Federal Funds Purchased and Securities Sold Under Agreements to Repurchase (Tables)

12 Months Ended

Dec. 31, 2017

Federal Funds Purchased and Securities Sold under Agreements to Repurchase [Abstract]

Schedule of Short-term Debt [Table Text Block]

	Federal Funds Purchased			Securities Sold  Under Agreements to Repurchase
	(In thousands)
2017
Outstanding at end of year	$	30,000		$	32,169
Maximum outstanding at any month-end	100,000			67,249
Average balance for the year	22,742			58,872
Weighted average rate at end of year	1.50		%	0.09		%
Weighted average rate paid for the year	1.19		%	0.09		%
2016
Outstanding at end of year	$	80,000		$	59,624
Maximum outstanding at any month-end	180,000			77,466
Average balance for the year	29,542			66,282
Weighted average rate at end of year	0.75		%	0.05		%
Weighted average rate paid for the year	0.54		%	0.05		%
2015
Outstanding at end of year	$	—		$	58,215
Maximum outstanding at any month-end	102,000			75,313
Average balance for the year	10,008			64,320
Weighted average rate at end of year	—		%	0.05		%
Weighted average rate paid for the year	0.31		%	0.05		%