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Financial Instruments With Off-Balance Sheet Risk (Tables)
 12 Months Ended
Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Fair Value, Off-balance Sheet Risks [Table Text Block]
Financial instruments with off-balance sheet risk are summarized as follows:
 
December 31,
 
2017
 
2016
 
(In thousands)
Commitments to originate loans
 
 
 
Variable rate
$
56,410

 
$
103,189

Fixed rate
79,784

 
65,563

Total commitments to originate new loans
$
136,194

 
$
168,752

Unadvanced portion of loans and unused lines of credit
$
1,327,140

 
$
1,280,648

Standby letters of credit
$
46,291

 
$
38,391

Forward commitments to sell loans
$
16,886

 
$
9,663