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Consolidated Statements of Equity - USD ($) $ in Thousands | Total | Dividend paid | Dividend declared | Series D Cumulative Redeemable Preferred Stock | Series D Cumulative Redeemable Preferred Stock Dividend paid | Series D Cumulative Redeemable Preferred Stock Dividend declared | Series C Cumulative Preferred Stock | Series C Cumulative Preferred Stock Dividend paid | Series C Cumulative Preferred Stock Dividend declared | Preferred Stock | Preferred Stock Series D Cumulative Redeemable Preferred Stock | Preferred Stock Series C Cumulative Preferred Stock | Common Stock | Additional Paid-in Capital | Additional Paid-in Capital Series D Cumulative Redeemable Preferred Stock | Additional Paid-in Capital Series C Cumulative Preferred Stock | Distributions in Excess of Accumulated Earnings | Distributions in Excess of Accumulated Earnings Dividend paid | Distributions in Excess of Accumulated Earnings Dividend declared | Distributions in Excess of Accumulated Earnings Series D Cumulative Redeemable Preferred Stock Dividend paid | Distributions in Excess of Accumulated Earnings Series D Cumulative Redeemable Preferred Stock Dividend declared | Distributions in Excess of Accumulated Earnings Series C Cumulative Preferred Stock | Distributions in Excess of Accumulated Earnings Series C Cumulative Preferred Stock Dividend paid | Distributions in Excess of Accumulated Earnings Series C Cumulative Preferred Stock Dividend declared | Accumulated Other Comprehensive (Loss) | Total Saul Centers, Inc. | Total Saul Centers, Inc. Dividend paid | Total Saul Centers, Inc. Dividend declared | Total Saul Centers, Inc. Series D Cumulative Redeemable Preferred Stock | Total Saul Centers, Inc. Series D Cumulative Redeemable Preferred Stock Dividend paid | Total Saul Centers, Inc. Series D Cumulative Redeemable Preferred Stock Dividend declared | Total Saul Centers, Inc. Series C Cumulative Preferred Stock | Total Saul Centers, Inc. Series C Cumulative Preferred Stock Dividend paid | Total Saul Centers, Inc. Series C Cumulative Preferred Stock Dividend declared | Noncontrolling Interests | Noncontrolling Interests Dividend paid | Noncontrolling Interests Dividend declared
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Beginning balance at Dec. 31, 2015 | $ 353,727 |  |  |  |  |  |  |  |  | $ 180,000 |  |  | $ 213 | $ 305,008 |  |  | $ (180,091) |  |  |  |  |  |  |  | $ (1,802) | $ 303,328 |  |  |  |  |  |  |  |  | $ 50,399 |  |
Issuance of common stock: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued pursuant to dividend reinvestment plan | 10,311 |  |  |  |  |  |  |  |  |  |  |  | 2 | 10,309 |  |  |  |  |  |  |  |  |  |  |  | 10,311 |  |  |  |  |  |  |  |  |  |  |
Shares issued due to exercise of employee stock options and issuance of directors' deferred stock | 12,856 |  |  |  |  |  |  |  |  |  |  |  | 2 | 12,854 |  |  |  |  |  |  |  |  |  |  |  | 12,856 |  |  |  |  |  |  |  |  |  |  |
Issuance of partnership units pursuant to dividend reinvestment plan | 6,910 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,910 |  |
Net income | 56,720 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 45,279 |  |  |  |  |  |  |  |  | 45,279 |  |  |  |  |  |  |  |  | 11,441 |  |
Change in unrealized loss on cash flow hedge | 678 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 503 | 503 |  |  |  |  |  |  |  |  | 175 |  |
Preferred stock distributions: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock distributions |  |  |  |  |  |  |  | $ (9,282) | $ (3,093) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (9,282) | $ (3,093) |  |  |  |  |  |  |  |  | $ (9,282) | $ (3,093) |  |  |
Common stock distributions |  | $ (40,720) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (30,328) |  |  |  |  |  |  |  |  | $ (30,328) |  |  |  |  |  |  |  |  | $ (10,392) |
Distributions payable common stock and distributions payable partnership units |  |  | $ (14,858) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (11,069) |  |  |  |  |  |  |  |  | $ (11,069) |  |  |  |  |  |  |  |  | $ (3,789)
Ending balance at Dec. 31, 2016 | 373,249 |  |  |  |  |  |  |  |  | 180,000 |  |  | 217 | 328,171 |  |  | (188,584) |  |  |  |  |  |  |  | (1,299) | 318,505 |  |  |  |  |  |  |  |  | 54,744 |  |
Issuance of common stock: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued pursuant to dividend reinvestment plan | 15,750 |  |  |  |  |  |  |  |  |  |  |  | 2 | 15,748 |  |  |  |  |  |  |  |  |  |  |  | 15,750 |  |  |  |  |  |  |  |  |  |  |
