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Financial Instruments With Off-Balance Sheet Risk (Tables)
 12 Months Ended
Dec. 31, 2016
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,
 
2016
 
2015
 
(In thousands)
Commitments to originate loans
 
 
 
Variable rate
$
103,189

 
$
87,622

Fixed rate
65,563

 
17,096

Total commitments to originate new loans
$
168,752

 
$
104,718

Unadvanced portion of loans and unused lines of credit
$
1,280,648

 
$
1,181,114

Standby letters of credit
$
38,391

 
$
39,245

Forward commitments to sell loans
$
9,663

 
$
28,468