		121
Agricultural | Interest Rate Adjustment Concession [Member]
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Pre-Modification Recorded Investment	0		0
Agricultural | Other Concession [Member]
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 0		$ 0