Shares issued due to exercise of employee stock options and issuance of directors' deferred stock | 8,673 |  |  |  |  |  |  |  |  |  |  |  | 2 | 8,671 |  |  |  |  |  |  |  |  |  |  |  | 8,673 |  |  |  |  |  |  |  |  |  |  |
Issuance of partnership units pursuant to dividend reinvestment plan | 6,735 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,735 |  |
Net income | 60,668 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 48,257 |  |  |  |  |  |  |  |  | 48,257 |  |  |  |  |  |  |  |  | 12,411 |  |
Change in unrealized loss on cash flow hedge | 812 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 603 | 603 |  |  |  |  |  |  |  |  | 209 |  |
Preferred stock distributions: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock distributions |  |  |  |  |  |  |  | (9,282) | (3,093) |  |  |  |  |  |  |  |  |  |  |  |  |  | (9,282) | (3,093) |  |  |  |  |  |  |  |  | (9,282) | (3,093) |  |  |
Common stock distributions |  | (44,969) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (33,490) |  |  |  |  |  |  |  |  | (33,490) |  |  |  |  |  |  |  |  | (11,479) |
Distributions payable common stock and distributions payable partnership units |  |  | (15,440) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (11,518) |  |  |  |  |  |  |  |  | (11,518) |  |  |  |  |  |  |  |  | (3,922)
Ending balance at Dec. 31, 2017 | 393,103 |  |  |  |  |  |  |  |  | 180,000 |  |  | 221 | 352,590 |  |  | (197,710) |  |  |  |  |  |  |  | (696) | 334,405 |  |  |  |  |  |  |  |  | 58,698 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of Series D Cumulative preferred stock |  |  |  | $ 72,367 |  |  |  |  |  |  | $ 75,000 |  |  |  | $ (2,633) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 72,367 |  |  |  |  |  |  |  |
Redemption of Series of Series C Cumulative preferred stock |  |  |  |  |  |  | $ (75,017) |  |  |  |  | $ (75,000) |  |  |  | $ 2,311 |  |  |  |  |  | $ (2,328) |  |  |  |  |  |  |  |  |  | $ (75,017) |  |  |  |  |
Issuance of common stock: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued pursuant to dividend reinvestment plan | 28,823 |  |  |  |  |  |  |  |  |  |  |  | 6 | 28,817 |  |  |  |  |  |  |  |  |  |  |  | 28,823 |  |  |  |  |  |  |  |  |  |  |
Shares issued due to exercise of employee stock options and issuance of directors' deferred stock | 3,448 |  |  |  |  |  |  |  |  |  |  |  |  | 3,448 |  |  |  |  |  |  |  |  |  |  |  | 3,448 |  |  |  |  |  |  |  |  |  |  |
Issuance of partnership units pursuant to dividend reinvestment plan | 14,159 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14,159 |  |
Net income | 63,059 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50,554 |  |  |  |  |  |  |  |  | 50,554 |  |  |  |  |  |  |  |  | 12,505 |  |
Change in unrealized loss on cash flow hedge | 594 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 441 | 441 |  |  |  |  |  |  |  |  | 153 |  |
Preferred stock distributions: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock distributions |  |  |  |  | $ (3,164) | $ (1,148) |  | $ (6,145) | $ (1,805) |  |  |  |  |  |  |  |  |  |  | $ (3,164) | $ (1,148) |  | $ (6,145) | $ (1,805) |  |  |  |  |  | $ (3,164) | $ (1,148) |  | $ (6,145) | $ (1,805) |  |  |
Common stock distributions |  | $ (46,900) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (34,841) |  |  |  |  |  |  |  |  | $ (34,841) |  |  |  |  |  |  |  |  | $ (12,059) |
Distributions payable common stock and distributions payable partnership units |  |  | $ (16,154) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (12,006) |  |  |  |  |  |  |  |  | $ (12,006) |  |  |  |  |  |  |  |  | $ (4,148)
Ending balance at Dec. 31, 2018 | $ 425,220 |  |  |  |  |  |  |  |  | $ 180,000 |  |  | $ 227 | $ 384,533 |  |  | $ (208,593) |  |  |  |  |  |  |  | $ (255) | $ 355,912 |  |  |  |  |  |  |  |  | $ 69,308 |  |

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- Definition Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4568740-111683 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4I -URI http://asc.fasb.org/extlink&oid=84234705&loc=SL4590271-111686 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4568447-111683 + Details
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Data Type: | xbrli:monetaryItemType
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Period Type: | instant