Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
ASSETS
Cash and due from banks	$ 33,589	$ 47,542
Short-term investments	44,201	42,042
Total cash and cash equivalents	77,790	89,584
Investment securities available-for-sale	498,995	502,793
Investment securities available-for-sale		502,793
Investment securities held-to-maturity (fair value of $87,561 and $112,830, respectively)	86,780	114,776
Equity securities held-for-trading	3,581	4,207
Total investment securities	589,356	621,776
Loans held-for-sale	0	3,247
Total loans and leases	6,737,816	6,303,516
Allowance for loan and lease losses	(61,082)	(58,692)
Net loans and leases	6,676,734	6,244,824
Restricted equity securities	53,818	61,751
Premises and equipment, net of accumulated depreciation of $76,763 and $70,140 respectively	74,350	76,382
Right-of-use asset operating leases	24,876
Deferred tax asset	25,017	21,495
Goodwill	160,427	160,427
Identified intangible assets, net of accumulated amortization of $37,481 and $35,818, respectively	4,423	6,086
Other real estate owned (OREO) and repossessed assets, net	2,631	4,019
Other assets	167,431	103,214
Total assets	7,856,853	7,392,805
Non-interest-bearing deposits:
Demand checking accounts	1,141,578	1,033,551
Interest-bearing deposits:
NOW accounts	371,380	336,317
Savings accounts	613,467	619,961
Money market accounts	1,682,005	1,675,050
Certificate of deposit accounts	2,021,642	1,789,165
Total interest-bearing deposits	4,688,494	4,420,493
Total deposits	5,830,072	5,454,044
Borrowed funds:
Advances from the Federal Home Loan Bank of Boston (FHLBB)	758,469	784,375
Subordinated debentures and notes	83,591	83,433
Other borrowed funds	60,689	52,734
Total borrowed funds	902,749	920,542
Operating lease liabilities	24,876
Mortgagors' escrow accounts	7,232	7,426
Accrued expenses and other liabilities	146,318	100,174
Total liabilities	6,911,247	6,482,186
Commitments and contingencies
Brookline Bancorp, Inc. stockholders' equity:
Common stock, $0.01 par value; 200,000,000 shares authorized; 85,177,172 shares issued and 85,177,172 shares issued, respectively	852	852
Additional paid-in capital	736,601	755,629
Retained earnings, partially restricted	265,376	212,838
Accumulated other comprehensive loss	2,283	(9,460)
Treasury stock, at cost; 5,003,127 shares and 5,020,025 shares, respectively	(59,073)	(59,120)
Unallocated common stock held by ESOP; 79,548 shares and 109,950 shares, respectively	(433)	(599)
Total Brookline Bancorp, Inc. stockholders' equity	945,606	900,140
Noncontrolling interest in subsidiary	0	10,479
Total stockholders' equity	945,606	910,619
Total liabilities and stockholders' equity	7,856,853	7,392,805
Commercial real estate loans
ASSETS
Total loans and leases	3,669,222	3,351,736
Commercial loans and leases
ASSETS
Total loans and leases	1,838,748	1,768,958
Consumer loans
ASSETS
Total loans and leases	$ 1,229,846	$ 1,182,822