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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands | Total | Hampden Bancorp Inc | Firestone Financial | 44 Business Capital | First Choice Bank | Common stock | Common stock Hampden Bancorp Inc | Common stock Firestone Financial | Common stock 44 Business Capital | Common stock First Choice Bank | Additional paid-in capital | Additional paid-in capital Hampden Bancorp Inc | Additional paid-in capital Firestone Financial | Additional paid-in capital First Choice Bank | Unearned compensation | Retained earnings | Accumulated other comprehensive (loss) income | Treasury stock | [1] | Treasury stock 44 Business Capital | [1]
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Beginning balance (shares) at Dec. 31, 2013 |  |  |  |  |  | 25,036,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance at Dec. 31, 2013 | $ 678,062 |  |  |  |  | $ 265 |  |  |  |  | $ 587,247 |  |  |  | $ (5,563) | $ 141,958 | $ (9,057) | $ (36,788) |
Comprehensive income: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 33,744 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 33,744 |  |  |
Other net comprehensive income (loss) | 15,636 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,636 |  |
Total comprehensive income | 49,380 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends declared | (18,075) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (18,075) |  |  |
Treasury stock purchased (shares) |  |  |  |  |  | (100,000) |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury stock purchased | (2,468) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (2,468) |
Forfeited shares (shares) |  |  |  |  |  | (9,000) |  |  |  |  |  |  |  |  |  |  |  |  |
Forfeited shares | 0 |  |  |  |  |  |  |  |  |  | (3) |  |  |  | 221 |  |  | (218) |
Exercise of stock options (shares) |  |  |  |  |  | 90,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise of stock options | 1,064 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,181) |  | 2,245 |
Restricted stock grants (shares) |  |  |  |  |  | 187,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock grants | 0 |  |  |  |  |  |  |  |  |  | (19) |  |  |  | (4,604) |  |  | 4,623 |
Stock-based compensation | 3,840 |  |  |  |  |  |  |  |  |  | 41 |  |  |  | 3,799 |  |  |  |
Net tax benefit related to stock-based compensation | (1,971) |  |  |  |  |  |  |  |  |  | (1,971) |  |  |  |  |  |  |  |
Other, net (shares) |  |  |  |  |  | (21,000) |  |  |  |  |  |  |  |  |  |  |  |  |
Other, net | (545) |  |  |  |  |  |  |  |  |  | (6) |  |  |  |  |  |  | (539) |
Ending balance (shares) at Dec. 31, 2014 |  |  |  |  |  | 25,183,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Ending balance at Dec. 31, 2014 | 709,287 |  |  |  |  | $ 265 |  |  |  |  | 585,289 |  |  |  | (6,147) | 156,446 | 6,579 | (33,145) |
Comprehensive income: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 49,518 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 49,518 |  |  |
Other net comprehensive income (loss) | (9,884) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (9,884) |  |
Total comprehensive income | 39,634 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued pursuant to acquisition (shares) |  |  |  |  |  |  | 4,186,000 | 1,442,000 |  |  |  |  |  |  |  |  |  |  |
Stock issued pursuant to acquisition |  | $ 114,604 | $ 42,107 |  |  |  | $ 42 | $ 15 |  |  |  | $ 114,562 | $ 42,092 |  |  |  |  |  |
Cash dividends declared | (21,903) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (21,903) |  |  |
Treasury stock purchased (shares) |  |  |  |  |  | (18,000) |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury stock purchased | (550) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (550) |
Forfeited shares (shares) |  |  |  |  |  | (20,000) |  |  |  |  |  |  |  |  |  |  |  |  |
Forfeited shares | 0 |  |  |  |  |  |  |  |  |  | 47 |  |  |  | 509 |  |  | (556) |
Exercise of stock options (shares) |  |  |  |  |  | 16,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise of stock options | 239 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (176) |  | 415 |
Restricted stock grants (shares) |  |  |  |  |  | 226,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock grants | 0 |  |  |  |  |  |  |  |  |  | 440 |  |  |  | (6,029) |  |  | 5,589 |
Stock-based compensation | 4,670 |  |  |  |  |  |  |  |  |  | 0 |  |  |  | 4,670 |  |  |  |
Net tax benefit related to stock-based compensation | 167 |  |  |  |  |  |  |  |  |  | 167 |  |  |  |  |  |  |  |
Other, net (shares) |  |  |  |  |  | (41,000) |  |  |  |  |  |  |  |  |  |  |  |  |
Other, net | (1,066) |  |  |  |  |  |  |  |  |  | 22 |  |  |  |  |  |  | (1,088) |
Ending balance (shares) at Dec. 31, 2015 |  |  |  |  |  | 30,974,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Ending balance at Dec. 31, 2015 | 887,189 |  |  |  |  | $ 322 |  |  |  |  | 742,619 |  |  |  | (6,997) | 183,885 | (3,305) | (29,335) |
Comprehensive income: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 58,670 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 58,670 |  |  |
Other net comprehensive income (loss) | 13,071 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13,071 |  |
Total comprehensive income | 71,741 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued pursuant to acquisition (shares) |  |  |  | 45,000 | 4,400,000 |  |  |  | 45,000 | 4,410,000 |  |  |  |  |  |  |  |  |
Stock issued pursuant to acquisition |  |  |  | $ 1,217 | $ 151,048 |  |  |  |  | $ 44 |  |  |  | $ 151,004 |  |  |  |  | $ 1,217
Cash dividends declared | (24,916) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (24,916) |  |  |
Treasury stock purchased | 0 |  |  |  |  |  |  |  |  |  | 4,632 |  |  |  |  |  |  | (4,632) |
Forfeited shares (shares) |  |  |  |  |  | (70,000) |  |  |  |  |  |  |  |  |  |  |  |  |
Forfeited shares | 0 |  |  |  |  |  |  |  |  |  | 148 |  |  |  | 1,789 |  |  | (1,937) |
Exercise of stock options (shares) |  |  |  |  |  | 151,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise of stock options | 3,712 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (145) |  | 3,857 |
Restricted stock grants (shares) |  |  |  |  |  | 211,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock grants | 0 |  |  |  |  |  |  |  |  |  | 575 |  |  |  | (5,787) |  |  | 5,212 |
Stock-based compensation | 4,621 |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,621 |  |  |  |
Net tax benefit related to stock-based compensation | (1) |  |  |  |  |  |  |  |  |  | (1) |  |  |  |  |  |  |  |
Other, net (shares) |  |  |  |  |  | (48,000) |  |  |  |  |  |  |  |  |  |  |  |  |
Other, net | (1,313) |  |  |  |  |  |  |  |  |  | 12 |  |  |  |  |  |  | (1,325) |
Ending balance (shares) at Dec. 31, 2016 |  |  |  |  |  | 35,673,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Ending balance at Dec. 31, 2016 | $ 1,093,298 |  |  |  |  | $ 366 |  |  |  |  | $ 898,989 |  |  |  | $ (6,374) | $ 217,494 | $ 9,766 | $ (26,943) |
Comprehensive income: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury stock retired (in shares) | 168,931 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Treasury stock adjustment represents the extinguishment of 168,931 shares of Berkshire Hills Bancorp stock held by the Company's subsidiary.

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